Ryuta Yagi　　　　　CV

 

 

Graduated Tsukuba Univ. High School (1983)

B.A.   1988  Department of Pure and Applied Science, Faculty of Arts and Science, University of Tokyo.

M.S.    1990   Department of Pure and Applied Science,  Faculty of Science, University of Tokyo

Ph. D  1993   Department of Physics, Faculty of Science, University of Tokyo

 

Assistant Professor   (1993-1999)　　Department of Physics, Faculty of Scienc, University of Tokyo

Postdoctorial Fellow (1999-2000)  Institute for Solid State Physics, University of Tokyo

Associate Professor (Group Leader) (2000-2002)  Cryogenic Center, Hiroshima Univesity

                                                                (2003-)       Graduate School of Advanced Sciences of Matter, Hiroshima University. 

The most significant scientific achievements

  1. Semicalssical interpretation of the angular dependent magnetoresistance oscillations in quasi two-dimensional systems

  2. Prediction of the commensurabiliy magnetoresistance in two-dimensional electron system subjected to periodic mangetic fields

  3. Environmental effect on superconductor-insulator transisitions in ultra small Josephson junctions.

  4. Investigations on the low-energy band structure in graphene. 

Scientific Papers

Under Review

 

[i] Ryoya Ebisuoka1, Takushi Oka1, Shingo Tajima1, Taiki Hirahara1, Tomoaki Nakasuga1, Kenji Watanabe2, Takashi Taniguchi2, and Ryuta Yagi1 Magnetic xxxxxxxxxxxxxxxxxxxxxx  in Moiré Superlattice of h-BN-bilayer Graphene Heterostructures, submitted, (Under Review).  Comming Soon. Preprint is available if requested.

 

Published & Accepted   (Copies of published papers are available if requested.)

                                               

[R63]  Fumiya Mukai, Kota Horii, Nazuna Hata, Ryoya Ebisuoka, Kenji Watanabe, Takashi Taniguchi and Ryuta Yagi,On dielectric screening in twisted double bilayer graphene, J. Phys. Soc. Jpn. 90, 1024702 (2021). Paper of editor’s choice

[R62]  Fumiya Mukai, Kota Horii, Ryoya Ebisuoka, Kenji Watanabe, Takashi Taniguchi and Ryuta Yagi, Unconventional satellite resistance peaks in moire superlattice of hBN/AB-stacked tetralayer graphene heterostructures, Commun. Phys. 4, 109 (2021).

[R61] Shingo Tajima, Ryoya Ebisuoka, Kenji Watanabe, Takashi Taniguchi and Ryuta Yagi.

Multiband ballistic transport and anisotropic commensurability magnetoresistance in antidot lattices of AB-stacked trilayer graphene, J. Phys. Soc. Jpn 89, 044703 (2020).  DOI:10.7566/JPSJ.89.04470

 

[R60] Kota Horii, Tomoaki Nakasuga, Taiki Hirahara, Shingo Tajima, Ryoya Ebisuoka, Kenji Watanabe, Takashi Taniguchi, and Ryuta Yagi,

"Magnetotransport study of the mini-Dirac cone in AB-stacked four- to six-layer graphene under perpendicular electric field",

 Phys. Rev. B 100 245420 (2019).

[R59] Tomoaki Nakasuga, Shingo Tajima, Taiki Hirahara, Ryoya Ebisuoka, Takushi Oka, Kenji Watanabe, Takashi Taniguchi and Ryuta Yagi

"Low energy band structure in Bernal stacked hexlayer graphene: Landau fan diagram and resistance ridge ",

 Phys. Rev. B 99, 085404 (2019). DOI: 10.1103/PhysRevB.99.085404.

[R58] Takushi Oka, Shingo Tajima, Ryoya Ebisuoka, Taiki Hirahara, Kenji Watanabe, Takashi Taniguchi, and Ryuta Yagi, Ballistic transport experiment detects Fermi surface anisotropy of graphene,

Phys. Rev. B 99, 035440 (2019). DOI: 10.1103/PhysRevB.99.035440.

 

[R57] Taiki Hirahara, Ryoya Ebisuoka, Takushi Oka, Tomoaki Nakasuga, Shingo Tajima, Kenji Watanabe, Takashi Taniguchi and Ryuta Yagi, 

”Multilayer graphene shows intrinsic resistance peaks in the carrier density dependence. ”,

 Sci. Rep. 8 13992 (2018). DOI: 10.1038/s41598-018-32214-7

 

[R56] Ryuta Yagi, Taiki Hirahara, Ryoya Ebisuoka, Tomoaki Nakasuga, Shingo Tajima, Kenji Watanabe, and Takashi Taniguchi ,

 "Low-energy band structure and even-odd layer number effect in AB-stacked multilayer graphene",

Sci. Rep. 8 13018 (2018). DOI:10.1038/s41598-018-31291-y

 

