Quantum Pumping and Quantized Magnetoresistance in a Hall Bar

TL;DR

This paper demonstrates how a dc current can be generated in a Hall bar without bias, with quantized Hall resistance and a non-zero longitudinal resistance, revealing novel quantum pumping phenomena.

Contribution

It introduces a method for quantum pumping in a Hall bar that results in quantized Hall resistance with non-zero longitudinal resistance, differing from traditional IQHE.

Findings

Quantized Hall resistance without bias voltage

Longitudinal resistance equals Hall resistance on plateaus

Proposed experimental setup for verification

Abstract

We show how a dc current can be generated in a Hall bar without applying a bias voltage. The Hall resistance $R_H$ that corresponds to this pumped current is quantized, just as in the usual integer quantum Hall effect (IQHE). In contrast with the IQHE, however, the longitudinal resistance $R_{xx}$ does not vanish on the plateaus, but equals the Hall resistance. We propose an experimental geometry to measure the pumped current and verify the predicted behavior of $R_H$ and $R_{xx}$.