Fraunhofer oscillations of the critical current at a varying Zeeman field in a spin-orbit coupled Josephson junction

Physical Review B: Condensed Matter and Materials Physics. 2020. Vol. 102. P. 134509-1–134509-5.

Mal'shukov A.

The Zeeman interaction results in spontaneous current through a Josephson contact with a spin-orbit coupled
normal metal, even in the absence of any voltage, or phase bias. In the case of the Rashba spin-orbit coupling
of electrons in a two-dimensional (2D) electron gas this effect takes place for the Zeeman field which is parallel
to the 2D system and to superconducting contacts. At the same time, the spontaneous current is absent when
this field is perpendicular to the contacts. It is shown that in the latter case it may manifest itself in oscillations
of the critical Josephson current at varying Zeeman energy. These oscillations have a form of the Fraunhofer
diffraction pattern. The Josephson current under the phase bias was calculated based on the semiclassical Green’s
functions for a disordered 2D electron gas with the strong spin-orbit coupling, as well as for surface electrons
of a three-dimensional topological insulator. In the latter case the diffraction pattern was found to be most
pronounced, while in the Rashba gas the oscillations of the critical current are weaker.

Keywords: эффект Джозефсона, Josephson effect, spin-orbit coupling, спин-орбитальная связь, Fraunhofer oscillations, осцилляции Фраунгофера