[R55] T. Hirahara, R. Ebisuoka, K. Watanabe, T. Taniguchi and R. Yagi,

"Magnetoresistance measurements of tetralayer graphene device with single gate electrode",

J. Phys. Conf. Ser. 969, 012150 (2018). DOI :10.1088/1742-6596/969/1/012150

 

[R54] R. Yagi, R. Sakakibara, R. Ebisuoka, J. Onishi,  K. Watanabe, T. Taniguchi and Y. Iye,  

 “Ballistic transport in graphene antidot lattices”,

Phys. Rev. B 92, 195406 (2015).DOI: 10.1103/PhysRevB.92.195406　

 

[R53] R. Yagi and A. Endo,

“Electric Transport of Graphene Subjected to Modulated Structures”  J. Phys. Soc. Jpn 84, 212008 1-9 (2015).   -----invited review-------DOI:10.7566/JPSJ.84.121008

 

[R52] Seiya Fukada, Yumi Shintani, Midori Shimomura, Fumiya Tahara and Ryuta Yagi,

 “Graphene made by mechanical exfoliation of graphite intercalation compound”,  Jpn. J. Appl. Phys.  51, 085101 (2012).DOI: 10.1143/JJAP.51.085101

 

[R51] Ryuta Yagi, Midori Shimomura, Fumiya Tahara, Hiroaki Kobara, and Seiya Fukada,

“Observing Altshuler-Aronov-Spivak (AAS) oscillation in a hexagonal antidot array of monolayer graphene”

J. Phys. Soc Jpn. 81, 063707 (2012). DOI: 10.1143/JPSJ.81.063707

 

[R50] Kazuki Tsuboi and Ryuta Yagi,

"Effect of magnetic field on charge imbalance relaxation of Non-Equilibrium superconductivity", Physica C 470, S877-S878 (2010).DOI: 10.1016/j.physc.2009.11.088

 

[R49] . Ryuta Yagi, Seiya Fukada, Hiroaki Kobara, Yumi Shintani, Norio Ogita and Masayuki Udagawa,

"Magnetoresistance oscillation at charge neutrality point in monolayer graphene due to potential fluctuation"

J. of Phys. Conf. Ser. 232, 012013 (2010). 10.1088/1742-6596/232/1/012013

 

[R48]  Ryuta Yagi, Seiya Fukada, Hiroaki Kobara, Norio Ogita and Masayuki Udagawa,

"Negtive magnetoresistance due to charge fluctuation in mono-layer graphene in magnetic field",

Physica E 42 673-676(2010),     4pages  DOI: 10.1016/j.physe.2009.12.001

 

 [R47]  Kazuki Tsuboi and Ryuta Yagi,

"Charge Imbalance Relaxation Due to Pair Breaking Perturbation by magnetic field.", J. Phys. Soc. Jpn. 79, 013704 (2010).DOI: 10.1143/JPSJ.79.013704

 

 [R46]  R. Yagi, K. Tsuboi, R. Morimoto, T. Matsumura H. Kobara,

"Study of Quasi-Particle Recombination Rate by Injection Experiment Using Narrow Superconducting Wire and dc-SQUID Junctions, J. Phys. Soc. Jpn. 78, 54704 (2009).  DOI: 10.1143/JPSJ.78.054704

 

[R45]   R. Yagi, K. Utsunomiya, K. Tsuboi, T. Kubota, Y. Terao and Y. Ikebuchi, “Tunneling Measurements of charge imbalance of non-equilibrium superconductors”, Controlable Quantum States, pp.3-8, World Scientific, Singapore, 2008.

 

[R44]  K. Utsunomiya, K. Tsuboi, T. Kubota and R. Yagi,  “Josephson Junction with Tunable Damping using Quasi-particle Injection”, Controlable Quantum States, pp.59-64,  World Scientific, Singapore, 2008.

 

[R43]  R. Yagi,

 "Observation of Charge Imbalance in Voltage Biased Superconductor-Insulator-Normal Tunnel Junctions"

Phys. Rev. B 73, 134507- (2006).DOI: 10.1103/PhysRevB.73.134507

 

[R42] K. Utsunomiya and R. Yagi, “Control of Profile of Josephoson Junction by Quasi-Particle Injection“,

Physica B, 383, 53-54 (2006).DOI: 10.1016/j.physb.2006.03.053

 

[R41] H. Sera, Y. Ikebuchi and R. Yagi,  “Observation of Non-Equilibrium Superconductivity Using DC-SQUID”,

Physica B, 383, 55-56 (2006). DOI: 10.1016/j.physb.2006.03.054

 

[R40]  Kubota and R. Yagi,  

“Fabrication of Cr/CrOx/Cr SET Transistors”, Physica B, 383, 57-58 (2006).DOI: 10.1016/j.physb.2006.03.055

 

[R39]  R. Yagi,  

“Spatial Decay of Nonequilibrium Quasiparticles in Narrow Superconducting Wires with Injection”,

