Observation of non-Hermitian topology in a multi-terminal quantum Hall device
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arXiv
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| Autores principales: | , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2023
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| Materias: | |
| Acceso en línea: | |
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| _version_ | 1866929380524032000 |
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| author | Ochkan, Kyrylo Chaturvedi, Raghav Könye, Viktor Veyrat, Louis Giraud, Romain Mailly, Dominique Cavanna, Antonella Gennser, Ulf Hankiewicz, Ewelina M. Büchner, Bernd Brink, Jeroen van den Dufouleur, Joseph Fulga, Ion Cosma |
| author_facet | Ochkan, Kyrylo Chaturvedi, Raghav Könye, Viktor Veyrat, Louis Giraud, Romain Mailly, Dominique Cavanna, Antonella Gennser, Ulf Hankiewicz, Ewelina M. Büchner, Bernd Brink, Jeroen van den Dufouleur, Joseph Fulga, Ion Cosma |
| contents | Quantum devices characterized by non-Hermitian topology are predicted to show highly robust and potentially useful properties, but realizing them has remained a daunting experimental task. This is because non-Hermiticity is often associated with gain and loss, which would require precise tailoring to produce the signatures of nontrivial topology. Here, instead of gain/loss, we use the nonreciprocity of the quantum Hall edge states to directly observe non-Hermitian topology in a multi-terminal quantum Hall ring. Our transport measurements evidence a robust, non-Hermitian skin effect: currents and voltages show an exponential profile, which persists also across Hall plateau transitions away from the regime of maximum non-reciprocity. Our observation of non-Hermitian topology in a quantum device introduces a scalable experimental approach to construct and investigate generic non-Hermitian systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2305_18674 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Observation of non-Hermitian topology in a multi-terminal quantum Hall device Ochkan, Kyrylo Chaturvedi, Raghav Könye, Viktor Veyrat, Louis Giraud, Romain Mailly, Dominique Cavanna, Antonella Gennser, Ulf Hankiewicz, Ewelina M. Büchner, Bernd Brink, Jeroen van den Dufouleur, Joseph Fulga, Ion Cosma Mesoscale and Nanoscale Physics Quantum devices characterized by non-Hermitian topology are predicted to show highly robust and potentially useful properties, but realizing them has remained a daunting experimental task. This is because non-Hermiticity is often associated with gain and loss, which would require precise tailoring to produce the signatures of nontrivial topology. Here, instead of gain/loss, we use the nonreciprocity of the quantum Hall edge states to directly observe non-Hermitian topology in a multi-terminal quantum Hall ring. Our transport measurements evidence a robust, non-Hermitian skin effect: currents and voltages show an exponential profile, which persists also across Hall plateau transitions away from the regime of maximum non-reciprocity. Our observation of non-Hermitian topology in a quantum device introduces a scalable experimental approach to construct and investigate generic non-Hermitian systems. |
| title | Observation of non-Hermitian topology in a multi-terminal quantum Hall device |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2305.18674 |