Nonequilibrium phase transitions in a quasi-two-dimensional superlattice with parabolic miniband

TL;DR

This paper investigates nonequilibrium phase transitions in quasi-two-dimensional superlattices with paraboloidal minibands, revealing a spontaneous transverse electric field emergence as temperature increases, supported by theoretical calculations and experimental data.

Contribution

It introduces a theoretical analysis of phase transitions in quasi-two-dimensional superlattices with paraboloidal minibands, highlighting a novel spontaneous transverse electric field phenomenon.

Findings

Current dependence on temperature matches experimental data.

A spontaneous transverse electric field appears with rising temperature.

The study generalizes from 1D to quasi-2D superlattices.

Abstract

Distribution function and current density in a one-dimensional superlattice with parabolic miniband are calculated. The current dependence on the temperature coincides with experimental data. Generalization is carried out to quasi-two-dimensional superlattice with paraboloidal miniband. For a sample opened in Y direction with dc current in X direction, a novel nonequilibrium phase transition is found, namely, appearing a spontaneous transverse electric field under temperature rising.