Magnetization of ballistic quantum dots induced by a linear-polarized microwave field

TL;DR

This paper demonstrates that a linearly polarized microwave field can induce a significant stationary magnetization in mesoscopic ballistic quantum dots, with potential for experimental observation and implications for nanostructure ratchets.

Contribution

The study reveals a novel effect where microwave fields induce magnetization in quantum dots, supported by analytical and numerical evidence, expanding understanding of mesoscopic magnetic phenomena.

Findings

Magnetization is proportional to electron number and microwave power.

Magnetization exceeds that from persistent currents by several orders of magnitude.

Effect is weakly temperature-dependent and experimentally observable.

Abstract

On a basis of extensive analytical and numerical studies we show that a linear-polarized microwave field creates a stationary magnetization in mesoscopic ballistic quantum dots with two-dimensional electron gas being at a thermal equilibrium. The magnetization is proportional to a number of electrons in a dot and to a microwave power. Microwave fields of moderate strength create in a one dot of few micron size a magnetization which is by few orders of magnitude larger than a magnetization produced by persistent currents. The effect is weakly dependent on temperature and can be observed with existing experimental techniques. The parallels between this effect and ratchets in asymmetric nanostructures are also discussed.