TY - JOUR
T1 - A Pair of 2D Quantum Liquids
T2 - Investigating the Phase Behavior of Indirect Excitons
AU - Wrona, Paul R.
AU - Rabani, Eran
AU - Geissler, Phillip L.
N1 - Publisher Copyright:
© 2022 American Chemical Society.
PY - 2022/9/27
Y1 - 2022/9/27
N2 - Long-lived indirect excitons (IXs) exhibit a rich phase diagram, including a Bose-Einstein condensate (BEC), a Wigner crystal, and other exotic phases. Recent experiments have hinted at a "classical"liquid of IXs above the BEC transition. To uncover the nature of this phase, we use a broad range of theoretical tools and find no evidence of a driving force toward classical condensation. Instead, we attribute the condensed phase to a quantum electron-hole liquid (EHL), first proposed by Keldysh for direct excitons. Taking into account the association of free carriers into bound excitons, we study the phase equilibrium between a gas of excitons, a gas of free carriers, and an EHL for a wide range of electron-hole separations, temperatures, densities, and mass ratios. Our results agree reasonably well with recent measurements of GaAs/AlGaAs coupled quantum wells.
AB - Long-lived indirect excitons (IXs) exhibit a rich phase diagram, including a Bose-Einstein condensate (BEC), a Wigner crystal, and other exotic phases. Recent experiments have hinted at a "classical"liquid of IXs above the BEC transition. To uncover the nature of this phase, we use a broad range of theoretical tools and find no evidence of a driving force toward classical condensation. Instead, we attribute the condensed phase to a quantum electron-hole liquid (EHL), first proposed by Keldysh for direct excitons. Taking into account the association of free carriers into bound excitons, we study the phase equilibrium between a gas of excitons, a gas of free carriers, and an EHL for a wide range of electron-hole separations, temperatures, densities, and mass ratios. Our results agree reasonably well with recent measurements of GaAs/AlGaAs coupled quantum wells.
KW - Mott transition
KW - coupled quantum wells
KW - electron-hole liquid
KW - indirect exciton
KW - phase transition
UR - http://www.scopus.com/inward/record.url?scp=85138123337&partnerID=8YFLogxK
U2 - 10.1021/acsnano.2c06947
DO - 10.1021/acsnano.2c06947
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C2 - 36069715
AN - SCOPUS:85138123337
SN - 1936-0851
VL - 16
SP - 15339
EP - 15346
JO - ACS Nano
JF - ACS Nano
IS - 9
ER -