- 

                     　　　　　　　　　　 Yagi Group

　　　　　　　　　　　　　Nano Science and Low Tempeature Physics

　　　　　　　　　　Gaduate School of Advanced Sciences and Engineering, Hiroshima University

 (Graduate School of Advanced Sciences of Matter, Hiroshima University)

Kagamiyama 1-3-1, Higashi Hiroshima, 739-8530 Japan:  Phone  +81-82-4247041 (Yagi)  +81-82-4247042 (Laboratory)　　　

        Member     Researches   Facilities 　 Activity   　 Access　　Japanese

NEWS

Our review was published in KOTAI BUTSURI (in japanese)

Our research result was introduced by JST on the web site "kegan riben　客観日本" 2022.2.22

keguan riben 客観日本

Our research paper was introdced by a Japanese news paper, Kagaku Shinbun. 2022.1.28

https://www.keguanjp.com/kgjp_keji/kgjp_kj_new/pt20220222000002.html

Our paper on twisted double bilayer graphene was selected for the  Editor's Choice in Journal of Physical Society of Japan. (J. Phys. Soc .Jpn. (Oct. 5 2021) , 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).  

Fumiya Mukai presented a recent research result in EP2DS on Nov. 5.

Our paper was published in J. Phys. Soc .Jpn. (Oct. 5 2021) , 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).  

Our paper was published in Commun.  Phys. (Nature portfolio)  Fumiya Mukai, Kota Horii, Ryoya Ebisuoka, Kenji Watanabe, Takashi Taniguchi and Ryuta Yagi, Unconventional satellite resistance peaks in moiré superlattice of h-BN/AB-stacked tetralayer graphene heterostructures, Commun. Phys. 4, 109 (2021). DOI:10.1038/s42005-021-00615-2

Our paper was published in J. Phys. Soc. Jpn .  Multiband ballistic transport and anisotropic commensurability magnetoresistance in antidot lattices of AB-stacked trilayer graphene, Shingo Tajima, Ryoya Ebisuoka, Kenji Watanabe, Takashi Taniguchi and Ryuta Yagi. J. Phys. Soc. Jpn 89, 044703 (2020).  DOI:10.7566/JPSJ.89.044703

Our paer was published.   Tomoaki Nakasuga, Taiki Hirahara, Kota Horii, Ryoya Ebisuoka, Shingo Tajima, Kenji Watanabe, Takashi Taniguchi, and Ryuta Yagi, Intrinsic resistance Peaks in AB-stacked multilayer graphene with odd number of layers, Phys. Rev. B, 101 035419 (2020) .   DOI:10.1103/PhysRevB.101.035419

      * Renewed on Oct. 4,  2022

　Recent studies:

Graphene

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

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

Tetralayer graphene shows intrinsic resistance peaks in the gate voltage dependence of resistance at zeromagnetic fields. These peaks originate from band structure.

Tetralayer graphene  (a)Backgate voltage dependence of resistance shows complicated peaks, which varies with top gate voltages.  (b) A map of resistivity as a function of carriers induced by top and bottom gate voltages. (c) A map of resistivity as a function of carrier density and perpendicular electric flux density. Resistance ridges are discernible.

Key words:  tetralayer graphene, hexlayer graphene, ridge structure, top and bottom gate, Landau fan diagram

Low energy band structure of graphene. How the atomic layers aquire a bulk character.　Yagi et al. Sci.Rep. 8, 13018 (2018).

We have measured the Landau fan diagrams of one to 7 layer graphene (AB-stacking). Even odd layer number effect was clearly observed.

Key workds, monolayer, bilayer, trilayer, tetralayer, pentalayer, hexlayer, heptalayer graphene, Landau fan diagram

　You can make graphene!  An instruction manual for high school students, only in Japanese.

       To downlad pdf file, click here

e-mail    yagi(at)hiroshima-u.ac.jp