Heat-Mode Excitation in a Proximity Superconductor
Mesoscopic superconductivity deals with various quasiparticle excitation modes, only one of them—the charge-mode—being directly accessible for conductance measurements due to the imbalance in populations of quasi-electron and quasihole excitation branches. Other modes carrying heat or even spin, val...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-04-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/12/9/1461 |
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| author | Artem Denisov Anton Bubis Stanislau Piatrusha Nadezhda Titova Albert Nasibulin Jonathan Becker Julian Treu Daniel Ruhstorfer Gregor Koblmüller Evgeny Tikhonov Vadim Khrapai |
| author_facet | Artem Denisov Anton Bubis Stanislau Piatrusha Nadezhda Titova Albert Nasibulin Jonathan Becker Julian Treu Daniel Ruhstorfer Gregor Koblmüller Evgeny Tikhonov Vadim Khrapai |
| author_sort | Artem Denisov |
| collection | DOAJ |
| description | Mesoscopic superconductivity deals with various quasiparticle excitation modes, only one of them—the charge-mode—being directly accessible for conductance measurements due to the imbalance in populations of quasi-electron and quasihole excitation branches. Other modes carrying heat or even spin, valley etc. currents populate the branches equally and are charge-neutral, which makes them much harder to control. This noticeable gap in the experimental studies of mesoscopic non-equilibrium superconductivity can be filled by going beyond the conventional DC transport measurements and exploiting spontaneous current fluctuations. Here, we perform such an experiment and investigate the transport of heat in an open hybrid device based on a superconductor proximitized InAs nanowire. Using shot noise measurements, we investigate sub-gap Andreev heat guiding along the superconducting interface and fully characterize it in terms of the thermal conductance on the order of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>G</mi><mi>th</mi></msub><mo>∼</mo><msup><mi>e</mi><mn>2</mn></msup><mo>/</mo><mi>h</mi></mrow></semantics></math></inline-formula>, tunable by a back gate voltage. Understanding of the heat-mode also uncovers its implicit signatures in the non-local charge transport. Our experiments open a direct pathway to probe generic charge-neutral excitations in superconducting hybrids. |
| first_indexed | 2024-03-10T03:52:09Z |
| format | Article |
| id | doaj.art-e6fa32269d6b4328a26004672b3bdb93 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-10T03:52:09Z |
| publishDate | 2022-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-e6fa32269d6b4328a26004672b3bdb932023-11-23T08:54:33ZengMDPI AGNanomaterials2079-49912022-04-01129146110.3390/nano12091461Heat-Mode Excitation in a Proximity SuperconductorArtem Denisov0Anton Bubis1Stanislau Piatrusha2Nadezhda Titova3Albert Nasibulin4Jonathan Becker5Julian Treu6Daniel Ruhstorfer7Gregor Koblmüller8Evgeny Tikhonov9Vadim Khrapai10Osipyan Institute of Solid State Physics, Russian Academy of Sciences, 142432 Chernogolovka, RussiaOsipyan Institute of Solid State Physics, Russian Academy of Sciences, 142432 Chernogolovka, RussiaOsipyan Institute of Solid State Physics, Russian Academy of Sciences, 142432 Chernogolovka, RussiaInstitute of Physics, Technology, and Informational Systems, Moscow Pedagogical State University, 29 Malaya Pirogovskaya St, 119435 Moscow, RussiaSkolkovo Institute of Science and Technology, Nobel Street 3, 121205 Moscow, RussiaCenter for Nanotechnology and Nanomaterials, Walter Schottky Institut and Physik Department, Technische Universität München, Am Coulombwall 4, 85748 Garching, GermanyCenter for Nanotechnology and Nanomaterials, Walter Schottky Institut and Physik Department, Technische Universität München, Am Coulombwall 4, 85748 Garching, GermanyCenter for Nanotechnology and Nanomaterials, Walter Schottky Institut and Physik Department, Technische Universität München, Am Coulombwall 4, 85748 Garching, GermanyCenter for Nanotechnology and Nanomaterials, Walter Schottky Institut and Physik Department, Technische Universität München, Am Coulombwall 4, 85748 Garching, GermanyOsipyan Institute of Solid State Physics, Russian Academy of Sciences, 142432 Chernogolovka, RussiaOsipyan Institute of Solid State Physics, Russian Academy of Sciences, 142432 Chernogolovka, RussiaMesoscopic superconductivity deals with various quasiparticle excitation modes, only one of them—the charge-mode—being directly accessible for conductance measurements due to the imbalance in populations of quasi-electron and quasihole excitation branches. Other modes carrying heat or even spin, valley etc. currents populate the branches equally and are charge-neutral, which makes them much harder to control. This noticeable gap in the experimental studies of mesoscopic non-equilibrium superconductivity can be filled by going beyond the conventional DC transport measurements and exploiting spontaneous current fluctuations. Here, we perform such an experiment and investigate the transport of heat in an open hybrid device based on a superconductor proximitized InAs nanowire. Using shot noise measurements, we investigate sub-gap Andreev heat guiding along the superconducting interface and fully characterize it in terms of the thermal conductance on the order of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>G</mi><mi>th</mi></msub><mo>∼</mo><msup><mi>e</mi><mn>2</mn></msup><mo>/</mo><mi>h</mi></mrow></semantics></math></inline-formula>, tunable by a back gate voltage. Understanding of the heat-mode also uncovers its implicit signatures in the non-local charge transport. Our experiments open a direct pathway to probe generic charge-neutral excitations in superconducting hybrids.https://www.mdpi.com/2079-4991/12/9/1461Andreev reflectioncharge–heat separationshot noise |
| spellingShingle | Artem Denisov Anton Bubis Stanislau Piatrusha Nadezhda Titova Albert Nasibulin Jonathan Becker Julian Treu Daniel Ruhstorfer Gregor Koblmüller Evgeny Tikhonov Vadim Khrapai Heat-Mode Excitation in a Proximity Superconductor Nanomaterials Andreev reflection charge–heat separation shot noise |
| title | Heat-Mode Excitation in a Proximity Superconductor |
| title_full | Heat-Mode Excitation in a Proximity Superconductor |
| title_fullStr | Heat-Mode Excitation in a Proximity Superconductor |
| title_full_unstemmed | Heat-Mode Excitation in a Proximity Superconductor |
| title_short | Heat-Mode Excitation in a Proximity Superconductor |
| title_sort | heat mode excitation in a proximity superconductor |
| topic | Andreev reflection charge–heat separation shot noise |
| url | https://www.mdpi.com/2079-4991/12/9/1461 |
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