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Ginzburg-Landau theory for multiband superconductors : Microscopic derivation

Title data

Orlova, N. V. ; Shanenko, A. A. ; Milošević, M. V. ; Peeters, F. M. ; Vagov, Alexei ; Axt, Vollrath M.:
Ginzburg-Landau theory for multiband superconductors : Microscopic derivation.
In: Physical Review B. Vol. 87 (2013) Issue 13 . - Art.Nr. 134510, 8 S..
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.87.134510

Project information

Project financing: Supported by the “Odysseus” Program of the Flemish Government and the Flemish Science Foundation (FWO-Vl).

Abstract in another language

A procedure to derive the Ginzburg-Landau (GL) theory from the multiband BCS Hamiltonian is developed in a general case with an arbitrary number of bands and arbitrary interaction matrix. It combines the standard Gor'kov truncation and a subsequent reconstruction in order to match accuracies of the obtained terms. This reconstruction recovers the phenomenological GL theory as obtained from the Landau model of phase transitions but offers explicit microscopic expressions for the relevant parameters. Detailed calculations are presented for a three-band system treated as a prototype multiband superconductor. It is demonstrated that the symmetry in the coupling matrix may lead to the chiral ground state with the phase frustration, typical for systems with broken time-reversal symmetry.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: superconductivity; multiband superconductor; BCS; Landau Ginzburg theory; chiral ground state; broken time-reversal symmetry
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III > Chair Theoretical Physics III - Univ.-Prof. Dr. Martin Axt
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 02 Nov 2017 13:38
Last Modified: 02 Nov 2017 13:38
URI: https://eref.uni-bayreuth.de/id/eprint/40253