Dynamical Coulomb Blockade of Shot Noise

Abstract

We observe the suppression of the finite frequency shot-noise produced by a voltage biased tunnel junction due to its interaction with a single electromagnetic mode of high impedance. The tunnel junction is embedded in a quarter wavelength resonator containing a dense SQUID array providing it with a characteristic impedance in the kOhms range and a resonant frequency tunable in the 4-6 GHz range. Such high impedance gives rise to a sizeable Coulomb blockade on the tunnel junction (roughly 30% reduction in the differential conductance) and allows an efficient measurement of the spectral density of the current fluctuations at the resonator frequency. The observed blockade of shot-noise is found in agreement with an extension of the dynamical Coulomb blockade theory.

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• Thermopower and dynamical Coulomb blockade in non-classical environments
• Robustness of equilibrium off-diagonal current fluctuation against localization of electron states in macroscopic two-dimensional systems
• Testing Kubo formula on a nonlinear quantum conductor driven far from equilibrium via power exchanges