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Special seminars TRR80


11.10.2018 4:15 p.m., room: S-288
Prof. Dr. Hiroshi Yasuoka (Max-Planck-Institut für chemische Physik fester Stoffe, Dresden)
Weyl fermion excitations in transition metal pnictides explored by 93Nb NMR and 181Ta NQR
30.10.2018 4 p.m., room: S-288
Prof. Dr. Markus J. Aichhorn (TU Graz)
Strong Correlations and Spin-Orbit Coupling: Models and Materials
17.1.2019 2:30 p.m., room: S-403
Prof. Dr. Sándor Bordács (BUTE, Budapest)
Detection of antiferromagnetic domains by optical magnetoelectric effect
29.1.2019 4 p.m., room: S-288
Dr. Maia G. Vergniory (Donostia International Physics Center, Ikerbasque)
Higher Order Topological Insulators from Elementary Band Representations Theory
22.2.2019 10:30 a.m., room: S-288
Prof. Dr. Andrei Pimenov (Institut für Festkörperphysik, TU Wien)
Topological insulators: quantized Faraday rotation and the band structure
19.3.2019 4 p.m., room: S-403
Prof. Dr. Sergey Artyukhin (Italian Institute of Technology (IIT), Genoa)
Sliding domain walls in ferroelectrics and multiferroics
22.3.2019 2 p.m., room: S-288
Dr. F. Sebastián Bergeret (Materials Physics Center, CSIC, Spain)
Universal correspondence between edge spin accumulation and equilibrium spin-currents in nanowires

Although equilibrium spin currents (ESC) may exist in materials with spin-orbit coupling, they are not transport currents and cannot lead to spin accumulation in the presence of time-reversal symmetry. It is for this reason that the detection of ESC has remained elusive. Here we show that in a nanowire with spin-orbit coupling, a Zeeman field leads to a bulk equilibrium spin current that flows along the wire and manifests itself in a sizable edge spin polarization, transverse to the Zeeman field. The net accumulated spin does not depend on specific properties of the wire ends, being fully determined by the bulk spin current. This bulk-boundary correspondence is a universal property that occurs in both, the normal and superconducting state, independently of the degree of disorder. The transverse edge spin polarization is strongly enhanced in the superconducting state when the Zeeman energy is of the order of the induced superconducting gap. This leads to a hitherto unknown transverse magnetic susceptibility that can be much larger than the longitudinal one and it drastically changes the paramagnetic response of the nanowire.