Ramsey Interferometry of Particle-Hole Pairs in Tunnel Junctions
  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. 
Tal Goren, Karyn Le Hur, Eric Akkermans
cond-mat.mes-hall