AIP Conference Proceedings, 850, 1419-1420  (2006).DOI:10.1063/1.2354922

 

[R38]  Kubota and R. Yagi,

“Fabrication of Cr/CrOx/Cr SET Transistors”, AIP Conference Proceedings, 850, 751-752  (2006).DOI:10.1063/1.2355235

 

[R37]  Y. Ikebuchi and R. Yagi ,

“Bias dependence of charge imbalance effect in superconducting narrow wires with superconductor/insulator/normal junctions”, Physica E 22 ( 2004)  757-760. DOI: 10.1016/j.physe.2003.12.120

 

[R36]  R. Yagi,

“Quasi Particle Quasi-particle transport in narrow superconducting wires with superconductor/insulator/normal tunnel junctions”, Superlattices and Microstructures 34 (2003) 263-269. DOI: 10.1016/j.spmi.2004.03.018

 

[R35]  T. Yamaguchi, R. Yagi, A. Kanda, Y. Ootuka, S. Kobayashi

“Phase diagram for two-dimensional arrays of small Josephson junctions with shunt resistors” Physica C, 352 (2001) 181-185. DOI: 10.1016/S0921-4534(00)01720-2

 

[R34]  T. Yamaguchi, R. Yagi, A. Kanda, Y. Ootuka, and S. Kobayashi

“Superconductor-insulator transition in a two-dimensional array of resistively shunted small Josephson junctions”

 Phys. Rev. Lett. 85 (2000) 1974-1977. DOI: 10.1103/PhysRevLett.85.1974

 

[R33]  R. Yagi, S. Kobayashi, and Y. Ootuka

“Superconductor-Insulator Transition in Single Small Josephson Junction with Normal Tunneling Junction and with Ohmic Shunt Resistor”, Physica B 280(2000)416-417.DOI: 10.1016/S0921-4526(99)01797-4

 

[R32]  R. Yagi, S. Kobayashi, and Y. Ootuka:

“Dissipative Phase Transition in Single Small Josephson Junction with Normal Tunneling Junction”

J. Phys. Soc. Jpn. 68 (1999) 1075-1077. DOI: 10.1143/JPSJ.68.1075

 

[R31]  R. Yagi and S. Kobayashi:

"The Effect of Shunt Resistor on Superconductor-Insulator Transition in Single Small Josephson Junctions", 

Solid State Electronics 42 (1998) 1477-1480. DOI: 10.1016/S0038-1101(98)00053-7

 

[R30]  T. Yamaguchi, R. Yagi, S. Kobayashi, and Y. Ootuka:

"Two-Dimensional Arrays of Small Josephson Junctions with Regular and Random Defects",

J. Phys. Soc. Jpn. 66 (1998) 729-731.DOI: 10.1143/JPSJ.67.729

 

[R29]  R. Yagi and S. Kobayashi:

"Tuning of Superconductor-Insulator Transition in Single Small Josephson Junctions with Shunt Resistor",

J. Phys. Soc. Jpn. 66( 1997)3360-3362.DOI: 10.1143/JPSJ.66.3360

 

[R28]  R. Yagi and S. Kobayashi:

"Phase Diagram for Superconductor-Insulator Transition in Single Small Josephson Junction with Shunt Resistor",

J. Phys. Soc. Jpn. 66(1997)3722-3724. DOI:10.1143/JPSJ.66.3722

 

[R27]  H. Kazawa, R. Yagi, K. Ono, Y. Ootuka and S. Kobayashi:

"Chemical Potential Dependence of Resistance of Two-Dimensional Array of Small Tunnel Junctions",

J. Phys. Soc. Jpn. 66(1997)276-277. DOI: 10.1143/JPSJ.66.276

 

[R26]  R. Yagi, T. Yamaguchi, H. Kazawa and S. Kobayashi:

"Study on Superconductor-Insulator Transition in Two-Dimensional Arrays of Small Josephson Junctions",

J. Phys. Soc. Jpn. 66 (1997) 2429-2436. DOI: 10.1143/JPSJ.66.2429

 

[R25]  H. Kazawa, R. Yagi, K. Ono, Y. Ootuka and S. Kobayashi:

"Gate Voltage Dependence of Resistance of Two-Dimensional Array of Small Tunnel Junctions",

Jpn. J. Appl. Phys. 36 (1997) 4020-4021.DOI: 10.1143/JPSJ.66.2429

 

[R24]  R. Yagi, T. Yamaguchi, H. Kazawa, and S. Kobayashi:

"Superconductor-Insulator Transition in Two-Dimensional Network of Josephson Junctions",

J. Phys. Soc. Jpn. 65(1996)36-38. DOI: 10.1143/JPSJ.65.36

 

[R23]  R.Yagi, H. Kazawa, T. Yamaguchi, and S. Kobayashi:

"Meausrement of Self Capacitance via Single Electron Tunneling Transistor",

J. Phys. Soc. Jpn. 65(1996)868-869. DOI:10.1143/JPSJ.65.868

 

