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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2022
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2211.01780 |
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| _version_ | 1866916127075991552 |
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| author | Luckin, W. R. B. Li, Y. Jiang, J. Gunasekera, S. M. Wen, C. Zhang, Y. Prabhakaran, D. Flicker, F. Chen, Y. Mucha-Kruczynski, M. |
| author_facet | Luckin, W. R. B. Li, Y. Jiang, J. Gunasekera, S. M. Wen, C. Zhang, Y. Prabhakaran, D. Flicker, F. Chen, Y. Mucha-Kruczynski, M. |
| contents | We report on the interplay between a van Hove singularity and a charge density wave state in 2H-TaSe$_{2}$. We use angle-resolved photoemission spectroscopy to investigate changes in the Fermi surface of this material under surface doping with potassium. At high doping, we observe modifications which imply the disappearance of the $(3\times 3)$ charge density wave and formation of a different correlated state. Using a tight-binding-based approach as well as an effective model, we explain our observations as a consequence of coupling between the single-particle Lifshitz transition during which the Fermi level passes a van Hove singularity and the charge density order. In this scenario, the high electronic density of states associated with the van Hove singularity induces a change in the periodicity of the charge density wave from the known $(3\times 3)$ to a new $(2\times 2)$ superlattice. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2211_01780 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Controlling charge density order in 2H-TaSe$_{2}$ using a van Hove singularity Luckin, W. R. B. Li, Y. Jiang, J. Gunasekera, S. M. Wen, C. Zhang, Y. Prabhakaran, D. Flicker, F. Chen, Y. Mucha-Kruczynski, M. Strongly Correlated Electrons Materials Science We report on the interplay between a van Hove singularity and a charge density wave state in 2H-TaSe$_{2}$. We use angle-resolved photoemission spectroscopy to investigate changes in the Fermi surface of this material under surface doping with potassium. At high doping, we observe modifications which imply the disappearance of the $(3\times 3)$ charge density wave and formation of a different correlated state. Using a tight-binding-based approach as well as an effective model, we explain our observations as a consequence of coupling between the single-particle Lifshitz transition during which the Fermi level passes a van Hove singularity and the charge density order. In this scenario, the high electronic density of states associated with the van Hove singularity induces a change in the periodicity of the charge density wave from the known $(3\times 3)$ to a new $(2\times 2)$ superlattice. |
| title | Controlling charge density order in 2H-TaSe$_{2}$ using a van Hove singularity |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2211.01780 |