Pressure driven topological phase transition in chalcopyrite ZnGeSb$_2$
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arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2022
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| _version_ | 1866913285148770304 |
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| author | Sadhukhan, Surasree Sadhukhan, Banasree Kanungo, Sudipta |
| author_facet | Sadhukhan, Surasree Sadhukhan, Banasree Kanungo, Sudipta |
| contents | Recently topologically non-trivial phases have been identified in few time-reversal invariant systems that lack of inversion symmetry. Using density functional theory based first-principles calculations, we report a strong topologically non-trivial phase in chalchopyrite ZnGeSb$_2$, which can act as a model system of strained HgTe. The calculations reveal the non-zero topological invariant ($Z_2$), the presence of Dirac cone crossing in the surface spectral functions with spin-momentum locking. We also show that the application of moderate hydrostatic pressure ($\sim$7 GPa) induces topological phase transition from topological non-trivial phase to a topologically trivial phase. A discontinuity in the tetragonal distortion of non-centrosymmetric ZnGeSb$_2$ plays a crucial role in driving this topological phase transition. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2201_02347 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Pressure driven topological phase transition in chalcopyrite ZnGeSb$_2$ Sadhukhan, Surasree Sadhukhan, Banasree Kanungo, Sudipta Materials Science Recently topologically non-trivial phases have been identified in few time-reversal invariant systems that lack of inversion symmetry. Using density functional theory based first-principles calculations, we report a strong topologically non-trivial phase in chalchopyrite ZnGeSb$_2$, which can act as a model system of strained HgTe. The calculations reveal the non-zero topological invariant ($Z_2$), the presence of Dirac cone crossing in the surface spectral functions with spin-momentum locking. We also show that the application of moderate hydrostatic pressure ($\sim$7 GPa) induces topological phase transition from topological non-trivial phase to a topologically trivial phase. A discontinuity in the tetragonal distortion of non-centrosymmetric ZnGeSb$_2$ plays a crucial role in driving this topological phase transition. |
| title | Pressure driven topological phase transition in chalcopyrite ZnGeSb$_2$ |
| topic | Materials Science |
| url | https://arxiv.org/abs/2201.02347 |