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18 April 2024 |
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Heat-mode excitation in a proximity superconductor | | A.O. Denisov
; A.V. Bubis
; S.U. Piatrusha
; N.A. Titova
; A.G. Nasibulin
; J. Becker
; J. Treu
; D. Ruhstorfer
; G. Koblmueller
; E.S. Tikhonov
; V.S.Khrapai
; | | Date: |
17 Jun 2020 | | Abstract: | Mesoscopic superconductivity deals with various 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
quasi-hole excitation branches. Other modes carrying heat or even spin, valley
etc. currents are much harder to control for their charge-neutral origin. 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
the first experiment of this kind and investigate the transport of heat in an
open hybrid device based on a superconductor proximitized InAs nanowire. Using
shot noise measurements we observe a novel effect of Andreev heat transmission
along the superconducting interface and fully characterize it in terms of the
thermal conductance on the order of $G_mathrm{th}sim e^2/h$, 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 neutral excitations in superconducting hybrids. | | Source: | arXiv, 2006.9803 | | Services: | Forum | Review | PDF | Favorites | |
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