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政大典藏 > College of Science > Graduate Institute of Applied Physics > Periodical Articles > Item 140.119/63532

Please use this identifier to cite or link to this item: https://nccur.lib.nccu.edu.tw/handle/140.119/63532

Title:	Anomalous integer quantum Hall effect in AA-stacked bilayer graphene
Authors:	郭光宇 Guo, Guang-Yu
Contributors:	應物所
Date:	2010
Issue Date:	2014-01-24 12:23:16 (UTC+8)
Abstract:	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.
Relation:	Physical Review B, 82(16), 165404
Data Type:	article
DOI link:	http://dx.doi.org/10.1103/PhysRevB.82.165404
DOI:	10.1103/PhysRevB.82.165404
Appears in Collections:	[Graduate Institute of Applied Physics] Periodical Articles

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