$Δ_T$ Noise from Electron-Hole Asymmetry in Normal and Superconducting Quantum Point Contacts
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arXiv
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| Natura: | Preprint |
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2026
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| _version_ | 1866912800221167616 |
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| author | Mishra, Sachiraj Benjamin, Colin |
| author_facet | Mishra, Sachiraj Benjamin, Colin |
| contents | This work examines $Δ_T$ noise in two-terminal hybrid nanostructures featuring a quantum point contact (QPC), realized either between two normal metals (NQN) or between a normal metal and a superconductor (NQS). The inclusion of a QPC breaks electron-hole (e-h) symmetry, leading to a finite thermovoltage. In contrast, earlier studies on hybrid junctions incorporating insulating barriers, as e-h symmetry is preserved, have vanishing thermovoltage, and consequently, $Δ_T$ noise is calculated at zero thermovoltage. In our setup, the broken e-h symmetry allows for a finite thermovoltage, at which we compute the corresponding $Δ_T$ noise. Unlike earlier studies restricted by e-h symmetry and vanishing thermovoltage, our work establishes a self-consistent framework in mesoscopic hybrid junctions, revealing how Andreev reflection fundamentally reshapes $Δ_T$ noise once e-h symmetry is broken. This broad access to charge fluctuation signatures provides a more comprehensive understanding of non-equilibrium transport in linear response. To our knowledge, this work provides the first self-consistent analysis of $Δ_T$ noise in superconducting hybrid junctions where e-h symmetry is broken, explicitly revealing how Andreev reflection modifies $Δ_T$ noise beyond the symmetry-protected zero-thermovoltage regime. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_00402 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | $Δ_T$ Noise from Electron-Hole Asymmetry in Normal and Superconducting Quantum Point Contacts Mishra, Sachiraj Benjamin, Colin Mesoscale and Nanoscale Physics Mathematical Physics Applied Physics Quantum Physics This work examines $Δ_T$ noise in two-terminal hybrid nanostructures featuring a quantum point contact (QPC), realized either between two normal metals (NQN) or between a normal metal and a superconductor (NQS). The inclusion of a QPC breaks electron-hole (e-h) symmetry, leading to a finite thermovoltage. In contrast, earlier studies on hybrid junctions incorporating insulating barriers, as e-h symmetry is preserved, have vanishing thermovoltage, and consequently, $Δ_T$ noise is calculated at zero thermovoltage. In our setup, the broken e-h symmetry allows for a finite thermovoltage, at which we compute the corresponding $Δ_T$ noise. Unlike earlier studies restricted by e-h symmetry and vanishing thermovoltage, our work establishes a self-consistent framework in mesoscopic hybrid junctions, revealing how Andreev reflection fundamentally reshapes $Δ_T$ noise once e-h symmetry is broken. This broad access to charge fluctuation signatures provides a more comprehensive understanding of non-equilibrium transport in linear response. To our knowledge, this work provides the first self-consistent analysis of $Δ_T$ noise in superconducting hybrid junctions where e-h symmetry is broken, explicitly revealing how Andreev reflection modifies $Δ_T$ noise beyond the symmetry-protected zero-thermovoltage regime. |
| title | $Δ_T$ Noise from Electron-Hole Asymmetry in Normal and Superconducting Quantum Point Contacts |
| topic | Mesoscale and Nanoscale Physics Mathematical Physics Applied Physics Quantum Physics |
| url | https://arxiv.org/abs/2601.00402 |