Spontaneous generation of vortices by a nonuniform Zeeman field in a two-dimensional Rashba coupled superconductor

Abstract

The interplay of the electron exchange interaction and spin-orbit coupling results in spontaneous supercurrents near magnetic insulator islands, which are placed on the top of a two-dimensional (2D) superconductor, and whose magnetization is parallel to 2D electron gas. It is shown that in contrast to the well studied situation, where such an effect involves only topologically trivial spatial variations of the superconducting order parameter, one should take into account supercurrent vortices. The latter are spontaneously generated around the island's boundary of an arbitrary shape and result in screening of the Zeeman field. This problem has been considered for electrons subject to a strong Rashba spin-orbit coupling, including Dirac systems as well. In the latter case vortices can carry Majorana zero modes.

8 pages and 2 figures

References in corpus (9)

• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Anomalous Josephson effect induced by spin-orbit interaction and Zeeman effect in semiconductor nanowires
• Anomalous Josephson Current in Junctions with Spin-Polarizing Quantum Point Contacts
• Theory of 2D superconductor with broken inversion symmetry
• Magnetoelectrics in Disordered Topological Insulator Josephson Junctions
• Imaging Josephson Vortices on the Surface Superconductor Si(111)-(root7xroot3)-In using a Scanning Tunneling Microscope
• Conversion of a conventional superconductor into a topological superconductor by topological proximity effect
• Novel self-epitaxy for inducing superconductivity in the topological insulator (Bi1-xSbx)2Te3
• Supercurrent vortices and Majorana zero modes induced by an inplane Zeeman field on the surface of a three-dimensional topological insulator

Cited by in corpus (6)

• Hybrid helical state and superconducting diode effect in S/F/TI heterostructures
• Magnetoelectric effects in Josephson junctions
• Anatomy of Spin and Current Generation from Magnetization Gradients in Topological Insulators and Rashba Metals
• Anomalous currents and spontaneous vortices in spin-orbit coupled superconductors
• Perspectives on Magnetic/Superconductor Hybrid Systems: Long-range Electromagnetic Phenomena Induced by Proximity Effect and Interfacial Spin-orbit Coupling
• Hybrid collective excitations in topological superconductor/ferromagnetic insulator heterostructures