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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.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Excitons, optoelectronic devices, WSe2/WS2 moiré superlattices

Date published: 2024-05-18

Publisher: Springer Science and Business Media LLC

Journal:

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

Funding:

• National Science Foundation DMR-2337606

Manuscript type: Publisher's version (Version of record)

MDR DOI:

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

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Updated at: 2025-02-07 16:30:26 +0900

Published on MDR: 2025-02-07 16:30:26 +0900