Vanishing of Cyclotron Resonance in Correlated 2D Electron Systems

TL;DR

This paper reports the experimental discovery of a cyclotron resonance vanishing effect in high-mobility GaAs/AlGaAs 2D electron systems, revealing new correlated electron states with potential for advanced THz detectors.

Contribution

It introduces the CR-vanishing effect in 2DES, a phenomenon independent of incident THz power, and discusses its relation to correlated electron states.

Findings

CR-vanishing effect appears as a gap on CR-line

CRV is independent of incident THz power

Correlated electron states may cause CRV

Abstract

Experimental measurements of photoresistivity under terahertz (THz) radiation in low magnetic fields at conditions of cyclotron resonance (CR) in two-dimensional electron system (2DES) of GaAs/AlGaAs nanostructures are presented and discussed. We report the experimental discovery of CR-vanishing effect (CRV) in GaAs/AlGaAs heterostructures with high mobility as a well-defined gap on CR-line that is independent on incident THz power. Our analysis shows that the CRV may appear in systems with well correlated state of 2D electrons such as plasma waves and others. Fundamental nature of these correlated states of electrons in 2DES is discussed. Future THz detectors utilizing the new correlated states in 2DES may expand horizons for supersensitive and selective detectors in sub-THz and THz frequencies ranges.