Terahertz Induced Photoconductivity of 2D Electron System in HEMT at Low Magnetic Field

TL;DR

This study investigates the photoconductivity of a 2D electron system in GaAs/GaAlAs heterostructures under low magnetic fields, revealing a novel 'CR-vanishing effect' indicating a new correlated electron state.

Contribution

First observation of the 'CR-vanishing effect' in 2DES at low magnetic fields, demonstrating a new correlated electron state not previously reported.

Findings

Discovery of 'CR-vanishing effect' as a crevasse on CR line

Vanishing longitudinal resistance and conductivity in low magnetic fields

Indication of a new correlated electron state in 2DES

Abstract

A few results of our study of two-dimensional electron system (2DES) in low magnetic fields in GaAs/GaAlAs heterostructures by cyclotron resonance (CR) and photoconductivity techniques are presented. We have first discovered "CR-vanishing effect"in 2DES as well-defined crevasse on CR line in low magnetic fields, when Hall resistance is not quantized. "CR-vanishing effect" indicates vanishing longitudinal resistance & conductivity in these magnetic fields. Observed "CR-vanishing effect" demonstrates new correlated state of electrons in 2DES.