Ultrafast Non-Hermitian Skin Effect
Fuente:
arXiv
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| Autori principali: | , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866912362786717696 |
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| author | Schneider, Barbara Dikopoltsev, Alexander Bestler, Markus Täschler, Philipp Beck, Mattias Burghoff, David Zilberberg, Oded Faist, Jérome |
| author_facet | Schneider, Barbara Dikopoltsev, Alexander Bestler, Markus Täschler, Philipp Beck, Mattias Burghoff, David Zilberberg, Oded Faist, Jérome |
| contents | Topological phases of matter commonly feature protected states at their boundaries. Transferring this protection to time-metamaterials is extremely challenging, as it requires the generation of an abrupt interface between two topologically distinct bulks. Here, we realize and measure an ultrafast topological non-Hermitian skin mode bound to an interface circulating within the cavity of a fast-gain semiconductor laser. The nonlinear stationary state generated in such devices features a jump in the instantaneous frequency. We show that this discontinuity gives rise to a topological interface for the field fluctuations in the system. Using direct intensity sampling, we experimentally measure the skin modes and their positioning at the frequency jump of the stationary state. Analysis of these isolated modes reveals an ultrashort full-width at half-maximum of 583 $\pm$ 16 fs. Furthermore, we show that we can tune the shape and relative timing shift of the skin modes via external bias modulation. Finally, both numerical and experimental analysis of the noise in the system reveal that field fluctuations are funneled into the topological interface. Our findings reveal a new way to generate topologically protected states of light in time, which paves the way for novel time-varying physics as well as metrological applications. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_03658 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Ultrafast Non-Hermitian Skin Effect Schneider, Barbara Dikopoltsev, Alexander Bestler, Markus Täschler, Philipp Beck, Mattias Burghoff, David Zilberberg, Oded Faist, Jérome Optics Mesoscale and Nanoscale Physics Topological phases of matter commonly feature protected states at their boundaries. Transferring this protection to time-metamaterials is extremely challenging, as it requires the generation of an abrupt interface between two topologically distinct bulks. Here, we realize and measure an ultrafast topological non-Hermitian skin mode bound to an interface circulating within the cavity of a fast-gain semiconductor laser. The nonlinear stationary state generated in such devices features a jump in the instantaneous frequency. We show that this discontinuity gives rise to a topological interface for the field fluctuations in the system. Using direct intensity sampling, we experimentally measure the skin modes and their positioning at the frequency jump of the stationary state. Analysis of these isolated modes reveals an ultrashort full-width at half-maximum of 583 $\pm$ 16 fs. Furthermore, we show that we can tune the shape and relative timing shift of the skin modes via external bias modulation. Finally, both numerical and experimental analysis of the noise in the system reveal that field fluctuations are funneled into the topological interface. Our findings reveal a new way to generate topologically protected states of light in time, which paves the way for novel time-varying physics as well as metrological applications. |
| title | Ultrafast Non-Hermitian Skin Effect |
| topic | Optics Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2505.03658 |