Evolution of the Saddle Point in Antimony Telluride Homologous Superlattices
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866915950792540160 |
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| author | Shen, Yi-Hsin Smolenski, Shane Wen, Ming Hou, Yimo Downey, Eoghan Hammond-Renfro, Jakob Moncrieffe, Katharine Lin, Chun Hashimoto, Makoto Lu, Donghui Sun, Kai Zgid, Dominika Gull, Emanuel Poudeu, Pierre Ferdinand P. Jo, Na Hyun Goldman, Rachel S. |
| author_facet | Shen, Yi-Hsin Smolenski, Shane Wen, Ming Hou, Yimo Downey, Eoghan Hammond-Renfro, Jakob Moncrieffe, Katharine Lin, Chun Hashimoto, Makoto Lu, Donghui Sun, Kai Zgid, Dominika Gull, Emanuel Poudeu, Pierre Ferdinand P. Jo, Na Hyun Goldman, Rachel S. |
| contents | Combining topological insulators with topological semimetals in the form of homologous superlattices is a promising approach for generating correlated quantum matter based upon Fermi level alignment with band extrema. For antimony telluride, a saddle point is predicted to occur at the M-point, while antimonene layering is predicted to move the M-point valence band towards the Fermi level. To date, the predicted saddle point at the M-point has not yet been demonstrated, and studies of antimony telluride homologous superlattices have been limited to one or two layers of antimonene added to antimony telluride. Here, we present scanning tunneling spectroscopy and angle-resolved photoemission spectroscopy studies of a series of antimony telluride homologous superlattices with two to four layers of antimonene. In addition to demonstrating the presence of a saddle point and associated van Hove singularity near the M-point, we identify the key role of Sb and Te $p_z$ orbital hybridization in driving the van Hove singularity toward the Fermi level. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_21037 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Evolution of the Saddle Point in Antimony Telluride Homologous Superlattices Shen, Yi-Hsin Smolenski, Shane Wen, Ming Hou, Yimo Downey, Eoghan Hammond-Renfro, Jakob Moncrieffe, Katharine Lin, Chun Hashimoto, Makoto Lu, Donghui Sun, Kai Zgid, Dominika Gull, Emanuel Poudeu, Pierre Ferdinand P. Jo, Na Hyun Goldman, Rachel S. Materials Science Combining topological insulators with topological semimetals in the form of homologous superlattices is a promising approach for generating correlated quantum matter based upon Fermi level alignment with band extrema. For antimony telluride, a saddle point is predicted to occur at the M-point, while antimonene layering is predicted to move the M-point valence band towards the Fermi level. To date, the predicted saddle point at the M-point has not yet been demonstrated, and studies of antimony telluride homologous superlattices have been limited to one or two layers of antimonene added to antimony telluride. Here, we present scanning tunneling spectroscopy and angle-resolved photoemission spectroscopy studies of a series of antimony telluride homologous superlattices with two to four layers of antimonene. In addition to demonstrating the presence of a saddle point and associated van Hove singularity near the M-point, we identify the key role of Sb and Te $p_z$ orbital hybridization in driving the van Hove singularity toward the Fermi level. |
| title | Evolution of the Saddle Point in Antimony Telluride Homologous Superlattices |
| topic | Materials Science |
| url | https://arxiv.org/abs/2604.21037 |