Vortex states in nanoscale superconducting squares

The influence of quantum confinement

L. F. Zhang, L. Covaci, M. V. Milošević, Golibjon Berdiyorov, F. M. Peeters

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Bogoliubov-de Gennes theory is used to investigate the effect of the size of a superconducting square on the vortex states in the quantum confinement regime. When the superconducting coherence length is comparable to the Fermi wavelength, the shape resonances of the superconducting order parameter have strong influence on the vortex configuration. Several unconventional vortex states, including asymmetric ones, giant-multivortex combinations, and states comprising giant antivortices, were found as ground states and their stability was found to be very sensitive on the value of kFξ0, the size of the sample W, and the magnetic flux Φ. By increasing the temperature and/or enlarging the size of the sample, quantum confinement is suppressed and the conventional mesoscopic vortex states as predicted by the Ginzburg-Laudau (GL) theory are recovered. However, contrary to the GL results we found that the states containing symmetry-induced vortex-antivortex pairs are stable over the whole temperature range. It turns out that the inhomogeneous order parameter induced by quantum confinement favors vortex-antivortex molecules, as well as giant vortices with a rich structure in the vortex core - unattainable in the GL domain.

Original languageEnglish
Article number144501
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume88
Issue number14
DOIs
Publication statusPublished - 7 Oct 2013
Externally publishedYes

Fingerprint

Quantum confinement
Vortex flow
vortices
Magnetic flux
Ground state
magnetic flux
Wavelength
Temperature
Molecules
expansion
ground state
temperature
symmetry
configurations
wavelengths

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Vortex states in nanoscale superconducting squares : The influence of quantum confinement. / Zhang, L. F.; Covaci, L.; Milošević, M. V.; Berdiyorov, Golibjon; Peeters, F. M.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 88, No. 14, 144501, 07.10.2013.

Research output: Contribution to journalArticle

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