Tunable exciton valley-pseudospin orders in moiré Bose-Hubbard model
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arXiv
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866929352038416384 |
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| author | Xiong, Richen Brantly, Samuel L. Su, Kaixiang Nie, Jacob H. Zhang, Zihan Banerjee, Rounak Ruddick, Hayley Watanabe, Kenji Taniguchi, Takashi Tongay, Sefaattin Xu, Cenke Jin, Chenhao |
| author_facet | Xiong, Richen Brantly, Samuel L. Su, Kaixiang Nie, Jacob H. Zhang, Zihan Banerjee, Rounak Ruddick, Hayley Watanabe, Kenji Taniguchi, Takashi Tongay, Sefaattin Xu, Cenke Jin, Chenhao |
| contents | Spin and charge are the two most important degrees of freedom of electrons. Their interplay lies at the heart of numerous strongly correlated phenomena including Hubbard model physics and high temperature superconductivity. Such interplay for bosons, on the other hand, is largely unexplored in condensed matter systems. Here we demonstrate a unique realization of the spin-1/2 Bose-Hubbard model through excitons in a semiconducting moiré superlattice. We find evidence of a transient in-plane ferromagnetic (FM-$xy$) order of exciton spin - here valley pseudospin - around exciton filling $ν_{ex}$ = 1, which transitions into a FM-$z$ order both with increasing exciton filling and a small magnetic field of 10 mT. The phase diagram is 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_18931 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Tunable exciton valley-pseudospin orders in moiré Bose-Hubbard model Xiong, Richen Brantly, Samuel L. Su, Kaixiang Nie, Jacob H. Zhang, Zihan Banerjee, Rounak Ruddick, Hayley Watanabe, Kenji Taniguchi, Takashi Tongay, Sefaattin Xu, Cenke Jin, Chenhao Mesoscale and Nanoscale Physics Materials Science Strongly Correlated Electrons Quantum Physics Spin and charge are the two most important degrees of freedom of electrons. Their interplay lies at the heart of numerous strongly correlated phenomena including Hubbard model physics and high temperature superconductivity. Such interplay for bosons, on the other hand, is largely unexplored in condensed matter systems. Here we demonstrate a unique realization of the spin-1/2 Bose-Hubbard model through excitons in a semiconducting moiré superlattice. We find evidence of a transient in-plane ferromagnetic (FM-$xy$) order of exciton spin - here valley pseudospin - around exciton filling $ν_{ex}$ = 1, which transitions into a FM-$z$ order both with increasing exciton filling and a small magnetic field of 10 mT. The phase diagram is 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. |
| title | Tunable exciton valley-pseudospin orders in moiré Bose-Hubbard model |
| topic | Mesoscale and Nanoscale Physics Materials Science Strongly Correlated Electrons Quantum Physics |
| url | https://arxiv.org/abs/2404.18931 |