• A
  • A
  • A
  • ABC
  • ABC
  • ABC
  • А
  • А
  • А
  • А
  • А
Regular version of the site
Menu

Article

Supercurrent vortices and Majorana zero modes induced by an in-plane Zeeman field on the surface of a three-dimensional topological insulator

Physical Review B: Condensed Matter and Materials Physics. 2020. Vol. 101. P. 134514-1-134514-7.
Mal'shukov A.

A nonuniform in-plane Zeeman field can induce spontaneous supercurrents of spin-orbit-coupled electrons in
superconducting two-dimensional systems and thin films. In this work it is shown that current vortices can be
created at the ends of a long homogeneously magnetized strip of a ferromagnetic insulator, which is deposited on
the surface of a three-dimensional topological insulator. The s-wave superconductivity on its surface is assumed
to have an intrinsic origin, or to be induced by the proximity effect. It is shown that vortices with the odd vorticity
can localize Majorana zero modes. The latter may also be induced by sufficiently narrow domain walls inside
the strip, which opens a way for manipulating these modes by moving the walls. It is shown that the vorticity can
be tuned by varying the magnetization and width of the strip. A stability of the strip magnetization with respect
to the Berezinsky-Kosterlitz-Thouless transition has been analyzed.