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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2605.22370 |
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| _version_ | 1866910245841797120 |
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| author | Kronseder, Matthias Mayer, Thomas Minár, Jan Marganska, Magdalena Werner, Hedwig Schmid, Florian Diaz-Pardo, Rebeca Vobornik, Ivana Fuji, Jun Streeck, Cornelia Gottwald, Alexander Kaser, Hendrik Kästner, Bernd Back, Christian H. |
| author_facet | Kronseder, Matthias Mayer, Thomas Minár, Jan Marganska, Magdalena Werner, Hedwig Schmid, Florian Diaz-Pardo, Rebeca Vobornik, Ivana Fuji, Jun Streeck, Cornelia Gottwald, Alexander Kaser, Hendrik Kästner, Bernd Back, Christian H. |
| contents | We report the generation of an anomalous linearly dispersing, spin-polarized band in Bi-based topological insulator (TI) thin films, induced by soft Ar-ion bombardment followed by annealing. This extra band -- which we call the anomalous linearly dispersing state (ALS) -- is superimposed on the regular band structure including the topological surface state (TSS), spans an unusually large energetic range of up to ${\sim}\,\SI{650}{\milli\electronvolt}$ at the $Γ$-point, and appears near the Fermi energy. Spin-resolved measurements indicate spin-momentum locking with a helicity \emph{opposite} to that of the regular TSS. The Fermi velocity of the ALS, $v_\mathrm{F} = (5.1\pm 0.4)\times 10^{5}\,\frac m s$, is indistinguishable from that of the regular TSS, $(5.3\pm 0.5)\times 10^{5}\,\frac m s$. The observation is reproducible across samples of varying thickness and was confirmed at two independent synchrotron radiation facilities. We discuss different mechanisms for the physical origin of the observed ALS including sputtering-induced TSS relocation, bi-layer formation by,e.g., chalcogen removal, and high-index surface relocation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_22370 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Generation of an anomalous linearly dispersing spin-polarized band in Bi-based topological insulators Kronseder, Matthias Mayer, Thomas Minár, Jan Marganska, Magdalena Werner, Hedwig Schmid, Florian Diaz-Pardo, Rebeca Vobornik, Ivana Fuji, Jun Streeck, Cornelia Gottwald, Alexander Kaser, Hendrik Kästner, Bernd Back, Christian H. Materials Science Mesoscale and Nanoscale Physics We report the generation of an anomalous linearly dispersing, spin-polarized band in Bi-based topological insulator (TI) thin films, induced by soft Ar-ion bombardment followed by annealing. This extra band -- which we call the anomalous linearly dispersing state (ALS) -- is superimposed on the regular band structure including the topological surface state (TSS), spans an unusually large energetic range of up to ${\sim}\,\SI{650}{\milli\electronvolt}$ at the $Γ$-point, and appears near the Fermi energy. Spin-resolved measurements indicate spin-momentum locking with a helicity \emph{opposite} to that of the regular TSS. The Fermi velocity of the ALS, $v_\mathrm{F} = (5.1\pm 0.4)\times 10^{5}\,\frac m s$, is indistinguishable from that of the regular TSS, $(5.3\pm 0.5)\times 10^{5}\,\frac m s$. The observation is reproducible across samples of varying thickness and was confirmed at two independent synchrotron radiation facilities. We discuss different mechanisms for the physical origin of the observed ALS including sputtering-induced TSS relocation, bi-layer formation by,e.g., chalcogen removal, and high-index surface relocation. |
| title | Generation of an anomalous linearly dispersing spin-polarized band in Bi-based topological insulators |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2605.22370 |