[R22]  R. Yagi, T. Yamaguchi, H. Kazawa and S. Kobayashi:

"Capacitance Dependence of Critical Tunneling Resistance for Superconductor-Insulator Transition in Two-Dimensional Network of Josephson Junctions", 

Physica B227 (1996)232-234.DOI: https://doi.org/10.1016/0921-4526(96)00407-3

 

[R21]  R. Yagi, T. Yamaguchi, and S. Kobayashi:

"Effect of Finite System Width in Two-Dimensional Network of Small Tunnel Junctions",

Czech. J. Phys. 46 (1996) 695-696. DOI: 10.1007/BF02583655

 

[R20]  R. Yagi, T. Yamaguchi, H. Kazawa, and S. Kobayashi:

"Phase Diagram for Superconductor-Insulator Transitions in Two-Dimensional Network of Small Tunnel Junctions",

Czech. J. Phys. 46 (1996) 693-694. DOI: 10.1007/BF02583654

 

[R19]  R. Yagi, T. Yamaguchi, and S. Kobayashi:

"Edge Effect in Two-Dimensional Network of Small Josephson Junctions",

J. Phys. Soc. Jpn. 65 (1996) 2365-2366. DOI: 10.1007/BF02583654

 

[R18 ] R. Yagi and S. Kobayashi:

"Charge-Vortex Duality Breaking in Small Tunnel Junction with Finite Width",

J. Phys. Soc. Jpn. 64 (1995) 375-377.DOI: 10.1143/JPSJ.64.375

 

[R17] T. Uchihashi, R. Yagi and S. Kobayashi:

"Spectroscopy of a Single Superconducting Fine Particle using a Scanning Tunneling Microscope",

J. Phys. Soc. Jpn. 64 (1995)1059-1062. DOI: 10.1143/JPSJ.64.1059

 

[R16]  R. Yagi and S. Kobayashi:

"Breakdown of Charge-Vortex Duality in Small Tunnel Junction Arrays with Finite Width",

Jpn. J. Appl. Phys. 34 (1995)4569-4571.DOI: 10.1143/JJAP.34.4569

 

[R15]  Y.Iye, R.Yagi, N.Hanasaki, S.Kagoshima, H.Mori, H.Fujimoto and G. Saito:

"The Origin of Anomalous Angular Dependent Magnetoresistance Oscillation Effect in alpha-(BEDT-TTF)2KHg(SCN)4"

J. Phys. Soc. Jpn. 63 (1994 ) 674-684.DOI: 10.1143/JPSJ.63.674

 

*[R14] T. Kagayama, G. Oomi, R. Yagi, Y. Iye, Y. Onuki and T. Komatsubara:

“Effect of Pressure on the Magnetoresistance of CeInCu2”, J. Alloy. Compd 207 (1994) 271-274. DOI: 10.1016/0925-8388(94)90219-4

 

[R13]  R. Yagi and Y. Iye:"On the Peak Inversion of The Angular Dependent Magnetoresistance Oscillation of Cylindrical Fermi Surfaces with Different Corrugation Symmetries", Solid State Commun. 89(1994)275-281. DOI: 10.1016/0038-1098(94)90697-1

 

[R12] Y. Iye, R .Yagi, N. Hanasaki, S. Kagoshima, H. Mori, H. Fujimoto and G. Saito,

“Study of the Angular Dependent Magnetoresistance Oscillations in alpha-(BEDT-TTF)2M(SCN)4 [M:K, NH4]”,

Physica B 201 (1994) 474-478. DOI: 10.1016/0921-4526(94)91140-1

 

[R11] R.Yagi and Y.Iye:

"Oscillatory Magnetoresistance in Two-Dimensional Electron Systems in a Periodically Modulated Magnetic Field'',

J. Phys. Soc. Jpn., 62  (1993) 1279-1285. DOI: 10.1143/JPSJ.62.1279

 

[R10] S. Kagoshima, T. Osada, A. Kawasumi, R. Yagi, N. Miura, M. Oshima H. Mori, T. Nakamura, and G. Saito,

"Magnetotransport studies of Topology of Fermi Surface of the Quasi Two-Dimensional Organic Conductors  (BEDT-TTF)2KHg(SCN)4 , the Isostructural Metal  (BEDT-TTF)2(NH4)Hg(SCN)4 and the Quasi One-Dimensional Superconductor (TMTSF)2ClO4", Mechanism of  Superconductivity, eds. Y.Muto,

JJAP Series 7 (1992) 381-389.

