Heat-Mode Excitation in a Proximity Superconductor
Artem Denisov,
Anton Bubis,
Stanislau Piatrusha,
Nadezhda Titova,
Albert Nasibulin,
Jonathan Becker,
Julian Treu,
Daniel Ruhstorfer,
Gregor Koblmüller,
Evgeny Tikhonov,
Vadim Khrapai
Affiliations
Artem Denisov
Osipyan Institute of Solid State Physics, Russian Academy of Sciences, 142432 Chernogolovka, Russia
Anton Bubis
Osipyan Institute of Solid State Physics, Russian Academy of Sciences, 142432 Chernogolovka, Russia
Stanislau Piatrusha
Osipyan Institute of Solid State Physics, Russian Academy of Sciences, 142432 Chernogolovka, Russia
Nadezhda Titova
Institute of Physics, Technology, and Informational Systems, Moscow Pedagogical State University, 29 Malaya Pirogovskaya St, 119435 Moscow, Russia
Albert Nasibulin
Skolkovo Institute of Science and Technology, Nobel Street 3, 121205 Moscow, Russia
Jonathan Becker
Center for Nanotechnology and Nanomaterials, Walter Schottky Institut and Physik Department, Technische Universität München, Am Coulombwall 4, 85748 Garching, Germany
Julian Treu
Center for Nanotechnology and Nanomaterials, Walter Schottky Institut and Physik Department, Technische Universität München, Am Coulombwall 4, 85748 Garching, Germany
Daniel Ruhstorfer
Center for Nanotechnology and Nanomaterials, Walter Schottky Institut and Physik Department, Technische Universität München, Am Coulombwall 4, 85748 Garching, Germany
Gregor Koblmüller
Center for Nanotechnology and Nanomaterials, Walter Schottky Institut and Physik Department, Technische Universität München, Am Coulombwall 4, 85748 Garching, Germany
Evgeny Tikhonov
Osipyan Institute of Solid State Physics, Russian Academy of Sciences, 142432 Chernogolovka, Russia
Vadim Khrapai
Osipyan Institute of Solid State Physics, Russian Academy of Sciences, 142432 Chernogolovka, Russia
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 Gth∼e2/h, 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.
