Extremely imbalanced two-dimensional electron-hole-photon systems
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We investigate the phases of two-dimensional electron-hole systems strongly coupled to a microcavity photon field in the limit of extreme charge imbalance. Using variational wave functions, we examine the competition between different electron-hole paired states for the specific cases of semiconducting III-V single quantum wells, electron-hole bilayers, and transition metal dichalcogenide monolayers embedded in a planar microcavity. We show how the Fermi sea of excess charges modifies both the electron-hole bound state (exciton) properties and the dielectric constant of the cavity active medium, which in turn affects the photon component of the many-body polariton ground state. On the one hand, long-range Coulomb interactions and Pauli blocking of the Fermi sea promote electron-hole pairing with finite center-of-mass momentum, corresponding to an excitonic roton minimum. On the other hand, the strong coupling to the ultra-low-mass cavity photon mode favors zero-momentum pairs. We discuss the prospect of observing different types of electron-hole pairing in the photon spectrum.
Tiene , A , Levinsen , J , Parish , M M , MacDonald , A H , Keeling , J & Marchetti , F M 2020 , ' Extremely imbalanced two-dimensional electron-hole-photon systems ' , Physical Review Research , vol. 2 , no. 2 , 023089 . https://doi.org/10.1103/PhysRevResearch.2.023089
Physical Review Research
Copyright © 2020 The Author(s). Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
DescriptionFunding: AHM and JK acknowledge financial support from a Royal Society International Exchange Award, IES\R2\170213. JK acknowledges financial support from EPSRC program “Hybrid Polaritonics” (EP/M025330/1).
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