Spin degree of freedom in two dimensional exciton condensates

TL;DR

This paper provides a theoretical analysis of spin-dependent properties in two-dimensional exciton condensates, exploring how spin polarization affects energy, chemical potential, and phase behavior in different configurations.

Contribution

It introduces a detailed theoretical model for spin-dependent exciton condensates, highlighting the impact of spin polarization and electron-hole separation on their phase diagram.

Findings

Energy and chemical potentials depend strongly on spin polarization.

Condensate can be totally spin polarized or unpolarized depending on system parameters.

Phase diagram varies with total density and electron-hole separation.

Abstract

We present a theoretical analysis of a spin-dependent multicomponent condensate in two dimensions. The case of a condensate of resonantly photoexcited excitons having two different spin orientations is studied in detail. The energy and the chemical potentials of this system depend strongly on the spin polarization . When electrons and holes are located in two different planes, the condensate can be either totally spin polarized or spin unpolarized, a property that is measurable. The phase diagram in terms of the total density and electron-hole separation is discussed.