New three-dimensional dispersion in the type-II Dirac semimetals PtTe$_2$ and PdTe$_2$ revealed through Angle Resolved Photoemission Spectroscopy
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| Autores principales: | , , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2023
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| author | Pelayo, Ivan Bergner, Derek Williams, Archibald J. Qi, Jiayuwen Zhu, Penghao Nabi, Mahfuzun Huey, Warren L. B. Moreschini, Luca Deng, Ziling Denlinger, Jonathan Lanzara, Alessandra Lu, Yuan-Ming Windl, Wolfgang Goldberger, Joshua Ojeda-Aristizabal, Claudia |
| author_facet | Pelayo, Ivan Bergner, Derek Williams, Archibald J. Qi, Jiayuwen Zhu, Penghao Nabi, Mahfuzun Huey, Warren L. B. Moreschini, Luca Deng, Ziling Denlinger, Jonathan Lanzara, Alessandra Lu, Yuan-Ming Windl, Wolfgang Goldberger, Joshua Ojeda-Aristizabal, Claudia |
| contents | PtTe$_2$ and PdTe$_2$ are among the first transition metal dichalcogenides that were predicted to host type-II Dirac fermions, exotic particles prohibited in free space. These materials are layered and air-stable, which makes them top candidates for technological applications that take advantage of their anisotropic magnetotransport properties. Here, we provide a detailed characterization of the electronic structure of PtTe$_2$ and PdTe$_2$ using Angle Resolved Photoemission Spectroscopy (ARPES) and Density Functional Theory (DFT) calculations, unveiling a new three-dimensional dispersion in these materials. Through the use of circularly polarized light, we report a different behavior of such dispersion in PdTe$_2$ compared to PtTe$_2$, that we relate to a symmetry analysis of the dipole matrix element. Such analysis reveals a link between the observed circular dichroism and the different momentum-dependent terms in the dispersion of these two compounds, despite their close similarity in crystal structure. Additionally, our data shows a clear difference in the circular dichroic signal for the type-II Dirac cones characteristic of these materials, compared to their topologically protected surface states. Our work provides a useful reference for the ARPES characterization of other transition metal dichalcogenides with topological properties and illustrates the use of circular dichroism as a guide to identify the topological character of two otherwise equivalent band dispersions, and to recognize different attributes in the band structure of similar materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_15371 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | New three-dimensional dispersion in the type-II Dirac semimetals PtTe$_2$ and PdTe$_2$ revealed through Angle Resolved Photoemission Spectroscopy Pelayo, Ivan Bergner, Derek Williams, Archibald J. Qi, Jiayuwen Zhu, Penghao Nabi, Mahfuzun Huey, Warren L. B. Moreschini, Luca Deng, Ziling Denlinger, Jonathan Lanzara, Alessandra Lu, Yuan-Ming Windl, Wolfgang Goldberger, Joshua Ojeda-Aristizabal, Claudia Mesoscale and Nanoscale Physics PtTe$_2$ and PdTe$_2$ are among the first transition metal dichalcogenides that were predicted to host type-II Dirac fermions, exotic particles prohibited in free space. These materials are layered and air-stable, which makes them top candidates for technological applications that take advantage of their anisotropic magnetotransport properties. Here, we provide a detailed characterization of the electronic structure of PtTe$_2$ and PdTe$_2$ using Angle Resolved Photoemission Spectroscopy (ARPES) and Density Functional Theory (DFT) calculations, unveiling a new three-dimensional dispersion in these materials. Through the use of circularly polarized light, we report a different behavior of such dispersion in PdTe$_2$ compared to PtTe$_2$, that we relate to a symmetry analysis of the dipole matrix element. Such analysis reveals a link between the observed circular dichroism and the different momentum-dependent terms in the dispersion of these two compounds, despite their close similarity in crystal structure. Additionally, our data shows a clear difference in the circular dichroic signal for the type-II Dirac cones characteristic of these materials, compared to their topologically protected surface states. Our work provides a useful reference for the ARPES characterization of other transition metal dichalcogenides with topological properties and illustrates the use of circular dichroism as a guide to identify the topological character of two otherwise equivalent band dispersions, and to recognize different attributes in the band structure of similar materials. |
| title | New three-dimensional dispersion in the type-II Dirac semimetals PtTe$_2$ and PdTe$_2$ revealed through Angle Resolved Photoemission Spectroscopy |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2312.15371 |