Effect of dephasing on the current through a periodically driven quantum point contact
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arXiv
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| Auteurs principaux: | , |
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| Format: | Preprint |
| Publié: |
2023
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| _version_ | 1866929522036703232 |
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| author | Ermakov, Igor Lychkovskiy, Oleg |
| author_facet | Ermakov, Igor Lychkovskiy, Oleg |
| contents | We consider two one-dimensional quantum $XX$ magnets linked by a periodically driven quantum point contact (QPC). If magnets are initially polarized in opposite directions, one expects that a spin current through the QPC will establish. It has been shown recently [Phys. Rev. B 103, L041405 (2021)] that, in fact, when the driving frequency exceeds a critical value, the current halts completely, the QPC being effectively insulating. Here we enquire how this picture is affected by quantum dephasing. Our findings reveal that any non-zero dephasing restores the current. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_13918 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Effect of dephasing on the current through a periodically driven quantum point contact Ermakov, Igor Lychkovskiy, Oleg Mesoscale and Nanoscale Physics Quantum Physics We consider two one-dimensional quantum $XX$ magnets linked by a periodically driven quantum point contact (QPC). If magnets are initially polarized in opposite directions, one expects that a spin current through the QPC will establish. It has been shown recently [Phys. Rev. B 103, L041405 (2021)] that, in fact, when the driving frequency exceeds a critical value, the current halts completely, the QPC being effectively insulating. Here we enquire how this picture is affected by quantum dephasing. Our findings reveal that any non-zero dephasing restores the current. |
| title | Effect of dephasing on the current through a periodically driven quantum point contact |
| topic | Mesoscale and Nanoscale Physics Quantum Physics |
| url | https://arxiv.org/abs/2311.13918 |