Microwave-Induced Magneto-Intersubband Scattering in a Square Lattice of Antidots

TL;DR

This study explores how microwave radiation influences electron transport in a square antidot lattice with two subbands, revealing microwave-induced magneto-intersubband oscillations caused by increased intersubband scattering.

Contribution

It demonstrates microwave-induced magneto-intersubband oscillations in a square antidot lattice, linking them to intersubband scattering enhanced by electron heating differences.

Findings

Resistance oscillations occur only for the first subband.

Microwave irradiation under cyclotron resonance induces oscillations periodic in inverse magnetic field.

Oscillation period matches that of magneto-intersubband oscillations.

Abstract

The effect of microwave radiation on low-temperature electron magnetotransport in a square antidot lattice with a period of d = 0.8 micrometer based on a GaAs quantum well with two occupied energy subbands E1 and E2 is investigated. It is shown that, owing to a significant difference between the electron densities in the subbands, commensurability oscillations of the resistance in the investigated antidot lattice are observed only for the first subband. It is found that microwave irradiation under the cyclotron resonance condition results in the formation of resistance oscillations periodic in the inverse magnetic field in the region of the main commensurability peak. It is established that the period of these oscillations corresponds to the period of magneto-intersubband oscillations. The observed effect is explained by the increase in the rate of intersubband scattering caused by the difference between the electron heating in the subbands E1 and E2.