Ramsey Interferometry of Particle-Hole Pairs in Tunnel Junctions

TL;DR

This paper introduces a Ramsey interferometry technique to study real-time dynamics and dephasing effects of electron-hole pairs in tunnel junctions, revealing Coulomb blockade phenomena at lower resistances and impedance crossover control.

Contribution

It presents a novel method to probe quantum quasi-particle dynamics and Coulomb blockade effects in mesoscopic systems using Ramsey interferometry.

Findings

Coulomb blockade observed at resistances below the quantum resistance

Impedance crossover can be controlled via voltage modulation

Real-time dephasing effects of electron-hole pairs characterized

Abstract

We present a method to probe real-time dynamics in quantum mesoscopic systems using Ramsey interferometry. This allows us to explore the effect of interactions on quasi-particles in the time domain. We investigate the dephasing effects of an ohmic environment on an electron-hole pair in a tunnel junction. We show that dynamical Coulomb blockade phenomena can be observed for resistances much smaller than the quantum of resistance. Moreover, the crossover between high and low impedance limits can be probed for a constant resistance by a proper control of the voltage modulation.