Condensation signatures of photogenerated interlayer excitons in a van
der Waals heterostack
- URL: http://arxiv.org/abs/2001.07567v1
- Date: Tue, 21 Jan 2020 14:29:43 GMT
- Title: Condensation signatures of photogenerated interlayer excitons in a van
der Waals heterostack
- Authors: Lukas Sigl, Florian Sigger, Fabian Kronowetter, Jonas Kiemle, Julian
Klein, Kenji Watanabe, Takashi Taniguchi, Jonathan J. Finley, Ursula
Wurstbauer, and Alexander W. Holleitner
- Abstract summary: Atomistic van der Waals heterostacks are ideal systems for high-temperature exciton condensation.
Our study provides a first phase-diagram of many-body interlayer exciton states including Bose Einstein condensation.
- Score: 46.1292414445895
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Atomistic van der Waals heterostacks are ideal systems for high-temperature
exciton condensation because of large exciton binding energies and long
lifetimes. Charge transport and electron energy-loss spectroscopy showed first
evidence of excitonic many-body states in such two-dimensional materials. Pure
optical studies, the most obvious way to access the phase diagram of
photogenerated excitons have been elusive. We observe several criticalities in
photogenerated exciton ensembles hosted in MoSe2-WSe2 heterostacks with respect
to photoluminescence intensity, linewidth, and temporal coherence pointing
towards the transition to a coherent quantum state. For this state, the
occupation is 100 percent and the exciton diffusion length is increased. The
phenomena survive above 10 kelvin, consistent with the predicted critical
condensation temperature. Our study provides a first phase-diagram of many-body
interlayer exciton states including Bose Einstein condensation.
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