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| Main Authors: | , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2511.23084 |
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| _version_ | 1866918454156591104 |
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| author | Nitzav, Yuval Dishi, Abigail Lohani, Himanshu Sidilkover, Ittai Ophir, Noam Gofman, Roni Anna Almoalem, Avior Mangel, Ilay Ragoler, Nitzan Bertran, Francois Sánchez-Barriga, Jaime Marchenko, Dmitry Varykhalov, Andrei Plumb, Nicholas Clark Feldman, Irena Soifer, Hadas Keselman, Anna Kanigel, Amit |
| author_facet | Nitzav, Yuval Dishi, Abigail Lohani, Himanshu Sidilkover, Ittai Ophir, Noam Gofman, Roni Anna Almoalem, Avior Mangel, Ilay Ragoler, Nitzan Bertran, Francois Sánchez-Barriga, Jaime Marchenko, Dmitry Varykhalov, Andrei Plumb, Nicholas Clark Feldman, Irena Soifer, Hadas Keselman, Anna Kanigel, Amit |
| contents | Trions, three-body bound states composed of an exciton and an additional charge, are typically fragile and require external excitation to form. Here, we report the spontaneous emergence of a stable trion gas at the surface of the layered semiconductor Ta2NiS5, revealed through angle-resolved photoemission spectroscopy. We observe a sharp, highly localized in-gap feature that cannot be explained by conventional band-theory. Instead, we argue that it arises from the formation of negative trions, stabilized by surface-induced band bending and the material's quasi-one-dimensional geometry. Unlike excitons, these trions form without optical pumping and persist at equilibrium, marking a rare example of an interaction-driven surface state in a nominally conventional semiconductor. Our findings establish Ta2NiS5 as a unique platform for exploring many-body physics at surfaces and open new avenues for studying and controlling collective excitations in low-dimensional systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_23084 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Trion gas on the surface of a failed excitonic insulator Nitzav, Yuval Dishi, Abigail Lohani, Himanshu Sidilkover, Ittai Ophir, Noam Gofman, Roni Anna Almoalem, Avior Mangel, Ilay Ragoler, Nitzan Bertran, Francois Sánchez-Barriga, Jaime Marchenko, Dmitry Varykhalov, Andrei Plumb, Nicholas Clark Feldman, Irena Soifer, Hadas Keselman, Anna Kanigel, Amit Strongly Correlated Electrons Materials Science Trions, three-body bound states composed of an exciton and an additional charge, are typically fragile and require external excitation to form. Here, we report the spontaneous emergence of a stable trion gas at the surface of the layered semiconductor Ta2NiS5, revealed through angle-resolved photoemission spectroscopy. We observe a sharp, highly localized in-gap feature that cannot be explained by conventional band-theory. Instead, we argue that it arises from the formation of negative trions, stabilized by surface-induced band bending and the material's quasi-one-dimensional geometry. Unlike excitons, these trions form without optical pumping and persist at equilibrium, marking a rare example of an interaction-driven surface state in a nominally conventional semiconductor. Our findings establish Ta2NiS5 as a unique platform for exploring many-body physics at surfaces and open new avenues for studying and controlling collective excitations in low-dimensional systems. |
| title | Trion gas on the surface of a failed excitonic insulator |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2511.23084 |