Saved in:
| Main Authors: | , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2512.08373 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866917134218559488 |
|---|---|
| author | Sun, Xiaodong Qiao, Jiabin Li, Yuanzhe He, Wanli Chen, Jiali Liu, Jinjin Chen, Yuxiang Ma, Yuchen Jin, Meiling Luo, Jianlin Chen, Jie Wu, Wei Wang, Zhiwei Jiang, Wei Li, Xiang Yao, Yugui |
| author_facet | Sun, Xiaodong Qiao, Jiabin Li, Yuanzhe He, Wanli Chen, Jiali Liu, Jinjin Chen, Yuxiang Ma, Yuchen Jin, Meiling Luo, Jianlin Chen, Jie Wu, Wei Wang, Zhiwei Jiang, Wei Li, Xiang Yao, Yugui |
| contents | We report disorder-mediated first-order linear and higher-order nonlinear (magneto-)transport of Ta$_2$NiSe$_7$ (TNS) in the charge-density-wave (CDW) regime. CDW transition temperature ($T_{CDW}$) and carrier density are proportional and inversely proportional to residual resistance ratio of samples, respectively. Such relation helps to understand the unique CDW order therein. High-$T_{CDW}$ TNS exhibits negative first-harmonic magnetoresistance (MR$^{1ω}$) under a magnetic field ($B$) parallel to the direction of alternating current ($I^ω$), which may arise from the anomalous velocity induced by the Berry curvature of three-dimensional topological bands near the Fermi level. As $T_{CDW}$ drops, a positive-to-negative MR$^{1ω}$ transition is observed with decreasing perpendicular $B$, which is likely due to the contribution of Zeeman effect on current pathways in the disordered system. Moreover, interestingly, the second-harmonic nonlinear signals are suppressed, while the third-harmonic signals are significant and sensitive to both $B$ and $T_{CDW}$. Such observations, together with scaling analysis, suggest the quantum geometry quadrupole at play and the modulation of disorder on third-order nonlinearity. Our results pave an avenue for tailoring distinct-order magnetoresistive phases in disordered topological materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_08373 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Disorder-mediated linear and nonlinear magnetotransport in the charge-density-wave material ${\rm Ta_2NiSe_7 }$ Sun, Xiaodong Qiao, Jiabin Li, Yuanzhe He, Wanli Chen, Jiali Liu, Jinjin Chen, Yuxiang Ma, Yuchen Jin, Meiling Luo, Jianlin Chen, Jie Wu, Wei Wang, Zhiwei Jiang, Wei Li, Xiang Yao, Yugui Materials Science Mesoscale and Nanoscale Physics We report disorder-mediated first-order linear and higher-order nonlinear (magneto-)transport of Ta$_2$NiSe$_7$ (TNS) in the charge-density-wave (CDW) regime. CDW transition temperature ($T_{CDW}$) and carrier density are proportional and inversely proportional to residual resistance ratio of samples, respectively. Such relation helps to understand the unique CDW order therein. High-$T_{CDW}$ TNS exhibits negative first-harmonic magnetoresistance (MR$^{1ω}$) under a magnetic field ($B$) parallel to the direction of alternating current ($I^ω$), which may arise from the anomalous velocity induced by the Berry curvature of three-dimensional topological bands near the Fermi level. As $T_{CDW}$ drops, a positive-to-negative MR$^{1ω}$ transition is observed with decreasing perpendicular $B$, which is likely due to the contribution of Zeeman effect on current pathways in the disordered system. Moreover, interestingly, the second-harmonic nonlinear signals are suppressed, while the third-harmonic signals are significant and sensitive to both $B$ and $T_{CDW}$. Such observations, together with scaling analysis, suggest the quantum geometry quadrupole at play and the modulation of disorder on third-order nonlinearity. Our results pave an avenue for tailoring distinct-order magnetoresistive phases in disordered topological materials. |
| title | Disorder-mediated linear and nonlinear magnetotransport in the charge-density-wave material ${\rm Ta_2NiSe_7 }$ |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2512.08373 |