Weak-localization approach to a 2D electron gas with a spectral node
arXiv:1311.3441 · doi:10.1016/j.physe.2015.03.017
Abstract
We study a weakly disordered 2D electron gas with two bands and a spectral node within the weak-localization approach and compare its results with those of Gaussian fluctuations around the self-consistent Born approximation. The appearance of diffusive modes depends on the type of disorder. In particular, we find for a random gap a diffusive mode only from ladder contributions, whereas for a random scalar potential the diffusive mode is created by ladder and by maximally crossed contributions. The ladder (maximally crossed) contributions correspond to fermionic (bosonic) Gaussian fluctuations. We calculate the conductivity corrections from the density--density Kubo formula and find a good agreement with the experimentally observed V-shape conductivity of graphene.
10 pages, 2 figures
References in corpus (7)
- Weak localisation magnetoresistance and valley symmetry in graphene
- Strong suppression of weak (anti)localization in graphene
- Weak localisation in graphene flakes
- On electron (anti)localization in graphene
- Long-range correlations in disordered graphene
- Dynamical symmetry breaking in a 2D electron gas with a spectral node
- Anderson localization in a two-dimensional random gap model