Kramers nodal line in the charge density wave state of YTe$_3$ and the influence of twin domains
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| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| author | Sarkar, Shuvam Bhattacharya, Joydipto Bhakuni, Pramod Sadhukhan, Pampa Batabyal, Rajib Malliakas, Christos D. Bianchi, Marco Curcio, Davide Roy, Shubhankar Pariari, Arnab Sathe, Vasant G. Mandal, Prabhat Kanatzidis, Mercouri G. Hofmann, Philip Chakrabarti, Aparna Barman, Sudipta Roy |
| author_facet | Sarkar, Shuvam Bhattacharya, Joydipto Bhakuni, Pramod Sadhukhan, Pampa Batabyal, Rajib Malliakas, Christos D. Bianchi, Marco Curcio, Davide Roy, Shubhankar Pariari, Arnab Sathe, Vasant G. Mandal, Prabhat Kanatzidis, Mercouri G. Hofmann, Philip Chakrabarti, Aparna Barman, Sudipta Roy |
| contents | Recent studies have focused on the relationship between charge density wave (CDW) collective electronic ground states and nontrivial topological states. Using angle-resolved photoemission and density functional theory, we establish that YTe$_3$ is a CDW-induced Kramers nodal line (KNL) metal, a newly proposed topological state of matter. YTe$_3$ is a non-magnetic quasi-2D chalcogenide with a CDW wave vector ($q_{\rm cdw}$) of 0.2907c$^*$. Scanning tunneling microscopy and low energy electron diffraction revealed two orthogonal CDW domains, each with a unidirectional CDW and similar YTe$_3$. The effective band structure (EBS) computations, using DFT-calculated folded bands, show excellent agreement with ARPES because a realistic x-ray crystal structure and twin domains are considered in the calculations. The Fermi surface and ARPES intensity plots show weak shadow bands displaced by $q_{\rm cdw}$ from the main bands. These are linked to CDW modulation, as the EBS calculation confirms. Bilayer split main and shadow bands suggest the existence of crossings, according to theory and experiment. DFT bands, including spin-orbit coupling, indicate a nodal line along the $Σ$ line from multiple band crossings perpendicular to the KNL. Additionally, doubly degenerate bands are only found along the KNL at all energies, with some bands dispersing through the Fermi level. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_10222 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Kramers nodal line in the charge density wave state of YTe$_3$ and the influence of twin domains Sarkar, Shuvam Bhattacharya, Joydipto Bhakuni, Pramod Sadhukhan, Pampa Batabyal, Rajib Malliakas, Christos D. Bianchi, Marco Curcio, Davide Roy, Shubhankar Pariari, Arnab Sathe, Vasant G. Mandal, Prabhat Kanatzidis, Mercouri G. Hofmann, Philip Chakrabarti, Aparna Barman, Sudipta Roy Materials Science Recent studies have focused on the relationship between charge density wave (CDW) collective electronic ground states and nontrivial topological states. Using angle-resolved photoemission and density functional theory, we establish that YTe$_3$ is a CDW-induced Kramers nodal line (KNL) metal, a newly proposed topological state of matter. YTe$_3$ is a non-magnetic quasi-2D chalcogenide with a CDW wave vector ($q_{\rm cdw}$) of 0.2907c$^*$. Scanning tunneling microscopy and low energy electron diffraction revealed two orthogonal CDW domains, each with a unidirectional CDW and similar YTe$_3$. The effective band structure (EBS) computations, using DFT-calculated folded bands, show excellent agreement with ARPES because a realistic x-ray crystal structure and twin domains are considered in the calculations. The Fermi surface and ARPES intensity plots show weak shadow bands displaced by $q_{\rm cdw}$ from the main bands. These are linked to CDW modulation, as the EBS calculation confirms. Bilayer split main and shadow bands suggest the existence of crossings, according to theory and experiment. DFT bands, including spin-orbit coupling, indicate a nodal line along the $Σ$ line from multiple band crossings perpendicular to the KNL. Additionally, doubly degenerate bands are only found along the KNL at all energies, with some bands dispersing through the Fermi level. |
| title | Kramers nodal line in the charge density wave state of YTe$_3$ and the influence of twin domains |
| topic | Materials Science |
| url | https://arxiv.org/abs/2405.10222 |