Theory for Cd$_3$As$_2$ thin films in the presence of magnetic fields
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866929478934986752 |
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| author | Smith, M. Quito, V. L. Burkov, A. A. Orth, P. P. Martin, I. |
| author_facet | Smith, M. Quito, V. L. Burkov, A. A. Orth, P. P. Martin, I. |
| contents | We present a theory for thin films of the Dirac semimetal Cd$_3$As$_2$ in the presence of magnetic fields. We show that, above a critical thickness, specific subbands $n$ of thin film Cd$_3$As$_2$ are in a quantum spin Hall insulator regime and study their response to in- and out-of-plane magnetic fields. We find that sufficiently large in-plane Zeeman fields drive the system toward a 2D Dirac semimetal regime, provided the field is directed perpendicular to a high-symmetry mirror plane. For other directions, we find the Dirac points to be weakly gapped. We further investigate how the system responds to finite out-of-plane field components, both starting from the quantum spin Hall regime at small in-plane fields and from the 2D Dirac semimetal regimes at larger in-plane fields, addressing recent experimental observations in [A. C. Lygo et al., Phys. Rev. Lett. 130 046201 (2023)] and [B. Guo et al., Phys. Rev. Lett. 131, 046601(2023)]. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_07839 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Theory for Cd$_3$As$_2$ thin films in the presence of magnetic fields Smith, M. Quito, V. L. Burkov, A. A. Orth, P. P. Martin, I. Mesoscale and Nanoscale Physics We present a theory for thin films of the Dirac semimetal Cd$_3$As$_2$ in the presence of magnetic fields. We show that, above a critical thickness, specific subbands $n$ of thin film Cd$_3$As$_2$ are in a quantum spin Hall insulator regime and study their response to in- and out-of-plane magnetic fields. We find that sufficiently large in-plane Zeeman fields drive the system toward a 2D Dirac semimetal regime, provided the field is directed perpendicular to a high-symmetry mirror plane. For other directions, we find the Dirac points to be weakly gapped. We further investigate how the system responds to finite out-of-plane field components, both starting from the quantum spin Hall regime at small in-plane fields and from the 2D Dirac semimetal regimes at larger in-plane fields, addressing recent experimental observations in [A. C. Lygo et al., Phys. Rev. Lett. 130 046201 (2023)] and [B. Guo et al., Phys. Rev. Lett. 131, 046601(2023)]. |
| title | Theory for Cd$_3$As$_2$ thin films in the presence of magnetic fields |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2401.07839 |