Virial expansion for the optical response of doped two-dimensional
semiconductors
- URL: http://arxiv.org/abs/2212.05627v1
- Date: Sun, 11 Dec 2022 23:30:29 GMT
- Title: Virial expansion for the optical response of doped two-dimensional
semiconductors
- Authors: B. C. Mulkerin, A. Tiene, F. M. Marchetti, M. M. Parish, and J.
Levinsen
- Abstract summary: We present a quantum virial expansion for the optical response of a doped two-dimensional semiconductor.
The virial expansion predicts new features of the photoluminescence, such as a non-perturbative shape of the attractive branch related to universal low-energy exciton-electron scattering.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We present a quantum virial expansion for the optical response of a doped
two-dimensional semiconductor. As we show, this constitutes a perturbatively
exact theory in the high-temperature or low-doping regime, where the electrons'
thermal wavelength is smaller than their interparticle spacing. The virial
expansion predicts new features of the photoluminescence, such as a non-trivial
shape of the attractive branch related to universal low-energy exciton-electron
scattering and an associated shift of the attractive peak from the trion
energy. Our results are in excellent agreement with recent experiments on doped
monolayer MoSe2 [Zipfel et al., Phys. Rev. B 105, 075311 (2022)] and they imply
that the trion binding energy is likely to have been overestimated in previous
measurements. Our theory furthermore allows us to formally unify two distinct
theoretical pictures that have been applied to this system, with the
conventional trion picture results emerging as a high-temperature and
weak-interaction limit of Fermi polaron theory.
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