# AC anomalous Hall effect in topological insulator Josephson junctions

## TL;DR

This paper investigates the nonstationary anomalous Hall current in a topological insulator Josephson junction under voltage bias, revealing oscillatory behavior and dependence on electric potential, within a ballistic approximation and weak tunneling regime.

## Contribution

It introduces a theoretical analysis of the nonstationary Hall effect in TI-based Josephson junctions, highlighting oscillatory currents and their phase relationship, absent in stationary phase conditions.

## Key findings

- Hall current oscillates in time with a phase shift of π/2
- Amplitude decreases linearly with voltage difference
- No Hall current induced by stationary phase difference

## Abstract

A nonstationary anomalous Hall current is calculated for a voltage biased Josephson junction, which is composed of two s-wave superconducting contacts deposited on the top of a three dimensional topological insulator (TI). A homogeneous Zeeman field was assumed at the surface of TI. The problem has been considered within the ballistic approximation and on the assumption that tunneling of electrons between contacts and the surface of TI is weak. In this regime the Josephson current has no features of the $4\pi$-periodic topological effect which is associated with Andreev bound states. It is shown that the Hall current oscillates in time. The phase of these oscillations is shifted by $\pi/2$ with respect to the Josephson current and their amplitude linearly decreases with the electric potential difference between contacts. It is also shown that the Hall current cannot be induced by a stationary phase difference of contact's order parameters.