Experimental evidence of photoinduced vortex crossing in current carrying superconducting strips

Casaburi, A. , Heath, R.M. , Ejrnaes, M., Nappi, C., Cristiano, R. and Hadfield, R.H. (2015) Experimental evidence of photoinduced vortex crossing in current carrying superconducting strips. Physical Review B, 92(21), 214512. (doi:10.1103/PhysRevB.92.214512)

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Abstract

We report an experimental investigation that shows how magnetic vortices are generated and cross a current carrying superconducting strip when illuminated by a bright (∼MeV) and fast (<500 ps duration) infrared light pulse. The work has been carried out using a strike-and-probe electro-optic technique on a device consisting of a parallel superconducting strip configuration, with wide spacing between the strips to allow the interaction of the photons with a single strip. We find that photons hitting one strip induce a collective current redistribution in the parallel strips, which we can quantitatively account for in the framework of the London model by including the effect of generated and trapped magnetic vortices in the superconducting loops formed by the two adjacent slots. The amount of trapped vorticity and its dependence on increasing current density flowing in the illuminated strip is in good agreement with the photon-assisted unbinding of vortex-antivortex pairs. This work allows us to gain a deeper understanding of the interaction between photons and current carrying superconducting strips.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Hadfield, Professor Robert and Heath, Mr Robert and Casaburi, Dr Alessandro
Authors: Casaburi, A., Heath, R.M., Ejrnaes, M., Nappi, C., Cristiano, R., and Hadfield, R.H.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Physical Review B
Publisher:American Physical Society
ISSN:1098-0121
ISSN (Online):1550-235X

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
629121Semiconductor Integrated Quantum Optical CircuitsRobert HadfieldEngineering & Physical Sciences Research Council (EPSRC)EP/J007544/1ENG - ENGINEERING ELECTRONICS & NANO ENG
645961Integrated Photonic Quantum technologiesRobert HadfieldEngineering & Physical Sciences Research Council (EPSRC)EP/L024020/1ENG - ENGINEERING ELECTRONICS & NANO ENG