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Phase Slips In Tunable Width Point Contacts Created By Electromigration
Silhanek, Alejandro
2016Quantum Coherent Phenomena at Nanoscale
 

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Keywords :
quantum excitations; phase slips
Abstract :
[en] Superconducting nanowires have been, for years now, a topic of great interest due to their potential application in single photon detectors and as interconnects in circuits proposed for quantum computing. In this context, it is of fundamental importance to better understand the undesired and harmful appearance of thermal and quantum fluctuations of the superconducting order parameter as a function of the wire width. In this presentation, we explore in-situ controlled electromigration (EM) to fabricate nano-constrictions immersed in cryogenic environment. We demonstrate that a transition from thermally assisted phase slips (TAPS) to quantum phase slips (QPS) takes place when the effective cross section becomes smaller than ~150 nm^2. In the regime dominated by QPS the nanowire loses completely its capacity to carry current without dissipation, even at the lowest possible temperature. We also demonstrate that the bow-tie shaped constrictions exhibit a negative magnetoresistance at low magnetic fields which can be attributed to the suppression of superconductivity in the contact leads. Strikingly, the detrimental effect caused by the repeated EM can be healed by simply inverting the current direction. These findings reveal perspectives of the proposed fabrication method for exploring various fascinating superconducting phenomena in atomic size constrictions.
Disciplines :
Physics
Author, co-author :
Silhanek, Alejandro  ;  Université de Liège > Département de physique > Physique expérimentale des matériaux nanostructurés
Language :
English
Title :
Phase Slips In Tunable Width Point Contacts Created By Electromigration
Publication date :
05 September 2016
Event name :
Quantum Coherent Phenomena at Nanoscale
Event place :
Petrovac, Montenegro
Event date :
du 4 septembre 2016 au 9 septembre 2016
By request :
Yes
Audience :
International
Available on ORBi :
since 12 September 2016

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