%0 Book Section
%T Fluctuations in two-dimensional superconducting NbN nanobridges and nanostructures meanders
%A Kitaygorsky, Jennifer
%A Komissarov, I.
%A Jukna, A.
%A Minaeva, O.
%A Kaurova, N.
%A Divochiy, A.
%A Korneev, A.
%A Tarkhov, M.
%A Voronov, B.
%A Milostnaya, I.
%A Gol'tsman, G.
%A Sobolewski, R.
%B Proc. APS March Meeting
%D 2007
%V 52
%N 1
%F Kitaygorsky_etal2007
%O exported from refbase (https://db.rplab.ru/refbase/show.php?record=1027), last updated on Sun, 16 May 2021 16:40:15 -0500
%X We have observed fluctuations, manifested as sub-nanosecond to nanosecond transient, millivolt-amplitude voltage pulses, generated in two-dimensional NbN nanobridges, as well as in extended superconducting meander nanostructures, designed for single photon counting. Both nanobridges and nano-stripe meanders were biased at currents close to the critical current and measured in a range of temperatures from 1.5 to 8 K. During the tests, the devices were blocked from all incoming radiation by a metallic enclosure and shielded from any external magnetic fields. We attribute the observed spontaneous voltage pulses to the Kosterlitz-Thouless-type fluctuations, where the high enough applied bias current reduces the binding energy of vortex-antivortex pairs and, subsequently, thermal fluctuations break them apart causing the order parameter to momentarily reduce to zero, which in turn causes a transient voltage pulse. The duration of the voltage pulses depended on the device geometry (with the high-kinetic inductance meander structures having longer, nanosecond, pulses) while their rate was directly related to the biasing current as well as temperature.
%U https://meetings.aps.org/Meeting/MAR07/Event/59422
%P L9.00013