TY - JOUR
T1 - Bilayer graphene under pressure
T2 - Electron-hole symmetry breaking, valley Hall effect, and Landau levels
AU - Munoz, F.
AU - Collado, H. P.Ojeda
AU - Usaj, Gonzalo
AU - Sofo, Jorge O.
AU - Balseiro, C. A.
N1 - Funding Information:
F.M. is supported by 'Financiamiento Basal para Centros Cientificos y Tecnologicos de Excelencia FB 0807' and Fondecyt Grant No. 1150806. J.O.S. and C.A.B. are grateful to the American Physical Society International Travel Grant Awards Program that supported the visit of C.A.B. to Penn State when this work was started. H.P.O.C., G.U., and C.A.B. acknowledge financial support from PICTs 2013-1045 and Bicentenario 2010-1060 from ANPCyT, PIP 11220110100832 from CONICET, and Grant No. 06/C415 from SeCyT-UNC. G.U. acknowledges support from the ICTP associateship program and the Simons Foundation.
Publisher Copyright:
© 2016 American Physical Society.
PY - 2016/6/27
Y1 - 2016/6/27
N2 - The electronic structure of bilayer graphene under pressure develops very interesting features with an enhancement of the trigonal warping and a splitting of the parabolic touching bands at the K point of the reciprocal space into four Dirac cones, one at K and three along the T symmetry lines. As pressure is increased, these cones separate in reciprocal space and in energy, breaking the electron-hole symmetry. Due to their energy separation, their opposite Berry curvature can be observed in valley Hall effect experiments and in the structure of the Landau levels. Based on the electronic structure obtained by density functional theory, we develop a low energy Hamiltonian that describes the effects of pressure on measurable quantities such as the Hall conductivity and the Landau levels of the system.
AB - The electronic structure of bilayer graphene under pressure develops very interesting features with an enhancement of the trigonal warping and a splitting of the parabolic touching bands at the K point of the reciprocal space into four Dirac cones, one at K and three along the T symmetry lines. As pressure is increased, these cones separate in reciprocal space and in energy, breaking the electron-hole symmetry. Due to their energy separation, their opposite Berry curvature can be observed in valley Hall effect experiments and in the structure of the Landau levels. Based on the electronic structure obtained by density functional theory, we develop a low energy Hamiltonian that describes the effects of pressure on measurable quantities such as the Hall conductivity and the Landau levels of the system.
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U2 - 10.1103/PhysRevB.93.235443
DO - 10.1103/PhysRevB.93.235443
M3 - Article
AN - SCOPUS:84976546801
VL - 93
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 2469-9950
IS - 23
M1 - 235443
ER -