Extremely imbalanced two-dimensional electron-hole-photon systems
Abstract
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.
Citation
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
Publication
Physical Review Research
Status
Peer reviewed
ISSN
2643-1564Type
Journal article
Description
Funding: 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).Collections
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