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題名 Anomalous integer quantum Hall effect in AA-stacked bilayer graphene 作者 郭光宇
Guo, Guang-Yu貢獻者 應物所 日期 2010 上傳時間 24-Jan-2014 12:23:16 (UTC+8) 摘要 Recent experiments indicate that -stacked bilayer graphenes (BLGs) could exist. Since the energy bands of the -stacked BLG are different from both the monolayer and -stacked bilayer graphenes, different integer quantum Hall effect in the -stacked graphene is expected. We have therefore calculated the quantized Hall conductivity and also longitudinal conductivity of the -stacked BLG within the linear-response Kubo formalism. Interestingly, we find that the -stacked BLG could exhibit both conventional insulating behavior (the plateau) and chirality for , where is the filling factor, is the chemical potential, and is the interlayer hopping energy, in striking contrast to the monolayer graphene and -stacked BLG. We also find that for , where , , and , the Hall conductivity is quantized as , if and , if . However, if , the plateaus are absent, where Furthermore, we find that when the magnetic field , , the plateau across would disappear and the step at would occur. Finally, we show that in the low-disorder and high-magnetic-field regime, , as long as the Fermi level is not close to a Dirac point. 關聯 Physical Review B, 82(16), 165404 資料類型 article DOI http://dx.doi.org/10.1103/PhysRevB.82.165404 dc.contributor 應物所 en_US dc.creator (作者) 郭光宇 zh_TW dc.creator (作者) Guo, Guang-Yu en_US dc.date (日期) 2010 en_US dc.date.accessioned 24-Jan-2014 12:23:16 (UTC+8) - dc.date.available 24-Jan-2014 12:23:16 (UTC+8) - dc.date.issued (上傳時間) 24-Jan-2014 12:23:16 (UTC+8) - dc.identifier.uri (URI) http://nccur.lib.nccu.edu.tw/handle/140.119/63532 - dc.description.abstract (摘要) Recent experiments indicate that -stacked bilayer graphenes (BLGs) could exist. Since the energy bands of the -stacked BLG are different from both the monolayer and -stacked bilayer graphenes, different integer quantum Hall effect in the -stacked graphene is expected. We have therefore calculated the quantized Hall conductivity and also longitudinal conductivity of the -stacked BLG within the linear-response Kubo formalism. Interestingly, we find that the -stacked BLG could exhibit both conventional insulating behavior (the plateau) and chirality for , where is the filling factor, is the chemical potential, and is the interlayer hopping energy, in striking contrast to the monolayer graphene and -stacked BLG. We also find that for , where , , and , the Hall conductivity is quantized as , if and , if . However, if , the plateaus are absent, where Furthermore, we find that when the magnetic field , , the plateau across would disappear and the step at would occur. Finally, we show that in the low-disorder and high-magnetic-field regime, , as long as the Fermi level is not close to a Dirac point. en_US dc.format.extent 159367 bytes - dc.format.mimetype application/pdf - dc.language.iso en_US - dc.relation (關聯) Physical Review B, 82(16), 165404 en_US dc.title (題名) Anomalous integer quantum Hall effect in AA-stacked bilayer graphene en_US dc.type (資料類型) article en dc.identifier.doi (DOI) 10.1103/PhysRevB.82.165404 - dc.doi.uri (DOI) http://dx.doi.org/10.1103/PhysRevB.82.165404 -
