Terahertz radiation driven nonlinear transport phenomena in two-dimensional tellurene

TL;DR

This study investigates how polarized terahertz radiation induces nonlinear electron transport in two-dimensional tellurene at room temperature, revealing contributions from Berry curvature dipole and side-jump mechanisms that can be tuned by gate potential.

Contribution

It demonstrates the terahertz-driven nonlinear transport phenomena in tellurene and identifies the microscopic mechanisms responsible, with control via external gate potential.

Findings

Observation of a quadratic direct current induced by terahertz radiation.

Identification of contributions sensitive to radiation helicity and polarization.

Demonstration of modulation of currents by external gate potential.

Abstract

Nonlinear electron transport induced by polarized terahertz radiation is studied in two-dimensional tellurene at room temperature. A direct current, quadratic in the radiation's electric field, is observed. Contributions sensitive to radiation helicity, polarization orientation as well as polarization independent current are found. We show that these contributions can be modified by the magnitude of the external gate potential. We demonstrate that this terahertz-driven electric current arises from the Berry curvature dipole and the side-jump microscopic mechanisms.Nonlinear electron transport induced by polarized terahertz radiation is studied in two-dimensional tellurene at room temperature. A direct current, quadratic in the radiation's electric field, is observed. Contributions sensitive to radiation helicity, polarization orientation as well as polarization independent current are found. We show that these contributions can be modified by the magnitude of the external gate potential. We demonstrate that this terahertz-driven electric current arises from the Berry curvature dipole and the side-jump microscopic mechanisms.