Crystallization of an exciton superfluid

Abstract

Indirect excitons -- pairs of electrons and holes spatially separated in semiconductor bilayers or quantum wells -- are known to undergo Bose-Einstein condensation and to form a quantum fluid. Here we show that this superfluid may crystallize upon compression. However, further compression results in quantum melting back to a superfluid. This unusual behavior is explained by the effective interaction potential between indirect excitons which strongly deviates from a dipole potential at small distances due to many-particle and quantum effects. Based on first principle path integral Monte Carlo simulations, we compute the complete phase diagram of this system and predict the relevant parameters necessary to experimentally observe exciton crystallization in semiconductor quantum wells.

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• Nonlinear density response from imaginary-time correlation functions: Ab initio path integral Monte Carlo simulations of the warm dense electron gas
• Collective and single-particle excitations in 2D dipolar Bose gases
• Evidence for Exciton Crystals in a 2D Semiconductor Heterotrilayer
• Phase diagram of bilayer electron-hole plasmas
• Emerging supersolidity from a polariton condensate in a photonic crystal waveguide
• Chester supersolid of spatially indirect excitons in double-layer semiconductor heterostructures
• Quantum Breathing Mode of Interacting Particles in a One-dimensional Harmonic Trap
• Two-dimensional Bose gas of tilted dipoles: roton instability and condensate depletion
• Superfluidity of strongly correlated bosons in two- and three-dimensional traps
• Quantum phase transition of a two-dimensional quadrupolar system
• Roton-maxon spectrum and instability for weakly interacting dipolar excitons in a semiconductor layer
• Ab initio Path Integral Monte Carlo Simulations of Quantum Dipole Systems in Traps: Superfluidity, Quantum Statistics, and Structural Properties
• A comprehensive study of complex non-adiabatic exciton dynamics in MoSi${}_2$N${}_4$
• Evidence for a Superfluid-to-solid Transition of Bilayer Excitons
• Superfluid, solid, and supersolid phases of dipolar bosons in a quasi-one-dimensional optical lattice
• In memoriam Leonid V. Keldysh
• Nonequilibrium Green's function approach to the pair distribution function of quantum many-body systems out of equilibrium
• Effects of intra-layer correlations on electron-hole double-layer superfluidity
• Quantum metric driven transition between superfluid and incoherent fluid