Stoner instabilities and Ising excitonic states in twisted transition metal dichalcogenides
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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866914813843603456 |
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| author | Ghiotto, Augusto Wei, LingNan Song, Larry Zang, Jiawei Tazi, Aya Batoul Ostrom, Daniel Watanabe, Kenji Taniguchi, Takashi Hone, James C. Rhodes, Daniel A. Millis, Andrew J. Dean, Cory R. Wang, Lei Pasupathy, Abhay N. |
| author_facet | Ghiotto, Augusto Wei, LingNan Song, Larry Zang, Jiawei Tazi, Aya Batoul Ostrom, Daniel Watanabe, Kenji Taniguchi, Takashi Hone, James C. Rhodes, Daniel A. Millis, Andrew J. Dean, Cory R. Wang, Lei Pasupathy, Abhay N. |
| contents | Moiré transition metal dichalcogenide (TMD) systems provide a tunable platform for studying electron-correlation driven quantum phases. Such phases have so far been found at rational fillings of the moiré superlattice, and it is believed that lattice commensurability plays a key role in their stability. In this work, we show via magnetotransport measurements on twisted WSe2 that new correlated electronic phases can exist away from commensurability. The first phase is an antiferromagnetic metal that is driven by proximity to the van Hove singularity. The second is a re-entrant magnetic field-driven insulator. This insulator is formed from a small and equal density of electrons and holes with opposite spin projections - an Ising excitonic insulator. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_17316 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Stoner instabilities and Ising excitonic states in twisted transition metal dichalcogenides Ghiotto, Augusto Wei, LingNan Song, Larry Zang, Jiawei Tazi, Aya Batoul Ostrom, Daniel Watanabe, Kenji Taniguchi, Takashi Hone, James C. Rhodes, Daniel A. Millis, Andrew J. Dean, Cory R. Wang, Lei Pasupathy, Abhay N. Strongly Correlated Electrons Mesoscale and Nanoscale Physics Moiré transition metal dichalcogenide (TMD) systems provide a tunable platform for studying electron-correlation driven quantum phases. Such phases have so far been found at rational fillings of the moiré superlattice, and it is believed that lattice commensurability plays a key role in their stability. In this work, we show via magnetotransport measurements on twisted WSe2 that new correlated electronic phases can exist away from commensurability. The first phase is an antiferromagnetic metal that is driven by proximity to the van Hove singularity. The second is a re-entrant magnetic field-driven insulator. This insulator is formed from a small and equal density of electrons and holes with opposite spin projections - an Ising excitonic insulator. |
| title | Stoner instabilities and Ising excitonic states in twisted transition metal dichalcogenides |
| topic | Strongly Correlated Electrons Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2405.17316 |