Hidden Anisotropy in the Drude Conductivity of Charge Carriers with Dirac-Schrödinger Dynamics
arXiv:1905.04292 · doi:10.1103/PhysRevB.100.035427
Abstract
We show that the conductivity of a two-dimensional electron gas can be intrinsically anisotropic despite isotropic Fermi surface, energy dispersion, and disorder configuration. In the model we study, the anisotropy stems from the interplay between Dirac and Schrödinger features combined in a special two-band Hamiltonian describing the quasiparticles similar to the low-energy excitations in phosphorene. As a result, even scalar isotropic disorder scattering alters the nature of the carriers and results in anisotropic transport. Solving the Boltzmann equation exactly for such carriers with point-like random impurities we find a hidden knob to control the anisotropy just by tuning either the Fermi energy or temperature. Our results are expected to be generally applicable beyond the model studied here, and should stimulate further search for the alternative ways to control electron transport in advanced materials.
References in corpus (12)
- The electronic properties of graphene
- 2D materials and van der Waals heterostructures
- Boron nitride substrates for high-quality graphene electronics
- Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
- The Valley Hall Effect in MoS2 Transistors
- A self-consistent theory for graphene transport
- Quasiparticle band structure and tight-binding model for single- and bilayer black phosphorus
- Large Unidirectional Magnetoresistance in a Magnetic Topological Insulator
- Stability of boron nitride bilayers: Ground state energies, interlayer distances, and tight-binding description
- Anisotropic current-induced spin accumulation in the two-dimensional electron gas with spin-orbit coupling
- Thermoelectric transport in monolayer phosphorene
- Finite Conductivity Minimum in Bilayer Graphene without Charge Inhomogeneities