Negative magnetoresistance in strained $α$-Sn and $α$-SnGe films in an in-plane magnetic field
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866910176164970496 |
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| author | Phan, Sunny Kogan, Andrei Thompson, Jesse Johnson, Trent Khaetskii, Alexander Kiefer, Arnold |
| author_facet | Phan, Sunny Kogan, Andrei Thompson, Jesse Johnson, Trent Khaetskii, Alexander Kiefer, Arnold |
| contents | To test the hypothesis that the chiral anomaly is responsible for negative magnetoresitance (MR) in \atn{}, we have studied magnetotransport in strained, epitaxial films of pure \aSn{} and the alloy \aSnGe{} that are in the Dirac semimetal and 3D topological insulator state, respectively. We have observed for both states a negative MR with current either parallel or transverse to the in-plane magnetic field, but with a different dependence of MR on $\vec{B}$ strength. Our results are inconsistent with the chiral anomaly and suggest that other mechanisms may be responsible for negative MR in the Dirac/Weyl semimetal phase of \aSn{}. We also discuss several factors in sample design and material quality that may be contributing to the incongruous observations of MR reported in studies of strained \atn{} films. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_26168 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Negative magnetoresistance in strained $α$-Sn and $α$-SnGe films in an in-plane magnetic field Phan, Sunny Kogan, Andrei Thompson, Jesse Johnson, Trent Khaetskii, Alexander Kiefer, Arnold Materials Science To test the hypothesis that the chiral anomaly is responsible for negative magnetoresitance (MR) in \atn{}, we have studied magnetotransport in strained, epitaxial films of pure \aSn{} and the alloy \aSnGe{} that are in the Dirac semimetal and 3D topological insulator state, respectively. We have observed for both states a negative MR with current either parallel or transverse to the in-plane magnetic field, but with a different dependence of MR on $\vec{B}$ strength. Our results are inconsistent with the chiral anomaly and suggest that other mechanisms may be responsible for negative MR in the Dirac/Weyl semimetal phase of \aSn{}. We also discuss several factors in sample design and material quality that may be contributing to the incongruous observations of MR reported in studies of strained \atn{} films. |
| title | Negative magnetoresistance in strained $α$-Sn and $α$-SnGe films in an in-plane magnetic field |
| topic | Materials Science |
| url | https://arxiv.org/abs/2604.26168 |