Monday, July 1, 2013

1306.6797 (Marc Peter Westig et al.)

Improved Nb SIS devices for heterodyne mixers between 700 GHz and 1.3
THz with NbTiN striplines using a normal metal energy relaxation layer

Marc Peter Westig, Stefan Selig, Karl Jacobs, Teun M. Klapwijk, Netty Honingh
In this paper we demonstrate experimentally the implementation of a niobium-trilayer junction with an aluminum-oxide tunnel barrier, embedded in a high-gap superconducting niobium-titanium-nitride circuit. Previously reported heating by quasiparticle trapping is removed by inserting a normal metal layer of gold between the niobium junction and the niobium-titanium-nitride layer. We analyze in dc-characterization measurements the cooling of the nonequilibrium quasiparticles in various device geometries having different gold layer thickness and shape. Our work is concluded with remarks for future heterodyne mixer experiments using our device technology.
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