 

[R9] R.Yagi and Y.Iye,

"On the Temperature Dependence of Hall Effect in Low Carrier Density Metals'',

J. Phys. Soc. Jpn. 61 (1992) 227-232. DOI: 10.1143/JPSJ.61.227

 

*[R8] T.Kagayama, G.Oomi, R.Yagi, Y.Iye, Y.Onuki and T.Komatsubara,

" Pressure-Induced Positive Magnetoresistance in the Heavy Fermion Compound CeInCu2'',

J. Phys. Soc. Jpn. 61 (1992) 2632-2635.DOI: 10.1143/JPSJ.61.2632

 

[R7] R.Yagi, Y.Iye, T.Osada, and S.Kagoshima,

"Angular Dependent Oscillatory Magnetoresistance in Quasi-Two-Dimensional Systems'',

Synth. Met. 42 (1991) 2237-2240. DOI: 10.1016/0379-6779(91)92044-I

 

[R6] T.Osada, R.Yagi, A.Kawasumi, S.Kagoshima, N.Miura, M.Oshima, H.Mori, T.Nakamura, and G.Saito:

"Fermiology and unusual high-field magnetotransport in novel organicmetals (BEDT-TTF)2XHg(SCN)4 (X=K,NH4)'', Synth. Met. 42 (1991) 2171-2174. DOI: 10.1016/0379-6779(91)92044-I

 

[R5] R.Yagi, Y.Iye, Y.Hashimoto, T.Odagiri, H.Noguchi, H.Sakaki, and T.Ikoma:

"Angular Dependent Magnetoresistance Oscillation in GaAs/AlxGa1-xAs Superlattice'',

J. Phys. Soc. Jpn. 60(1991) 3784-3791. DOI: 10.1143/JPSJ.60.3784

 

[R4]  R.Yagi, Y.Iye, T.Osada, and S.Kagoshima:

"Semiclassical Interpretation of Angular Dependent Oscillatory Magnetoresistance in Quasi-Two-Dimensional Systems'', J. Phys. Soc. Jpn. 59  (1990) 3069-3072. DOI: 10.1143/JPSJ.59.3069

 

[R3] T.Osada, R.Yagi, S.Kagoshima, N.Miura, M.Oshima, and G.Saito:

"High-field Magnetotransport and Fermi-Surface Topology in the Novel Quasi-Two-Dimensional Organic Conductor bis(ethylenedithiolo)tetrathiafulvalenium mercuric potassium thiocyanate, (BEDT-TTF)2KHg(SCN)4"

 Phys. Rev. B41 (1990) 5428-5431.  DOI: 10.1103/PhysRevB.41.5428

 

[R2] T.Osada, R.Yagi, S.Kagoshima, N.Miura, M.Oshima, and G.Saito:

" High-field Magnetotransport in the Organic Conductor (BEDT-TTF)2KHg(SCN)4''

The Physics and Chemistry of Organic Superconductors, eds. G.Saito and S.Kagoshima,

(Springer-Verlag,Heidelberg,1990) pp.220-223.  

 

[R1] T.Osada, A.Kawasumi, R.Yagi, S.Kagoshima, N.Miura, M.Oshima, H.Mori, T.Nakamura, and G.Saito:

"Quantum Oscillations of Magnetoresistance in a New Organic Superconductor (BEDT-TTF)2(NH4 )Hg(SCN)4'' 

Solid State Commun. 75 (1990) 901-905. DOI: 10.1016/0038-1098(90)90407-3



Publications in Japanese

Books

 

1八木隆多　グラフェンの機能と応用展望　シーエムシー出版　監修　徳本洋志、斉木幸一郎　（分担執筆　9章　単層グラフェンの輸送現象　）　2009年７月

 

2八木隆多　丸善実験物理講座　第11巻 (小林俊一、大塚洋一編）

　　1999年10月　分担執筆   (第3章第2節 , 第4章第6節,　第1章)

 

Articles

 

1 八木隆多  グラフェンの磁気抵抗

固体物理　特集号 ディラック電子系の固体物理　 固体物理　45,631-644　(2010)

 

2 八木隆多　微小トンネル接合の基礎と応用

広島大学低温センターだより　　pp9-11 (2000)

 

3 家泰弘、八木隆多　

「磁場中で試料を回転するいくつかの方法」

固体物理 26(1991)892-898.

 

4 八木隆多、　家泰弘:

変調構造下での磁気輸送現象

生産研究  45(1993)116-120.

 

5 神田晶申、八木隆多、山田廉一、小林俊一:

微小トンネル接合のネットワークにおけるKosteritz-Thouless 転移

日本物理学会誌　1995 vol 50 p643-646.

 

 

 

解説記事翻訳

1　呼吸する超伝導のはしご　Ｌ.フロリア著　八木隆多　訳

パリティー2000年12月号　pp23-24.

 

2　古典力学が破綻している、ナノスケールの世界の多様性　「量子ショットノイズは何を語るか」　　　八木隆多訳　　パリティー 2004年　2月号pp14-23.

