Valley symmetry breaking in bilayer graphene: a test to the minimal model - Condensed Matter > Mesoscale and Nanoscale PhysicsReportar como inadecuado




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Abstract: Physical properties reflecting valley asymmetry of Landau levels in a biasedbilayer graphene under magnetic field are discussed. Within the $4-$bandcontinuum model with Hartree-corrected self-consistent gap and finite dampingfactor we predict the appearance of anomalous steps in quantized Hallconductivity due to the degeneracy lifting of Landau levels. Moreover, thevalley symmetry breaking effect appears as a non-semiclassical de Haas-vanAlphen effect where the reduction of the oscillation period to half cannot beaccounted for through quasi-classical quantization of the orbits in reciprocalspace, still valley degenerate.



Autor: Masaaki Nakamura, Eduardo V. Castro, Balazs Dora

Fuente: https://arxiv.org/







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