Electrically driven Rabi dynamics of magnetic-field-induced corner states in a two-dimensional topological insulator
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arXiv
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2026
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| author | Khomitsky, D. V. Lavrukhina, E. A. Krasavin, D. P. Krishtopenko, S. S. Teppe, F. |
| author_facet | Khomitsky, D. V. Lavrukhina, E. A. Krasavin, D. P. Krishtopenko, S. S. Teppe, F. |
| contents | We study coherent electric manipulation of magnetic-field-induced localized states at a double kink of a helical edge in a HgTe/CdHgTe quantum well. An in-plane magnetic field opens a gap in the one-dimensional edge spectrum, while changes in the edge orientation generate localized in-gap states at the kinks. We show that, for suitable geometry and magnetic-field direction, two such states form an effective lithographically defined two-level subsystem. Using an edge-state model that includes both the localized levels and the continuum states outside the magnetic-field-induced gap, we calculate the electric-dipole matrix elements and solve the time-dependent problem under resonant driving. The resulting dynamics exhibits Rabi oscillations with linear frequencies of $20$--$40$~GHz for realistic parameters. We find that the continuum states provide a leakage channel whose strength is strongly controlled by the driving amplitude: reducing the electric field suppresses leakage below the percent level while preserving GHz-scale coherent oscillations. These results establish a route from magnetic-field-induced corner-state physics to electrically driven two-level dynamics in a realistic two-dimensional topological-insulator edge geometry. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_28499 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Electrically driven Rabi dynamics of magnetic-field-induced corner states in a two-dimensional topological insulator Khomitsky, D. V. Lavrukhina, E. A. Krasavin, D. P. Krishtopenko, S. S. Teppe, F. Mesoscale and Nanoscale Physics Materials Science We study coherent electric manipulation of magnetic-field-induced localized states at a double kink of a helical edge in a HgTe/CdHgTe quantum well. An in-plane magnetic field opens a gap in the one-dimensional edge spectrum, while changes in the edge orientation generate localized in-gap states at the kinks. We show that, for suitable geometry and magnetic-field direction, two such states form an effective lithographically defined two-level subsystem. Using an edge-state model that includes both the localized levels and the continuum states outside the magnetic-field-induced gap, we calculate the electric-dipole matrix elements and solve the time-dependent problem under resonant driving. The resulting dynamics exhibits Rabi oscillations with linear frequencies of $20$--$40$~GHz for realistic parameters. We find that the continuum states provide a leakage channel whose strength is strongly controlled by the driving amplitude: reducing the electric field suppresses leakage below the percent level while preserving GHz-scale coherent oscillations. These results establish a route from magnetic-field-induced corner-state physics to electrically driven two-level dynamics in a realistic two-dimensional topological-insulator edge geometry. |
| title | Electrically driven Rabi dynamics of magnetic-field-induced corner states in a two-dimensional topological insulator |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2605.28499 |