Speaker | Claudio Guarcello |
Affiliation | NEST CNR Nano, Pisa, Italy |
Date | 2019-03-01 |
Time | 11:00 |
Venue | Sala seminari NEST |
Host | Alessandro Braggio |
We discuss the peculiar behavior of the critical current Ic, that is the maximum supercurrent that can flow in the device, of a temperature-biased Josephson tunnel junction formed by different superconductors[1]. Our theoretical exploration ofcoherent thermal transport in such a junction reveals the abrupt variation of Ic as the electrodes forming the device reside at specific temperatures. In particular, we thoroughly discuss a counterintuitively non-linear behavior of the critical current, since it increases by enhancing the temperature of one lead, instead of monotonically reducing as naively expected. This phenomenon paves the way to the use of an asymmetric Josephson junction as a temperature-based threshold single-photon detector operating in the non-dissipative branch.[2] This device is conceived to work at temperatures slightly lower than those giving a critical current sudden jump, so that an incident photon can be easily revealed since it produces a temperature increase that can induce a clearly measurable critical current variation.
Alessandro Braggio - <a href="mailto:alessandro.braggio@nano.cnr.it
Istituto Nanoscienze
Consiglio Nazionale delle Ricerche
PEC: protocollo.nano@pec.cnr.it
Partita IVA 02118311006
Piazza San Silvestro 12
56127 Pisa, Italy
phone +39 050 509418
fax +39 050 509550
Istituto Nanoscienze Consiglio Nazionale delle Ricerche
Piazza San Silvestro 12, I
56127 Pisa
phone +39 050 509525/418
fax +39 050 509550
via Campi 213/A, I
41125 Modena 7
phone +39 059 2055629
fax +39 059 2055651″
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