Magneto-oscillation phase anomalies in bilayer graphene with broken inversion symmetry
Abstract
Using the four-band continuum model based on the tight-binding approximation we constructed the Landau plot describing the magnetic-field-induced oscillations of the electron density of states in graphene bilayers. It turns out that the oscillations are only asymptotically periodic, i.e, that they reach the frequencies predicted quasiclassically only at low magnetic fields and high Landau level indices. These quasiclassical frequencies are the same for K and K' valleys of the Brillouin zone. The quantum approach reveals the valley-dependent gate-tunable corrections to the oscillation phases, which give rise to two different series of magneto-oscillations, corresponding to K and K', respectively, with the same frequency but shifted in phase.
- Publication:
-
Physics of Semiconductors: 30th International Conference on the Physics of Semiconductors
- Pub Date:
- December 2011
- DOI:
- 10.1063/1.3666629
- Bibcode:
- 2011AIPC.1399..821G
- Keywords:
-
- electron density;
- carbon compounds;
- Brillouin zones;
- inversion layers;
- 71.23.Cq;
- 81.05.ue;
- 71.20.Rv;
- 73.20.At;
- Amorphous semiconductors metallic glasses glasses;
- Polymers and organic compounds;
- Surface states band structure electron density of states