Cyclotron resonance in a two-dimensional electron gas with long-range randomness

TL;DR

This paper investigates how the cyclotron resonance in a 2D electron gas behaves under long-range disorder, revealing distinct lineshapes and a sudden linewidth collapse at certain magnetic field transitions.

Contribution

It uncovers the non-trivial effects of long-range disorder on cyclotron resonance, including multiple lineshape regimes and a sharp linewidth transition.

Findings

Different lineshape forms in strong, intermediate, and weak magnetic fields.

Linewidth collapse at the transition from intermediate to weak fields.

Explosive growth in diffusive electron dynamics at the transition.

Abstract

We show that the the cyclotron resonance in a two-dimensional electron gas has non-trivial properties if the correlation length of the disorder is larger than the de Broglie wavelength: (a) the lineshape assumes three different forms in strong, intermediate, and weak magnetic fields (b) at the transition from the intermediate to the weak fields the linewidth suddenly collapses due to an explosive growth in the fraction of electrons with a diffusive-type dynamics.