Probing Quantum Anomalous Hall States in Twisted Bilayer WSe2 via Attractive Polaron Spectroscopy
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2025
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| author | Gao, Beini Ghafariasl, Mahdi Mehrabad, Mahmoud Jalali Huang, Tsung-Sheng Zhang, Lifu Session, Deric Upadhyay, Pranshoo Ma, Rundong Alshalan, Ghadah Forero, Daniel Gustavo Suárez Sarkar, Supratik Park, Suji Jang, Houk Watanabe, Kenji Taniguchi, Takashi Xie, Ming Zhou, You Hafezi, Mohammad |
| author_facet | Gao, Beini Ghafariasl, Mahdi Mehrabad, Mahmoud Jalali Huang, Tsung-Sheng Zhang, Lifu Session, Deric Upadhyay, Pranshoo Ma, Rundong Alshalan, Ghadah Forero, Daniel Gustavo Suárez Sarkar, Supratik Park, Suji Jang, Houk Watanabe, Kenji Taniguchi, Takashi Xie, Ming Zhou, You Hafezi, Mohammad |
| contents | Moiré superlattices in semiconductors exhibit a rich variety of interaction-induced topological states, including quantum anomalous Hall (QAH) effects. A recent study hinted that twisted WSe2 homobilayer (tWSe2) could host a QAH state but lacked direct evidence of ferromagnetism, a key hallmark of this phase. Here, we report the first direct evidence of QAH states in tWSe2 with spontaneous ferromagnetism. Specifically, we employ polarization-resolved attractive polaron spectroscopy on a dual-gated, 2 degree tWSe2 and observe direct signatures of spontaneous time-reversal symmetry breaking at hole filling ν= 1. Together with a Chern number measurement via Streda formula analysis, we identify this magnetized state as a topological state, characterized by C = 1. Furthermore, we demonstrate that these topological and magnetic properties are tunable via a finite displacement field, between a QAH ferromagnetic state and an antiferromagnetic state. Our findings position tWSe2 as a highly versatile, stable, and optically addressable platform for investigating topological order and strong correlations in two-dimensional landscapes. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_11530 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Probing Quantum Anomalous Hall States in Twisted Bilayer WSe2 via Attractive Polaron Spectroscopy Gao, Beini Ghafariasl, Mahdi Mehrabad, Mahmoud Jalali Huang, Tsung-Sheng Zhang, Lifu Session, Deric Upadhyay, Pranshoo Ma, Rundong Alshalan, Ghadah Forero, Daniel Gustavo Suárez Sarkar, Supratik Park, Suji Jang, Houk Watanabe, Kenji Taniguchi, Takashi Xie, Ming Zhou, You Hafezi, Mohammad Strongly Correlated Electrons Mesoscale and Nanoscale Physics Materials Science Quantum Physics Moiré superlattices in semiconductors exhibit a rich variety of interaction-induced topological states, including quantum anomalous Hall (QAH) effects. A recent study hinted that twisted WSe2 homobilayer (tWSe2) could host a QAH state but lacked direct evidence of ferromagnetism, a key hallmark of this phase. Here, we report the first direct evidence of QAH states in tWSe2 with spontaneous ferromagnetism. Specifically, we employ polarization-resolved attractive polaron spectroscopy on a dual-gated, 2 degree tWSe2 and observe direct signatures of spontaneous time-reversal symmetry breaking at hole filling ν= 1. Together with a Chern number measurement via Streda formula analysis, we identify this magnetized state as a topological state, characterized by C = 1. Furthermore, we demonstrate that these topological and magnetic properties are tunable via a finite displacement field, between a QAH ferromagnetic state and an antiferromagnetic state. Our findings position tWSe2 as a highly versatile, stable, and optically addressable platform for investigating topological order and strong correlations in two-dimensional landscapes. |
| title | Probing Quantum Anomalous Hall States in Twisted Bilayer WSe2 via Attractive Polaron Spectroscopy |
| topic | Strongly Correlated Electrons Mesoscale and Nanoscale Physics Materials Science Quantum Physics |
| url | https://arxiv.org/abs/2504.11530 |