Far-infrared photo-conductivity of electrons in an array of nano-structured antidots

TL;DR

This study investigates how far-infrared radiation affects electron behavior in a nano-structured antidot array, revealing resonant collective excitations and the influence of spin and phonon effects on these modes.

Contribution

It provides the first detailed spectral and resistive analysis of magnetoplasmon and edge-magnetoplasmon modes in antidot lattices, including temperature and spin effects.

Findings

Detection of magnetoplasmon and edge-magnetoplasmon modes

Temperature dependence shows modes heat the electron gas

Spin and phonon effects influence collective excitations

Abstract

We present far-infrared (FIR) photo-conductivity measurements for a two-dimensional electron gas in an array of nano-structured antidots. We detect, resistively and spectrally resolved, both the magnetoplasmon and the edge-magnetoplasmon modes. Temperature-dependent measurements demonstrates that both modes contribute to the photo resistance by heating the electron gas via resonant absorption of the FIR radiation. Influences of spin effect and phonon bands on the collective excitations in the antidot lattice are observed.