Reversal of quantised Hall drifts at non-interacting and interacting topological boundaries
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arXiv
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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2023
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| _version_ | 1866916235823808512 |
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| author | Zhu, Zijie Gächter, Marius Walter, Anne-Sophie Viebahn, Konrad Esslinger, Tilman |
| author_facet | Zhu, Zijie Gächter, Marius Walter, Anne-Sophie Viebahn, Konrad Esslinger, Tilman |
| contents | The transport properties of gapless edge modes at boundaries between topologically distinct domains are of fundamental and technological importance. Therefore, it is crucial to gain a better understanding of topological edge states and their response to interparticle interactions. Here, we experimentally study long-distance quantised Hall drifts in a harmonically confined topological pump of non-interacting and interacting ultracold fermionic atoms. We find that quantised drifts halt and reverse their direction when the atoms reach a critical slope of the confining potential, revealing the presence of a topological boundary. The drift reversal corresponds to a band transfer between a band with Chern number $C = +1$ and a band with $C = -1$ via a gapless edge mode, in agreement with the bulk-edge correspondence for non-interacting particles. We establish that a non-zero repulsive Hubbard interaction leads to the emergence of an additional edge in the system, relying on a purely interaction-induced mechanism, in which pairs of fermions are split. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2301_03583 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Reversal of quantised Hall drifts at non-interacting and interacting topological boundaries Zhu, Zijie Gächter, Marius Walter, Anne-Sophie Viebahn, Konrad Esslinger, Tilman Quantum Gases Mesoscale and Nanoscale Physics Strongly Correlated Electrons Atomic Physics The transport properties of gapless edge modes at boundaries between topologically distinct domains are of fundamental and technological importance. Therefore, it is crucial to gain a better understanding of topological edge states and their response to interparticle interactions. Here, we experimentally study long-distance quantised Hall drifts in a harmonically confined topological pump of non-interacting and interacting ultracold fermionic atoms. We find that quantised drifts halt and reverse their direction when the atoms reach a critical slope of the confining potential, revealing the presence of a topological boundary. The drift reversal corresponds to a band transfer between a band with Chern number $C = +1$ and a band with $C = -1$ via a gapless edge mode, in agreement with the bulk-edge correspondence for non-interacting particles. We establish that a non-zero repulsive Hubbard interaction leads to the emergence of an additional edge in the system, relying on a purely interaction-induced mechanism, in which pairs of fermions are split. |
| title | Reversal of quantised Hall drifts at non-interacting and interacting topological boundaries |
| topic | Quantum Gases Mesoscale and Nanoscale Physics Strongly Correlated Electrons Atomic Physics |
| url | https://arxiv.org/abs/2301.03583 |