Interaction-induced adiabatic non-linear transport

TL;DR

This paper investigates how electron-electron interactions in an interacting quantum dot generate additional dc current through adiabatic modulation, offering a new spectroscopy method to probe interactions and ground state properties.

Contribution

It introduces a novel adiabatic transport spectroscopy technique that uses lock-in measurement of a time-averaged stability diagram to analyze interactions and ground state degeneracy.

Findings

Interaction-induced dc current observed under specific resonance conditions

Proposed spectroscopy method can probe interactions and spin states

Adiabatic modulation reveals ground state degeneracy changes

Abstract

We calculate the time-dependent non-linear transport current through an interacting quantum dot in the single-electron tunneling regime (SET). We show that an additional dc current is generated by the electron-electron interaction by adiabatic out-of-phase modulation of the gate and bias voltage. This current can arise only when two SET resonance conditions are simultaneously satisfied. We propose an adiabatic transport spectroscopy where lock-in measurement of a "time-averaged stability diagram" probes interactions, tunnel asymmetries and changes in the ground state spin-degeneracy.