Quantum geometry induced anomalous chiral transport and hidden symmetry breaking in centrosymmetric 2M-WS2
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2026
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| author | Cui, Hang Liu, Shao-Bo Wang, Erqing Pan, Mingxiang Fang, Yuqiang Ma, Ning Liu, Wenlong Chen, Di Zhang, Yu Song, Yuanjun Hao, Tingting Li, Jiankun Cui, Jian Feng, Ya Liu, Haiwen Huang, Fuqiang Huang, Huaqing Xie, X. -C. Chen, Jian-Hao |
| author_facet | Cui, Hang Liu, Shao-Bo Wang, Erqing Pan, Mingxiang Fang, Yuqiang Ma, Ning Liu, Wenlong Chen, Di Zhang, Yu Song, Yuanjun Hao, Tingting Li, Jiankun Cui, Jian Feng, Ya Liu, Haiwen Huang, Fuqiang Huang, Huaqing Xie, X. -C. Chen, Jian-Hao |
| contents | Chirality, a widely existing material property in nature involving the breaking of the left-right symmetry, has profound influences in various fields of natural sciences. Nonlinear response, such as electronic magnetochiral anisotropy (eMChA), has been recognized as a sensitive probe for the effects of symmetry breaking and nontrivial quantum geometries in solids. So far, observations of eMChA have primarily been limited to inversion-symmetry broken materials. Here, we report a remarkable chiral transport in centrosymmetric candidate topological superconductor 2M-WS2 flakes observed via second-harmonic generation under an out-of-plane magnetic field. More importantly, the eMChA becomes significant around the crossover temperature TFL ~ 25 K from the Fermi liquid (FL) to strange metal (SM) in the normal state, which interestingly echoes with the anomalously large Nernst response at the same temperature in bulk 2M-WS2. These observations reveal a direct correspondence between the nonlinear response, Nernst response, and FL-SM transition in 2M-WS2. Theoretical analysis indicates that nontrivial quantum geometry is behind the simultaneous response of eMChA and Nernst effects in 2M-WS2 and the contribution from the orbital magnetic moment at the Fermi surface becomes significant during the FL-SM transition. Based on first-principles calculations, a thick-layer-sliding mechanism with minimal energy gain in 2M-WS2 provides one possibility for the generation of such nontrivial quantum geometry. The intertwined physics of remarkable eMChA, Nernst response, and FL-SM transition make 2M-WS2 a rare quantum platform to study the chiral transport and unexplored phenomena in strange metals, which may shed light on the trans-century, unresolved scientific issue in unconventional high-temperature superconductivity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_18277 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Quantum geometry induced anomalous chiral transport and hidden symmetry breaking in centrosymmetric 2M-WS2 Cui, Hang Liu, Shao-Bo Wang, Erqing Pan, Mingxiang Fang, Yuqiang Ma, Ning Liu, Wenlong Chen, Di Zhang, Yu Song, Yuanjun Hao, Tingting Li, Jiankun Cui, Jian Feng, Ya Liu, Haiwen Huang, Fuqiang Huang, Huaqing Xie, X. -C. Chen, Jian-Hao Strongly Correlated Electrons Superconductivity Chirality, a widely existing material property in nature involving the breaking of the left-right symmetry, has profound influences in various fields of natural sciences. Nonlinear response, such as electronic magnetochiral anisotropy (eMChA), has been recognized as a sensitive probe for the effects of symmetry breaking and nontrivial quantum geometries in solids. So far, observations of eMChA have primarily been limited to inversion-symmetry broken materials. Here, we report a remarkable chiral transport in centrosymmetric candidate topological superconductor 2M-WS2 flakes observed via second-harmonic generation under an out-of-plane magnetic field. More importantly, the eMChA becomes significant around the crossover temperature TFL ~ 25 K from the Fermi liquid (FL) to strange metal (SM) in the normal state, which interestingly echoes with the anomalously large Nernst response at the same temperature in bulk 2M-WS2. These observations reveal a direct correspondence between the nonlinear response, Nernst response, and FL-SM transition in 2M-WS2. Theoretical analysis indicates that nontrivial quantum geometry is behind the simultaneous response of eMChA and Nernst effects in 2M-WS2 and the contribution from the orbital magnetic moment at the Fermi surface becomes significant during the FL-SM transition. Based on first-principles calculations, a thick-layer-sliding mechanism with minimal energy gain in 2M-WS2 provides one possibility for the generation of such nontrivial quantum geometry. The intertwined physics of remarkable eMChA, Nernst response, and FL-SM transition make 2M-WS2 a rare quantum platform to study the chiral transport and unexplored phenomena in strange metals, which may shed light on the trans-century, unresolved scientific issue in unconventional high-temperature superconductivity. |
| title | Quantum geometry induced anomalous chiral transport and hidden symmetry breaking in centrosymmetric 2M-WS2 |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2605.18277 |