Bosonic condensation of exciton–polaritons in an atomically thin crystal

Carlos Anton-Solanas, Maximilian Waldherr, Martin Klaas, Holger Suchomel, Tristan H. Harder, Hui Cai, Evgeny Sedov, Sebastian Klembt, Alexey V. Kavokin, Sefaattin Tongay, Kenji Watanabe, Takashi Taniguchi, Sven Höfling, Christian Schneider

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

The emergence of two-dimensional crystals has revolutionized modern solid-state physics. From a fundamental point of view, the enhancement of charge carrier correlations has sparked much research activity in the transport and quantum optics communities. One of the most intriguing effects, in this regard, is the bosonic condensation and spontaneous coherence of many-particle complexes. Here we find compelling evidence of bosonic condensation of exciton–polaritons emerging from an atomically thin crystal of MoSe2 embedded in a dielectric microcavity under optical pumping at cryogenic temperatures. The formation of the condensate manifests itself in a sudden increase of luminescence intensity in a threshold-like manner, and a notable spin-polarizability in an externally applied magnetic field. Spatial coherence is mapped out via highly resolved real-space interferometry, revealing a spatially extended condensate. Our device represents a decisive step towards the implementation of coherent light-sources based on atomically thin crystals, as well as non-linear, valleytronic coherent devices.

Original languageEnglish
Pages (from-to)1233-1239
Number of pages7
JournalNature Materials
Volume20
Issue number9
DOIs
StatePublished - Sep 2021

Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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