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Polaron spectroscopy of a bilayer excitonic insulator

Recent advances in fabrication of two-dimensional materials and their moiré heterostructures have opened up new avenues for realization of ground-state excitonic insulators, where the structure spontaneously develops a finite interlayer electronic polarization. We propose and analyze a scheme where...

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Bibliographic Details
Main Authors: Amelio, Ivan (Author) , Drummond, N. D. (Author) , Demler, Eugene (Author) , Schmidt, Richard (Author) , Imamoglu, Atac (Author)
Format: Article (Journal)
Language:English
Published: 11 April 2023
In: Physical review
Year: 2023, Volume: 107, Issue: 15, Pages: 1-8
ISSN:2469-9969
DOI:10.1103/PhysRevB.107.155303
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevB.107.155303
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevB.107.155303
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Author Notes:Ivan Amelio, N.D. Drummond, Eugene Demler, Richard Schmidt, and Atac Imamoglu
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Summary:Recent advances in fabrication of two-dimensional materials and their moiré heterostructures have opened up new avenues for realization of ground-state excitonic insulators, where the structure spontaneously develops a finite interlayer electronic polarization. We propose and analyze a scheme where an optically generated intralayer exciton is screened by excitations out of the excitonic insulator to form interlayer polarons. Using quantum Monte Carlo calculations we first determine the binding energy of the biexciton state composed of inter- and intralayer excitons, which plays a central role in understanding polaron formation. We describe the excitations out of the ground-state condensate using BCS theory and use a single interacting-quasiparticle-pair excitation Ansatz to describe dynamical screening of optical excitations. Our predictions carry the hallmarks of the excitonic insulator excitation spectrum and show how changing the interlayer exciton binding energy by increasing the layer separation modifies the optical spectra.
Item Description:Gesehen am 19.05.2023
Physical Description:Online Resource
ISSN:2469-9969
DOI:10.1103/PhysRevB.107.155303

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