Dresden 2017 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 39: Superconductivity: (General) Theory
TT 39.5: Vortrag
Mittwoch, 22. März 2017, 10:30–10:45, HSZ 103
Three-band superconductors with broken time reversal symmetry ground states — •Yuriy Yerin1,2, Alexander Omelyanchouk2, Stefan-Ludwig Drechsler3, Jeroen van den Brink3, and Dmitri Efremov3 — 1Institute for Physics of Microstructures, Russia — 2Institute for Low-Temperature Physics , Ukraine — 3Institute for Theoretical Solid State Physics, Leibnitz Institute IFW-Dresden, Germany
Within the Ginzburg-Landau formalism we provide a classification of all possible ground states of a three-band superconductor (SC) where either states with broken time-reversal symmetry (BTRS) or a single non-BTRS ground state of s-wave symmetry are realized. We track possible evolutions of the BTRS ground state in an external magnetic field. We show that an external magnetic field may trigger transitions between BTRS and non-BTRS states. We propose to use the current induced magnetic flux response of samples with a doubly-connected geometry as a suitable experimental searching method for the detection of BTRS ground states as well as of corresponding metastable excited state in three-band SC. The latter can be involved in a flux regime nonadiabatically switched on. Due to frustration of the three-band order parameter components topological solitons and other inhomogeneous topological states are possible and will be briefly discussed, too.