Nonlinear spectroscopy of semiconductor moiré materials
- URL: http://arxiv.org/abs/2402.16630v2
- Date: Thu, 1 Aug 2024 14:41:28 GMT
- Title: Nonlinear spectroscopy of semiconductor moiré materials
- Authors: B. Evrard, H. S. Adlong, A. A. Ghita, T. Uto, L. Ciorciaro, K. Watanabe, T. Taniguchi, M. Kroner, A. İmamoğlu,
- Abstract summary: We use time-resolved nonlinear pump--probe measurements to reveal features of semiconductor moir'e materials.
We generate a high density of virtual excitons or exciton--polarons in various moir'e minibands.
- Score: 0.0
- License: http://creativecommons.org/licenses/by-nc-sa/4.0/
- Abstract: We use time-resolved nonlinear pump--probe measurements to reveal features of semiconductor moir\'e materials not accessible to linear spectroscopy. With an intense, red-detuned pump pulse, we generate a high density of virtual excitons or exciton--polarons in various moir\'e minibands. A broadband probe pulse in turn measures the response of all optical resonances induced by the pump-generated excitations. We generically observe a coherent blue shift originating from contact-like exciton--exciton interactions. At charge neutrality, these measurements allow us to assess the spatial overlap between different optical excitations and to observe signatures of a bound biexciton state between two different moir\'e exciton modes. In contrast to electron doped monolayers, spatially confined moir\'e attractive polarons behave as an ensemble of non-interacting two-level emitters, exhibiting an electron-density-independent ac-Stark effect. Tuning the pump laser into resonance with the attractive polaron, we demonstrate the filling of the moir\'e lattice with localized polarons and thereby realize a nonequilibrium Bose--Fermi mixture in moir\'e flat bands.
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