Bosonic Delocalization of Dipolar Moir\'e Excitons
- URL: http://arxiv.org/abs/2306.00465v1
- Date: Thu, 1 Jun 2023 09:06:33 GMT
- Title: Bosonic Delocalization of Dipolar Moir\'e Excitons
- Authors: Samuel Brem and Ermin Malic
- Abstract summary: tunable moir'e potentials emerge, trapping excitons into periodic arrays.
Recent experiments have demonstrated density-dependent transport properties of moir'e excitons.
We develop a microscopic theory of interacting excitons in external potentials.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: In superlattices of twisted semiconductor monolayers, tunable moir\'e
potentials emerge, trapping excitons into periodic arrays. In particular,
spatially separated interlayer excitons are subject to a deep potential
landscape and they exhibit a permanent dipole providing a unique opportunity to
study interacting bosonic lattices. Recent experiments have demonstrated
density-dependent transport properties of moir\'e excitons, which could play a
key role for technological applications. However, the intriguing interplay
between exciton-exciton interactions and moir\'e trapping has not been well
understood yet. In this work, we develop a microscopic theory of interacting
excitons in external potentials allowing us to tackle this highly challenging
problem. We find that interactions between moir\'e excitons lead to a
delocalization at intermediate densities and we show how this transition can be
tuned via twist angle and temperature. The delocalization is accompanied by a
modification of optical moir\'e resonances, which gradually merge into a single
free exciton peak. The predicted density-tunability of the supercell hopping
can be utilized to control the energy transport in moir\'e materials.
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