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Modeling and simulations of quantum phase slips in ultrathin superconducting wires
KTH, School of Engineering Sciences (SCI), Theoretical Physics.
KTH, School of Engineering Sciences (SCI), Theoretical Physics.ORCID iD: 0000-0002-9881-7857
2015 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 91, no 13, 134504Article in journal (Refereed) Published
Abstract [en]

We study quantum phase slips (QPS) in ultrathin superconducting wires. Starting from an effective one-dimensional microscopic model, which includes electromagnetic fluctuations, we map the problem to a (1+1)-dimensional gas of interacting instantons. We introduce a method to calculate the tunneling amplitude of quantum phase slips directly from Monte Carlo simulations. This allows us to go beyond the dilute instanton gas approximation and study the problem without any limitations of the density of QPS. We find that the tunneling amplitude shows a characteristic scaling behavior near the superconductor-insulator transition. We also calculate the voltage-charge relation of the insulating state, which is the dual of the Josephson current-phase relation in ordinary superconducting weak links. This evolves from a sinusoidal form in the regime of dilute QPS to more exotic shapes for higher QPS densities, where interactions are important.

Place, publisher, year, edition, pages
American Physical Society , 2015. Vol. 91, no 13, 134504
Keyword [en]
Quantum phase slips, superconductivity
National Category
Condensed Matter Physics
Research subject
Physics
Identifiers
URN: urn:nbn:se:kth:diva-165381DOI: 10.1103/PhysRevB.91.134504ISI: 000352588900005Scopus ID: 2-s2.0-84928780607OAI: oai:DiVA.org:kth-165381DiVA: diva2:808225
Note

QC 20150518

Available from: 2015-04-27 Created: 2015-04-27 Last updated: 2017-12-04Bibliographically approved

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Lidmar, Jack

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