Dynamical Coulomb Blockade of Shot Noise

Carles Altimiras (1) , Olivier Parlavecchio (1) , Philippe Joyez (2) , Denis Vion (2) , Patrice Roche (1) , Daniel Esteve (2) , Fabien Portier (1)

1 GNE - Groupe Nano-Electronique
2 QUANTRONICS - Quantronics Group

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.

Domains: Physics [physics]

Carles Altimiras, Olivier Parlavecchio, Philippe Joyez, Denis Vion, Patrice Roche, et al.. Dynamical Coulomb Blockade of Shot Noise. Physical Review Letters, 2014, 112 (23), pp.236803. ⟨10.1103/PhysRevLett.112.236803⟩. ⟨cea-01384659⟩