A doping-dependent switch from one- to two-component superfluidity at temperature above 100K in coupled electron-hole Van der Waals heterostructures

TL;DR

This paper investigates high-temperature electron-hole superfluidity in coupled monolayers, revealing a doping-dependent transition from one- to two-component superfluidity with transition temperatures above 100K.

Contribution

It introduces a mean-field multiband model accounting for spin-orbit coupling effects, showing how doping controls superfluid component complexity and achieves high transition temperatures.

Findings

Superfluid transition temperatures exceed 100 K.

Doping controls the switch between one- and two-component superfluidity.

Strong electron-hole pairing is observed in the heterostructures.

Abstract

The hunt for high temperature superfluidity has received new impetus from the discovery of atomically thin stable materials. Electron-hole superfluidity in coupled MoSe2-WSe2 monolayers is investigated using a mean-field multiband model that includes the band splitting caused by the strong spin-orbit coupling. The splitting leads to a large energy misalignment of the electron and hole bands which can be markedly changed by interchanging the doping of the monolayers. The choice of doping determines if the superfluidity is tuneable from one- to two-components. The electron-hole pairing is strong, with high transition temperatures in excess of 100 K.