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Dynamical Coulomb Blockade of Shot Noise

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arxiv 1403.5999 v2 pith:G4HVTCAZ submitted 2014-03-24 cond-mat.mes-hall

Dynamical Coulomb Blockade of Shot Noise

C. Altimiras , O. Parlavecchio , P. Joyez , D. Vion , P. Roche , D. Esteve , F. Portier This is my paper
classification cond-mat.mes-hall
keywords blockadecoulombfrequencyimpedancejunctiontunneldynamicalhigh
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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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