Negative Spin $Δ_T$ noise Induced by Spin-Flip Scattering and Andreev Reflection
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arXiv
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| Format: | Preprint |
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2023
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| _version_ | 1866913168789340160 |
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| author | Mishra, Sachiraj Benjamin, Colin |
| author_facet | Mishra, Sachiraj Benjamin, Colin |
| contents | We study charge $Δ_T$ noise, followed by an examination of spin $Δ_T$ noise, in the normal metal-spin flipper-normal metal-insulator-superconductor (N-sf-N-I-S) junction. Our analysis reveals a key contrast: while charge $Δ_T$ noise remains strictly positive, spin $Δ_T$ noise undergoes a sign reversal from positive to negative, driven by the interplay between spin-flip scattering as well as Andreev reflection. In contrast, charge quantum shot noise remains positive and sign-definite, which is also valid for spin quantum shot noise. The emergence of negative spin $Δ_T$ noise has two major implications. First, it establishes a clear distinction between spin-resolved $Δ_T$ noise and quantum shot noise: the former is dominated by opposite-spin correlations, whereas the latter is led by same-spin correlations. Second, it provides access to scattering mechanisms that are not captured by quantum shot noise alone. Thus, negative spin $Δ_T$ noise serves as a unique probe of the cooperative effects of Andreev reflection and spin flipping. We further place our results in context by comparing them with earlier reports of negative $Δ_T$ noise in strongly correlated systems, such as fractional quantum Hall states, and in multiterminal hybrid superconducting junctions. Overall, this work offers new insights into the mechanisms governing sign reversals in $Δ_T$ noise and highlights their role as distinctive fingerprints of spin-dependent scattering in superconducting hybrid devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2307_14072 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Negative Spin $Δ_T$ noise Induced by Spin-Flip Scattering and Andreev Reflection Mishra, Sachiraj Benjamin, Colin Mesoscale and Nanoscale Physics Signal Processing Applied Physics Quantum Physics We study charge $Δ_T$ noise, followed by an examination of spin $Δ_T$ noise, in the normal metal-spin flipper-normal metal-insulator-superconductor (N-sf-N-I-S) junction. Our analysis reveals a key contrast: while charge $Δ_T$ noise remains strictly positive, spin $Δ_T$ noise undergoes a sign reversal from positive to negative, driven by the interplay between spin-flip scattering as well as Andreev reflection. In contrast, charge quantum shot noise remains positive and sign-definite, which is also valid for spin quantum shot noise. The emergence of negative spin $Δ_T$ noise has two major implications. First, it establishes a clear distinction between spin-resolved $Δ_T$ noise and quantum shot noise: the former is dominated by opposite-spin correlations, whereas the latter is led by same-spin correlations. Second, it provides access to scattering mechanisms that are not captured by quantum shot noise alone. Thus, negative spin $Δ_T$ noise serves as a unique probe of the cooperative effects of Andreev reflection and spin flipping. We further place our results in context by comparing them with earlier reports of negative $Δ_T$ noise in strongly correlated systems, such as fractional quantum Hall states, and in multiterminal hybrid superconducting junctions. Overall, this work offers new insights into the mechanisms governing sign reversals in $Δ_T$ noise and highlights their role as distinctive fingerprints of spin-dependent scattering in superconducting hybrid devices. |
| title | Negative Spin $Δ_T$ noise Induced by Spin-Flip Scattering and Andreev Reflection |
| topic | Mesoscale and Nanoscale Physics Signal Processing Applied Physics Quantum Physics |
| url | https://arxiv.org/abs/2307.14072 |