Theory of topological spin current in noncentrosymmetric superconductors

2008/06/30 by Yukio Tanaka, Takehito Yokoyama, Alexander V. Balatsky +1 · 15 citations
Physics and Astronomy · #Quantum and electron transport phenomena #Rare-earth and actinide compounds #Topological Materials and Phenomena #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.79.060505

arxiv created 2008/10/19 · openalex publication_date 2009/02/10 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We study the spin transport properties of the noncentrosymmetric superconductor with time-reversal symmetry where spin-triplet (p_x\ifmmode±\else\textpm\fiip_y)-wave and spin-singlet s-wave pair potentials can mix with each other. We show that when the amplitude of the (p_x\ifmmode±\else\textpm\fiip_y)-wave pair potential is larger than that of s-wave one, the superconducting state belongs to the topologically nontrivial class analogous to the quantum spin Hall system, and the resulting helical edge modes as Andreev bound states are topologically protected. We find that the incident angle dependent spin polarized current flows through the interface due to the presence of the helical edge modes. With a weak magnetic field, also the angle-integrated current is strongly spin polarized.

Citations

• Topological Insulators with Inversion Symmetry
• Time Reversal Polarization and a Z₂ Adiabatic Spin Pump

Cited by

• Topology of Andreev bound states with flat dispersion
• Helical spin texture of surface states in topological superconductors
• Quantum impurity spin in Majorana edge fermions
• Evolution of Edge States and Critical Phenomena in the Rashba Superconductor with Magnetization
• Majorana fermions in a tunable semiconductor device
• Majorana fermions and odd-frequency Cooper pairs in a normal-metal nanowire proximity-coupled to a topological superconductor
• Weak ferromagnetism in a noncentrosymmetric BiPd 4 K superconductor
• Edge instabilities of topological superconductors
• Shubnikov - de Haas oscillations, weak antilocalization effect and large linear magnetoresistance in the putative topological superconductor LuPdBi
• Pairing state at an interface of Sr2RuO4: parity-mixing, restored time-reversal symmetry and topological superconductivity
• Intrinsic topological superconductivity with exactly flat surface bands in the quasi-one-dimensional A2Cr3As3 (A=Na, K, Rb, Cs) superconductors
• Emergence of non-centrosymmetric topological insulating phase in BiTeI under pressure
• From Kondo lattices to Kondo superlattices
• Effect of helical edge states on the tunneling conductance in ferromagnet/noncentrosymmetric superconductor junction
• Superconducting spintronics

Related

• Spin-polarized edge modes between different magnet-superconductor-hybrids
• Charge and Spin Transport in Superconducting Weak Links
• Same-spin Andreev reflections in the quantum Hall regime: the role of loss
• Andreev bound states in normal and ferromagnet/high-Tc superconducting tunnel junctions
• Tunneling conductance in superconducting junctions with p-wave unconventional magnets breaking time-reversal symmetry