# Towards superfluidity of dipolar excitons in a TMDC double layer

## TL;DR

This paper investigates the formation and superfluidity of dipolar excitons in TMDC double layers, deriving analytical expressions for their energy spectrum and critical temperature, highlighting the importance of screening effects.

## Contribution

It provides analytical models for exciton energies and superfluid transition temperatures considering screening effects in TMDC heterostructures, advancing understanding of excitonic superfluidity.

## Key findings

- Binding energies of A excitons are larger than B excitons.
- Critical temperature increases with the factor Q related to exciton masses.
- Screening effects significantly influence superfluid transition temperatures.

## Abstract

We study formation and superfluidity of dipolar excitons in double layer heterostructures formed by two transition metal dichalcogenide (TMDC) atomically thin layers. Considering screening effects for an electron-hole interaction via the harmonic oscillator approximation for the Keldysh potential, the analytical expressions for the exciton energy spectrum and the mean field critical temperature $T_{c}$ for the superfluidity are obtained. It is shown that binding energies of A excitons are larger than for B excitons. The mean field critical temperature for a two-component dilute exciton system in a TMDC double layer is analyzed and shown that latter is an increasing function of the factor $Q$, determined by the effective masses of A and B excitons and their reduced mass. Comparison of the calculations for $T_{c}$ performed by employing the Coulomb and Keldysh interactions demonstrates the importance of screening effects in TMDC.