Breakdown of bosonic Thouless pump due to interaction in a quasiperiodic lattice
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arXiv
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| Autores principales: | , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| _version_ | 1866908788758413312 |
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| author | Mondal, Suman Gottlob, Emmanuel Heidrich-Meisner, Fabian Schneider, Ulrich |
| author_facet | Mondal, Suman Gottlob, Emmanuel Heidrich-Meisner, Fabian Schneider, Ulrich |
| contents | We investigate the effect of inter-particle interaction on the quantized Thouless pump in the bosonic quasiperiodic Aubry-Andr{é} model and find that the quantization of the pumped charge breaks down already for weak interactions. Furthermore, the pumped charge undergoes sharp changes as a function of interaction strength that we can attribute to the closing of specific doublon channels. As expected, the quantization revives in the hard-core limit at very large interaction strengths where the bosons are subject to a hardcore constraint. Interestingly, the stability of isolated doublons under the pump depends on the band they are in. For repulsive interactions and a suitably fixed pump period, doublons in the lowest band are pumped stably while doublons in higher bands dissociate during the pump with one particle decaying into a lower band. This asymmetry leads to the decay of the total energy over time, in stark contrast to the typical Floquet heating expected for a driven many-body system. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_18229 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Breakdown of bosonic Thouless pump due to interaction in a quasiperiodic lattice Mondal, Suman Gottlob, Emmanuel Heidrich-Meisner, Fabian Schneider, Ulrich Quantum Gases Disordered Systems and Neural Networks Other Condensed Matter We investigate the effect of inter-particle interaction on the quantized Thouless pump in the bosonic quasiperiodic Aubry-Andr{é} model and find that the quantization of the pumped charge breaks down already for weak interactions. Furthermore, the pumped charge undergoes sharp changes as a function of interaction strength that we can attribute to the closing of specific doublon channels. As expected, the quantization revives in the hard-core limit at very large interaction strengths where the bosons are subject to a hardcore constraint. Interestingly, the stability of isolated doublons under the pump depends on the band they are in. For repulsive interactions and a suitably fixed pump period, doublons in the lowest band are pumped stably while doublons in higher bands dissociate during the pump with one particle decaying into a lower band. This asymmetry leads to the decay of the total energy over time, in stark contrast to the typical Floquet heating expected for a driven many-body system. |
| title | Breakdown of bosonic Thouless pump due to interaction in a quasiperiodic lattice |
| topic | Quantum Gases Disordered Systems and Neural Networks Other Condensed Matter |
| url | https://arxiv.org/abs/2601.18229 |