2012/05/08 by Yoshiki Imai, Katsunori Wakabayashi, Manfred Sigrist · 49 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Condensed matter physics #Electron #Gapless playback #Magnetic and transport properties of perovskites and related materials #Pairing #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Quasiparticle #Spin (aerodynamics) #Spin polarization #Superconductivity #cond-mat.mes-hall #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.85.174532
published in Physical Review B 85(17) (American Physical Society) · 9 pages, 13 figures, to appear in Physical Review B
arxiv created 2012/05/08 · openalex publication_date 2012/05/29 · arxiv updated 2012/06/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Motivated by Sr2RuO4, the magnetic properties of edge states in a two-band spin-triplet superconductor with electronlike and holelike Fermi surfaces are investigated assuming chiral p-wave pairing symmetry. The two bands correspond to the \ensuremathα-\ensuremathβ bands of Sr2RuO4 and are modeled within a tight-binding model including interorbital hybridization and spin-orbit coupling effects. Including superconductivity, the quasiparticle spectrum is determined by means of a self-consistent Bogoliubov--de Gennes calculation. While a full quasiparticle excitation gap appears in the bulk, gapless states form at the edges that produce spontaneous spin and/or charge currents. The spin current is the result of the specific band structure, while the charge current originates from the superconducting condensate. Together they induce a small spin polarization at the edge. Furthermore, onsite Coulomb repulsion is included to show that the edge states are unstable against the formation of a Stoner-type spin polarization of the edge states. Through spin-orbit coupling, the current- and the correlation-induced magnetism are coupled to the orientation of the chirality of the superconducting condensate. We speculate that this type of phenomenon could yield a compensation of the magnetic fields induced by currents and also explain the negative result in the recent experimental search for chiral edge currents.