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Spin and charge are the two most important degrees of freedom (DOF) of electrons. Their interplay lies at the heart of numerous strongly correlated phenomena including Hubbard model physics and high temperature superconductivity1,2. Such interplay for bosons, on the other hand, is largely unexplored in condensed matter systems. Here we demonstrate a unique realization of spin-½ Bose Hubbard model through excitons in a semiconducting moiré superlattice. Our observation suggests a transient FM-xy order of exciton “spin” – here valley pseudospin -- around vex = 1, which transitions into an FM-z order both with increasing exciton filling and a small magnetic field of ~10 mT. The phase diagram is distinctively different from the fermion case and is qualitatively captured by a simple phenomenological model, highlighting the unique consequence of Bose-Einstein statistics. Our study paves the way for engineering exotic phases of matter from spinor bosons, as well as for unconventional devices in optics and quantum information science.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Excitons, optoelectronic devices, WSe2/WS2 moiré superlattices

刊行年月日: 2024-05-18

出版者: Springer Science and Business Media LLC

掲載誌:

• Nature Communications (ISSN: 20411723) vol. 15 issue. 1 4254

研究助成金:

• National Science Foundation DMR-2337606

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1038/s41467-024-48725-z

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更新時刻: 2025-02-07 16:30:26 +0900

MDRでの公開時刻: 2025-02-07 16:30:26 +0900