Kondo time scales for quantum dots - response to pulsed bias potentials

TL;DR

This paper investigates how quantum dots in the Kondo regime respond to pulsed bias potentials, revealing faster rise times, oscillations related to Kondo peak splitting, and implications for experimental detection.

Contribution

It provides a theoretical analysis of the dynamic response of Kondo quantum dots to pulsed biases, highlighting new time scales and oscillatory behaviors not previously characterized.

Findings

Rise time is faster than fall time and typical Kondo time scales.

Large pulsed biases induce oscillations at frequencies related to Kondo peak splitting.

Oscillations persist in total charge transported, aiding experimental observation.

Abstract

The response of a quantum dot in the Kondo regime to rectangular pulsed bias potentials of various strengths and durations is studied theoretically. It is found that the rise time is faster than the fall time, and also faster than time scales normally associated with the Kondo problem. For larger values of the pulsed bias, one can induce dramatic oscillations in the induced current with a frequency approximating the splitting between the Kondo peaks that would be present in steady state. The effect persists in the total charge transported per pulse, which should facilitate the experimental observation of the phenomenon.