Electrically controllable spin filtering based on superconducting helical states

Abstract

The magnetoelectric effects in the surface states of the 3D TI are extremely strong due to the full spin-momentum locking. Here the microscopic theory of S/3D TI bilayer structures in terms of quasiclassical Green's functions is developed. On the basis of the developed formalism it is shown that the DOS in the S/TI bilayer manifests giant magnetoelectric behavior and, as a result, S/3D TI heterostructures can work as non-magnetic fully electrically controllable spin filters. It is shown that due to the full spin-momentum locking the amplitudes of the odd-frequency singlet and triplet components of the consensate wave function are equal. The same is valid for the even frequency singlet and triplet components. We unveil the connection between the odd-frequency pairing in S/3D TI heterostructures and magnetoelectric effects in the DOS.

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Cited by in corpus (8)

• Hybrid helical state and superconducting diode effect in S/F/TI heterostructures
• Magnetoelectric effects in Josephson junctions
• Magnetoelectric effects in superconductor/ferromagnet bilayers
• Hybridization mechanism of the dual proximity effect in superconductor-topological insulator interfaces
• Bound fermion states in pinned vortices in the surface states of a superconducting topological insulator: The Majorana bound state
• Proximity Effect in Superconducting Heterostructures with Strong Spin-Orbit Coupling and Spin Splitting
• Probing the magnetoelectric effect in noncentrosymmetric superconductors by equal-spin Andreev tunneling
• Hybrid collective excitations in topological superconductor/ferromagnetic insulator heterostructures