Quantum Hall effect in bilayer graphene: Disorder effect and quantum phase transition Export

@article{citeulike:6058749, abstract = {We numerically study the quantum Hall effect (QHE) in bilayer graphene based on tight-binding model in the presence of disorder. Two distinct QHE regimes are identified in the full energy band separated by a critical region with nonquantized Hall Effect. The Hall conductivity around the band center (Dirac point) shows an anomalous quantization proportional to the valley degeneracy, but the =0 plateau is markedly absent, which is in agreement with experimental observation. In the presence of disorder, the Hall plateaus can be destroyed through the float-up of extended levels toward the band center and higher plateaus disappear first. The central two plateaus around the band center are most robust against disorder scattering, which is separated by a small critical region in between near the Dirac point. The longitudinal conductance around the Dirac point is shown to be nearly a constant in a range of disorder strength, until the last two QHE plateaus completely collapse.}, author = {Ma, R. and Sheng, L. and Shen, R. and Liu, M. and Sheng, D. N.}, citeulike-article-id = {6058749}, citeulike-linkout-0 = {http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRBMDO000080000020205101000001&idtype=cvips&gifs=yes}, citeulike-linkout-1 = {http://link.aps.org/abstract/PRB/v80/e205101}, citeulike-linkout-2 = {http://dx.doi.org/10.1103/PhysRevB.80.205101}, doi = {10.1103/PhysRevB.80.205101}, journal = {Physical Review B (Condensed Matter and Materials Physics)}, keywords = {bilayer, graphene, hall, tb}, number = {20}, pages = {205101+}, posted-at = {2009-11-03 09:57:39}, priority = {2}, publisher = {APS}, title = {Quantum Hall effect in bilayer graphene: Disorder effect and quantum phase transition}, url = {http://dx.doi.org/10.1103/PhysRevB.80.205101}, volume = {80}, year = {2009} }

TY - JOUR ID - citeulike:6058749 L3 - citeulike-article-id:6058749 N2 - We numerically study the quantum Hall effect (QHE) in bilayer graphene based on tight-binding model in the presence of disorder. Two distinct QHE regimes are identified in the full energy band separated by a critical region with nonquantized Hall Effect. The Hall conductivity around the band center (Dirac point) shows an anomalous quantization proportional to the valley degeneracy, but the =0 plateau is markedly absent, which is in agreement with experimental observation. In the presence of disorder, the Hall plateaus can be destroyed through the float-up of extended levels toward the band center and higher plateaus disappear first. The central two plateaus around the band center are most robust against disorder scattering, which is separated by a small critical region in between near the Dirac point. The longitudinal conductance around the Dirac point is shown to be nearly a constant in a range of disorder strength, until the last two QHE plateaus completely collapse. IS - 20 JF - Physical Review B (Condensed Matter and Materials Physics) TI - Quantum Hall effect in bilayer graphene: Disorder effect and quantum phase transition PB - APS VL - 80 SP - 205101 KW - bilayer KW - graphene KW - hall KW - tb AU - Ma, R AU - Sheng, L AU - Shen, R AU - Liu, M AU - Sheng, DN PY - 2009/// UR - http://dx.doi.org/10.1103/PhysRevB.80.205101 ER -