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                                Yagi Group

             Nano Science and Low Tempeature Physics

           Graduate School of Advanced Sciences of Matter, 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

NEW: 2020 Mar 9 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

NEW: 2020 Jan 22    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

NEW: 2019 Dec 19 Our paper was Published.   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). DOI: 10.1103/PhysRevB.100.24542

Our paper was published.  Low-energy band structure in Bernal stacked six-layer graphene: Landau  fan diagram and resistance ridge. Phys. Rev. B 99, 085404 (2019). DOI: 10.1103/PhysRevB.99.085404.

 Our paper was published. Ballistic transport experiment detects Fermi surface anisotropy of graphene, Oka et al.,  Phys. Rev. B 99, 035440 (2019). DOI: 10.1103/PhysRevB.99.035440

 

      * Renewed on Feb.  12,  2020

 

 

 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