Non-Hermitian topology in the quantum Hall effect of graphene
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866914978246688768 |
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| author | Özer, Burak Ochkan, Kyrylo Chaturvedi, Raghav Maltsev, Evgenii Könye, Viktor Giraud, Romain Veyrat, Arthur Hankiewicz, Ewelina M. Watanabe, Kenji Taniguchi, Takashi Büchner, Bernd Brink, Jeroen van den Fulga, Ion Cosma Dufouleur, Joseph Veyrat, Louis |
| author_facet | Özer, Burak Ochkan, Kyrylo Chaturvedi, Raghav Maltsev, Evgenii Könye, Viktor Giraud, Romain Veyrat, Arthur Hankiewicz, Ewelina M. Watanabe, Kenji Taniguchi, Takashi Büchner, Bernd Brink, Jeroen van den Fulga, Ion Cosma Dufouleur, Joseph Veyrat, Louis |
| contents | Quantum Hall phases have recently emerged as a platform to investigate non-Hermitian topology in condensed-matter systems. This platform is particularly interesting due to its tunability, which allows to modify the properties and topology of the investigated non-Hermitian phases by tuning external parameters of the system such as the magnetic field. Here, we show the tunability of non-Hermitian topology chirality in a graphene heterostructure using a gate voltage. By changing the charge carrier density, we unveil some novel properties specific to different quantum Hall regimes. First, we find that the best quantization of the non-Hermitian topological invariant is interestingly obtained at very high filling factor rather than on well-quantized quantum Hall plateaus. This is of particular importance for the efficient operation of devices based on non-Hermitian topology. Moreover, we observe an additional non-Hermitian topological phase in the insulating nu=0 quantum Hall plateau, which survives at lower fields than the opening of the nu=0 gap, confirming a recent prediction of a disorder-induced trivial phase. Our results evidence graphene as a promising platform for the study of non-Hermitian physics and of emergent phases in such topological devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_14329 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Non-Hermitian topology in the quantum Hall effect of graphene Özer, Burak Ochkan, Kyrylo Chaturvedi, Raghav Maltsev, Evgenii Könye, Viktor Giraud, Romain Veyrat, Arthur Hankiewicz, Ewelina M. Watanabe, Kenji Taniguchi, Takashi Büchner, Bernd Brink, Jeroen van den Fulga, Ion Cosma Dufouleur, Joseph Veyrat, Louis Mesoscale and Nanoscale Physics Quantum Hall phases have recently emerged as a platform to investigate non-Hermitian topology in condensed-matter systems. This platform is particularly interesting due to its tunability, which allows to modify the properties and topology of the investigated non-Hermitian phases by tuning external parameters of the system such as the magnetic field. Here, we show the tunability of non-Hermitian topology chirality in a graphene heterostructure using a gate voltage. By changing the charge carrier density, we unveil some novel properties specific to different quantum Hall regimes. First, we find that the best quantization of the non-Hermitian topological invariant is interestingly obtained at very high filling factor rather than on well-quantized quantum Hall plateaus. This is of particular importance for the efficient operation of devices based on non-Hermitian topology. Moreover, we observe an additional non-Hermitian topological phase in the insulating nu=0 quantum Hall plateau, which survives at lower fields than the opening of the nu=0 gap, confirming a recent prediction of a disorder-induced trivial phase. Our results evidence graphene as a promising platform for the study of non-Hermitian physics and of emergent phases in such topological devices. |
| title | Non-Hermitian topology in the quantum Hall effect of graphene |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2410.14329 |