The Structure and Dispersion of Exciton-Trion-Polaritons in Two-Dimensional Materials: Experiments and Theory

Koksal, Okan; Jung, Minwoo; Manolatou, Christina; Vamivakas, A. Nick; Shvets, Gennady; Rana, Farhan

doi:10.48550/arxiv.2101.02070

Cited by 1 publication

(2 citation statements)

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“…The oscillator strengths and linewidths of these different branches have consequences for the polariton spectrum found when there is strong matter-light coupling [4,[7][8][9][10]. We show how the system's spectral properties in the weak-coupling limit determine the polariton spectrum in strong coupling.…”

Section: Introductionmentioning

confidence: 89%

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Effect of fermion indistinguishability on optical absorption of doped two-dimensional semiconductors

Tiene,

Levinsen,

Keeling

et al. 2021

Preprint

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We study the optical absorption spectrum of a doped two-dimensional semiconductor in the spinvalley polarized limit. In this configuration, the carriers in the Fermi sea are indistinguishable from one of the two carriers forming the exciton. Most notably, this indistinguishability requires the three-body trion state to have p-wave symmetry. To explore the consequences of this, we evaluate the system's optical properties within a polaron description, which can interpolate from the low density limit-where the relevant excitations are few-body bound states-to higher density manybody states. In the parameter regime where the trion is bound, we demonstrate that the spectrum is characterized by an attractive quasiparticle branch, a repulsive branch, and a many-body continuum, and we evaluate the doping dependence of the corresponding energies and spectral weights. In particular, at low doping we find that the oscillator strength of the attractive branch scales with the square of the Fermi energy as a result of the trion's p-wave symmetry. Upon increasing density, we find that both the repulsive and attractive branches blueshift, and that the orbital character of the states associated with these branches interchanges. We compare our results with previous investigations of the scenario where the Fermi sea involves carriers distinguishable from those in the exciton, for which the trion ground state is s-wave.

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Section: Introductionmentioning

confidence: 89%

“…This leads to absorption peaks that, in the limit of vanishing doping, connect smoothly to the underlying exciton and trion few-body states. Exciton-polarons have recently generated significant interest since they have been used to interpret the absorption peaks of charge-doped two-dimensional (2D) semiconductors [4,[7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%