Valley polarized transport in strained graphene based Corbino disc

TL;DR

This paper investigates how uniaxial and inhomogeneous strain in graphene affects magnetotransport in a Corbino disk, revealing strain-dependent conductance oscillations and a valley polarized regime.

Contribution

It provides an analytical and numerical analysis of strain-induced effects on conductance and valley polarization in graphene Corbino devices, highlighting new control mechanisms.

Findings

Conductance oscillation period depends on uniaxial strain.

Conductance sharply drops along the strain direction.

A wide energy range exhibits full valley polarization.

Abstract

We study analytically and numerically the magnetotransport of strained graphene in a Corbino geometry gating in the presence of an external perpendicular magnetic field. The conductance of the Corbino disc of deformed graphene with a uniaxial and an inhomogeneous strain is calculated by using the Landauer-B\"{u}ttiker method. We show that the oscillation period of the conductance as a function of the magnetic flux depends on uniaxial strain and the conductance sharply drops along the direction of graphene stretching. The conductance amplitude, on the other hand, can be manipulated by induced pseudomagnetic flux. A valley polarized regime, caused by the inhomogeneous strain, is obtained and in addition we find a wide energy interval in which the system is fully valley polarized.