Phase transitions in the two-dimensional electron-hole gas
arXiv:1310.4612 · doi:10.1016/j.physe.2015.03.016
Abstract
A first order phase transition between a BCS phase and an insulating Mott phase for a gas of spatially separated electrons and holes with tunable Coulomb interaction and variable density is predicted. In the framework of a BCS-like mean-field approach and a Landau expansion in terms of the pairing order parameter the phase diagram is studied. This indicates several phases and phase transitions, including an electron-hole plasma at low density and weak interaction, an intermediate BCS phase with Cooper pairs and an electron-hole plasma at high density and weak interaction. The insulating Mott phase appears for the strong interaction and low temperatures. We briefly discuss the possibilities to realize these phases in realistic systems such as coupled quantum wells and graphene double layers.
10 pages, 4 figures
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- Electron-hole superfluidity controlled by a periodic potential
- Charge-separated electron-hole liquid in transition metal dichalcogenide heterostructures
- Interaction-driven capacitance in Graphene electron-hole double layer in the quantum Hall regime
- Sensitive linear response of an electron-hole superfluid in a periodic potential
- Short note on the excitonic Mott phase