Presentation at international conferences

  

[S40] R. Yagi, R. Sakakibara, R. Ebisuoka, J. Onishi,  K. Watanabe, T. Taniguchi and Y. Iye,

“Commensurability magnetoresistance due to ballistic transport in highmobility graphene antidot lattices made on h-BN”

33rd International Conference on the Physics of Semiconductors,  Beijin, China, Jul 31- Aug. 5, 2016.

 

[S39] R. Yagi, R. Sakakibara, R. Ebisuoka, J. Onishi, K. Watanabe, T. Taniguchi and Y. Iye.

Magneto-transport of high-mobility graphene antidot lattices made on h-BN – ballistic and phase coherent transport

The 22nd International Conference on High Magnetic Fields in Semiconductor Physics, Sapporo Japan, Jul 25- 29,2016.

 

[S38] R. Ebisuoka, S. Uchino, T. Hirahara, J. Onishi, K. Watanabe, T. Taniguchi and R. Yagi

“Brillouin zone folding and anisotropic ban structure in more superlattices in bilayer graphene/h-BN heterostructure,

The 22nd International Conference on High Magnetic Fields in Semiconductor Physics, Sapporo Japan, Jul 25- 29, 2016.

 

[S37] T. Hirahara, S. Uchino, R. Ebisuoka, J. Onishi, K. Watanabe T. Taniguchi and R. Yagi

“Magnetotransport study of electronic band structure in tetralayer graphene using high-mobility graphene fabricated on h-BN”

The 22nd International Conference on High Magnetic Fields in Semiconductor Physics, Sapporo Japan, Jul 25-29, 2016.

 

[S36] R. Yagi, M. Shimomura, and S. Fukada

“Graphene made by exfoliation of graphite intercalation compound”

The Sixteenth International Conference on the Science and Application of Nanotubes, Nagoya, Japan,June 28- July 3, 2015.

 

[S35] R. Yagi, R, Sakakibara, and R. Ebisuoka

“Quantum Correction to Conductance in Graphene Antidot Lattices”

21st International Conference on Electronic Properties of Two-Dimensional Systems, Sendai, Japan,  Jul 26-31, 2015.

 

[S34] R. Yagi, R. Sakakibara, R. Ebisuoka, J. Onishi,  K. Watanabe, T. Taniguchi and Y. Iye,

“Ballistic transport in graphene antidot lattices.”

Americal Physical Society March meeting, Baltimore, USA  2016.

 

[S33] R. Yagi, R. Sakakibara, J. Onishi

Altshuler-Aronov-Spivak Osicllation in Graphene Antidot Lattice

Americal Physical Society March meeting, San Antonio, USA, Mar. 2-6,2015.

 

[S32] R. Yagi, R. Sakakibara, F. Tahara, J. Onishi, D. Takegawa

Magnetoresistance of thin film devices fabricated from bulk crystal of Bi2Se3 and Bi2Te3

Americal Physical Society March meeting, Denver, USA, Mar. 3-7, 2014.

 

[S31] R. Yagi, M. Shimomura, F. Tahara, S. Fukada

“Fabricating graphene from graphite intercalation compounds”

Americal Physical Society March meeting, Baltimore, USA, Mar.18-22, 2013

 

[S30] R. Yagi, S. Fukada, Y. Shintani,

Fluctuation of magnetoresistance at the minimum conductivity point of monolayer graphene due to potential fluctuation,

Americal Physical Society March meeting,Portland, USA, Mar. 15-19, 2010.

 

[S29] Ryuta Yagi, Seiya Fukada, Yumi Shintani

“Magnetic fingerprint of mono-layer graphene”

Recent Advances in Graphene and Related Materials,

Aug, 1-6,  2010, Singapore.

 

[S28] R. Yagi, S. Fukada, H. Kobara, N. Ogita and M. Udagawa

Negative magnetoresistance due to charge fluctuation in mono-layer graphene at the minimum conductivity point,

The 18th international conference on electronic property of two dimensional systems （EP2DS）,  July 19-24, 2009 Kobe, Japan.

 

[S27] R. Yagi,　

“Magnetotransport of graphene FET”,　

The 4th International Symposium on Atomic Technology, 17-18, Nov,2009, Maiko, Japan.

 

[S26] K. Tsuboi and R. Yagi,

“Relaxation of Charge Imbalance in Non-equilibrium Superconductivity Due to Pair Breaking Perturbation by Magnetic Field”,

 9th International Conference on Material and Mechanisms of Superconductivity (M2S-IX), Tokyo, Japan. Sept 7-12, 2009.

 

[S25] R. Yagi,

 "Physics of small tunnel junctions",

1st HU-SKKU Workshop on Advanced Materials Research, Hiroshima, Japan, Nov 16-17, 2006.

 

[S24] K. Utsunomiya, K. Tsuboi, T. Kubota, Y. Terao, Y. Ikebuchi, R. Yagi,  Quasi-Particle Recombination in mesoscopic superconducting wires, Mesoscopic Superconductivity and Spintronics  (MS+S2006), Atsugi (NTT), Japan  Feb. 27-Mar.2, 2006.

