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Excitons, which are Coulomb bound electron-hole pairs, are composite bosons and thus at low temperature can form a superfluid state with a single well-defined amplitude and phase. We directly image this macroscopic exciton superfluid state in an hBN-separated MoSe2-WSe2 heterostructure. At high density, we identify quasi-long-range order over the entire active area of our sample, through spatially resolved coherence measurements. By varying the exciton density and sample temperature, we map out the phase diagram of the superfluid. We observe the superfluid phase persisting to a temperature of 15 K, which is in excellent agreement with theoretical predictions. This works paves the way to realizing on chip superfluid structures capable of studying fundamental physical behaviors and quantum devices that use superfluidity. A two-dimensional gas of excitons transitions into a coherent superfluid.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Excitons, superfluid state, MoSe2-WSe2 heterostructure

刊行年月日: 2025-01-03

出版者: American Association for the Advancement of Science (AAAS)

掲載誌:

• Science Advances (ISSN: 23752548) vol. 11 issue. 1

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1126/sciadv.adr1772

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更新時刻: 2025-02-05 12:30:13 +0900

MDRでの公開時刻: 2025-02-05 12:30:14 +0900