Circular photogalvanic effect induced by near-infrared radiation in InAs quantum wires patterned quasi two-dimensional electron system

TL;DR

This study demonstrates the induction of the circular photogalvanic effect in InAs quantum wires using near-infrared radiation, revealing insights into spin-orbit interactions and symmetry effects in quasi-two-dimensional electron systems.

Contribution

It provides new experimental evidence of the circular photogalvanic effect in patterned InAs quantum wires and explores the evolution of spin-orbit coupling with structural variations.

Findings

Circular photogalvanic effect observed at room temperature.

The effect relates to the $C_{2v}$ symmetry of the structure.

Spin-orbit interaction varies with quantum wire layer thickness.

Abstract

In this work we investigated the InAs/InAlAs quantum wires (QWRs) superlattice by optically exciting the structure with near-infrared radiation. By varying the helicity of the radiation at room temperature we observed the circular photogalvanic effect related to the $C_{2v}$ symmetry of the structure, which could be attributed to the formation of a quasi two-dimensional system underlying in the vicinity of the QWRs pattern. The ratio of Rashba and Dresselhaus terms shows an evolution of the spin-orbit interaction in quasi two-dimensional structure with the QWR layer deposition thickness.