| Abstract: | We provide a method to probe dynamics in quantum mesoscopic systems which yields new results. Using Ramsey interference allows us to explore the time-dependence of dephasing effects of quasi-particles in a mesoscopic conductor. We investigated the dephasing effects of an ohmic environment on an electron-hole pair in a tunnel junction and found that the crossover between high and low impedance corresponds to the crossover between the ballistic and diffusive motion of a quantum brownian particle.
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