Quantum conductivity correction in a two-dimensional disordered pseudospin-1 system
Abstract
Using the Feynman diagram techniques, we theoretically obtain the quantum conductivity correction for a two-dimensional pseudospin-1 electron system in the presence of long-range diagonal disorder. Theoretical results clearly reveal that the quantum correction depends on the sublattice correlation properties of disorder potential. The sublattice correlated disorder gives rise to normal weak localization, while the sublattice uncorrelated impurity potential leads to the absence of logarithmic term in quantum conductivity correction. Remarkably, those results cannot be understood by conventional symmetry classification. An additional symmetry operator involving internal sublattice degrees of freedom, analogous with the time reversal symmetry operator, enables us to clarify our findings from symmetry consideration.
- Publication:
-
Physical Review B
- Pub Date:
- April 2019
- DOI:
- 10.1103/PhysRevB.99.134204
- Bibcode:
- 2019PhRvB..99m4204Y