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

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• Three-dimensional electron-hole superfluidity in a superlattice close to room temperature
• Biexciton-like quartet condensates in an electron-hole liquid
• Excitonic insulators and superfluidity in 2D bilayers without external fields
• Superfluidity of dipolar magnetoexcitons in doped double-layered $\alpha$-${\mathcal{T}}_3$ lattice in a strong magnetic field
• Superfluidity of dipolar excitons in a double layer of $\alpha -T_3$ with a mass term
• Exciton Superfluidity in 2D Heterostructures from First Principles: The importance of material specific screening
• Collective excitations and quantum incompressibility in electron-hole bilayers