 

[S23] K. Tsuboi,  K. Utsunomiya,  T. Kubota, Y. Terao, Y. Ikebuchi, R. Yagi,

Energy Distribution of Quasi-Particle Charge Density in Mesoscopic Superconducting Wires ,

Mesoscopic Superconductivity and Spintronics  (MS+S2006),  Atsugi,  Japan, Feb. 27-Mar.2 , 2006.

 

[S22] K. Utsunomiya and  R. Yagi,

Effect of Quasi-particle injection on retrapping current of Josephson junction,  The 3rd Hiroshima Workshop NFM2F. Hiroshima University, Nov. 16-19, 2005.

 

[S21] T. Kubota and R. Yagi,

Transport property of Cr/CrOx/Cr Single Electron Transistor fabricated using Plasma Oxidation ,

The 3rd Hiroshima Workshop NFM2F. Hiroshima University, Nov. 16-19, 2005.

 

[S20] H. Sera, Y. Ikebuchi and R. Yagi,

Observation of Non-Equilibrium Superconductivity Using DC-SQUID,

The 3rd Hiroshima Workshop NFM2F. Hiroshima University, Nov. 16-19, 2005.

 

[S19] R. Yagi,

Quasi-particle recombination in Narrow Superconducting Wires, 24th International Conference on Low Temperature Physics, Florida, USA,  Aug. 10-17, 2005.

 

[S18] T. Kubota, R. Yagi,

Fabrication of Cr/CrOx/Cr Small Capacitance Junctions, 24th International Conference on Low Temperature Physics,  Florida, USA, Aug. 10-17, 2005

 

[S17]  R. Yagi,

Non-equilibrium Quasi-Particle Transport in Narrow Superconducting Wires,

Mesoscopic Superconductivity and Spintronics  (MS+S 2004), Atsugi (NTT), Japan, Mar. 1-4 , 2004.

 

[S16] Y. Ikebuchi and R. Yagi, 

The 15th International Conference on Electronic Properties of Two-Dimensional Systems (EP2DS), Nara, Japan, Jul. 14-18, 2003.

[S15] R. Yagi,Quasi-Particle Transport in Narrow superconducting wires with superconductor/insulator/normal tunnel junctions,  NPMS-6 Sixth International Conference on New Phenomena in Mesoscopic Structures and Fourth International Conference on Surfaces and Interfaces of Mesoscopic Devices, Hawaii, USA, Dec. 1-5, 2003.

 

[S14]  S. Sakita and R. Yagi,  

Resistance Fluctuation in Narrow Ferromagnetic Wires, 

International Conference on Low Temperature Physics, Hiroshima, Aug. 12-22, 2002

 

[S13] R．Yagi, S. Kobayashi and Y. Ootuka, “Superconductor-Insulator Transition in Single Small Josephson Junction with Normal Tunneling Junction and Ohmic Shunt Resistor”, 22 th International Conference on Low Temperature Physics (LT22), Helsinki, Finland, Aug.4-11, 1999   ( invited )

 

[S12]  R. Yagi, S. Kobayashi and Y. Ootuka, “Dependence on Shunt Resistance and Distance on Single Small Josephson Junctions”, Fourth International Symposium on New phenomena in Mesoscopic Structures", Hawaii, USA, Dec. 6-12,1998.

 

[S11]  R. Yagi, S. Kobayashi and Y. Ootuka, “Superconductor-Insulator Transition in Single Small Josephson Junction with Shunt Resistor”, International Workshop on Nano-Physics and Electronics, Tokyo, Japan, Sep. 18-20, 1997.

 

[S10] R. Yagi, S. Kobayashi,“Superconductor-Insulator Transition in Single Small Josephson Junction with Shunt Resistor”, CMD Condensed Matter Division, Europian Physical Society, Leuven, Belgium, Aug.18-20, 1997.

 

[S9] R. Yagi, T. Yamaguchi, H. Kazawa and S. Kobayashi, “Phase Diagram for Superconductor-Insulator Transitons in Two-Dimensional Network of Small Tunnel Junctions”, International Conference on Low Temperature Physics (LT21), Prague, Czech, Aug. 7-15, 1996.

 

[S8]  R. Yagi, T. Yamaguchi, and S. Kobayashi, “Effect of Finite System Width in Two-Dimensional Network of Small Tunnel Junctions”, International Conference on Low Temperature Physics (LT21), Prague, Czech, Aug. 7-15, 1996.

 

[S7]  R. Yagi, T. Yamaguchi, H. Kazawa and S. Kobayashi, “Capacitance Dependence of Critical Tunnelling Resistance for Superconductor-Insulator Transition in Two-Dimensional Network of Josephson Junctions”, Third International Symposium on New phenomena in Mesoscopic Structures", Hawaii, USA, Dec.4-8,1995.

