Effects of Fermion Flavor on Exciton Condensation in Double Layer Systems

TL;DR

This study uses quantum Monte Carlo simulations to explore how fermion flavor influences exciton condensation in double layer systems, revealing that additional flavors reduce screening effects and increase transition temperatures.

Contribution

It demonstrates the importance of including correlation effects in both interlayer and intralayer interactions for accurate modeling of exciton condensates.

Findings

Fermion flavor weakens effective interlayer interaction.

Including correlation is essential for correct screening description.

Higher transition temperatures are observed with more fermion flavors.

Abstract

We use fermionic path integral quantum Monte Carlo to study the effects of fermion flavor on the physical properties of dipolar exciton condensates in double layer systems. We find that by including spin in the system weakens the effective interlayer interaction strength, yet this has very little effect on the Kosterlitz-Thouless transition temperature. We further find that, to obtain the correct description of screening, it is necessary to account for correlation in both the interlayer and intralayer interactions. We show that while the excitonic binding cannot completely surpress screening by additional fermion flavors, their screening effectiveness is reduced leading to a much higher transition temperatures than predicted with large-N analysis.