 

[S6]  R. Yagi and S. Kobayashi, “Breakdown of Charge-Vortex Duality in Small Tunnel Junction Arrays with Finite Width”, International Workshop on Mesoscopic Physics and Electronics (MPE 95), Tokyo, Japan, Mar. 4-6, 1995.

 

[S5] Y. Iye, R. Yagi, Y. Hashimoto, and T. Ikoma, “Magnetoresistance in Modulated Structures”, Second International Symposium on New phenomena in Mesoscopic Structures, Hawaii, USA, Dec. 1992.

 

[S4]  R. Yagi, Y. Iye, Y. Hashimoto, T. Odagiri, H. Noguchi, H. Sakaki and T. Ikoma, “Angular Dependent Magnetoresistance Oscillation in GaAs/AlxGa1-xAs Superlattice”, Electronic Properties of Two-Dimensional Systems (The 9th international Conference) Nara, Japan, Jul. 8-12, 1991.

 

[S3]  R.Yagi, Y.Iye, T.Osada, and S.Kagoshima, “Angular Dependent Oscillatory Magnetoresistance in Quasi-Two-Dimensional Systems”, International Conference on Science and Technology of Synthetic Metals (ICSM 90) Tubingen, Germany, Sep. 2-7, 1990.

 

[S2]  T. Osada, R. Yagi, A. Kawasumi, S. Kagoshima, N. Miura, M. Oshima, H. Mori, T. Nakamura, and G. Saito, “Fermiology and unusual high-field magnetotransport in novel organicmetals (BEDT-TTF)2XHg(SCN)4 (X=K,NH4)”, International Conference on Science and Technology of Synthetic Metals (ICSM ‘90), Tubingen, Germany, September 2-7, 1990.

 

[S1] T. Osada, R. Yagi, S. Kagoshima, N. Miura, M. Oshima, and G. Saito, “High Field Magnetotransport in the Organic Conductor (BEDT-TTF)2KHg(SCN)4”, Physics and Chemistry of Organic Conductors, I.S.S.P. International Symposium, Tokyo, Japan, Aug. 28-30, 1989.

 

 

 

 

招待公演

 

[R8] R. Yagi,  Electronic band structgure in graphene with multiple number of layers, The fullerlenes, nanotube and graphene general symposium 9.8 2020, Japan (Online).

[R7] 八木隆多　「グラフェンの磁気輸送」

グラフェン・ナノ物理研究会, 秋田大学,　11/12 (2011).

 

[R6] 八木隆多　「グラフェンの電子輸送」

広島大学、物性セミナー第４００回記念講演会　11/1 (2011).

 

[R5] R. Yagi,　“Magnetotransport of graphene FET”,　The 4th International Symposium on Atomic Technology, 17-18, Nov,2009, Maiko, Japan.

 

[R5 ]八木隆多　「グラフェンの輸送現象（レビュー）」東京大学物性研究所短期研究会、ディラック電子系の物性―グラフェンおよび関連物質の最近の研究　2009年10/22-10/24. 東京大学（柏キャンパス）

 

[R4] 八木隆多　「超伝導準粒子注入」　佐々木学術シンポジウム2004年,12/22-23

東京大学（本郷キャンパス）

 

[R3] 八木隆多　「非平衡超伝導現象」

広島大学・総合科学部・永井研究室セミナー  2004年5月

 

[R2] R．Yagi, S. Kobayashi and Y. Ootuka, “Superconductor-Insulator Transition in Single Small Josephson Junction with Normal Tunneling Junction and Ohmic Shunt Resistor”, 22 th International Conference on Low Temperature Physics (LT22), Helsinki, Finland, August 4-11, 1999.

 

[R1] 八木隆多　「微小トンネル接合における量子相転移」

東京大学・物性研究所・今田研究室セミナー東京大学（六本木キャンパス）1999年7月

 

 

 

受賞

 

井上研究奨励賞　（井上財団　1996年２月)　（変調構造下の磁気抵抗振動）

 

 

学会、社会貢献活動

2015年　オープンキャンパス講義　未来物質グラフェン

2015年　広島大学理学部　中高生サイエンス大会　　　コメンテーター

2005年The 3rd Hiroshima Workshop NFM2F. Hiroshima University, Nov. 16-19, 2005, organizing committee.

2000年　 低温国際会議(LT23) ポスター賞審査委員

1997-1998 日本物理学会　低温分科世話人

1988 放送大学面接授業（実験補助）

 

学内委員

低温センター運営委員　(2000-2002)

広島大学先進物質科学研究開発センター　運営委員 (-2017)

広島大学ナノデバイス研究センター　運営委員 (2003-2005)

広島大学低温センター低温だより編集委員長  (2000-2002)

広島大学理学部　入学試験委員（教育交流委員＋入試問題等検討委員）(2015-2017)

物理科学科学生チューター(2015-2017)

物理科学科学生チューター (2015-2017)

 

免許など

高圧ガス保安責任者免状（乙種機械）

 

国内学会

省略