Dresden 2011 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 10: Poster Session: Superconductivity

TT 10.49: Poster

Montag, 14. März 2011, 14:00–18:00, P4

Charge transport through 1D arrays of small capacitance Josephson junctions with uniform voltage bias — •Jochen Zimmer¹, Roland Schäfer², Hannes Rotzinger¹, and Alexey V. Ustinov¹ — ¹Physikalisches Institut, Karlsruhe Institut of Technology — ²Institut für Festkörperphysik, Karlsruhe Institut of Technology

We investigate one-dimensional arrays of small capacitance Josephson junctions fabricated by conventional e-beam lithography techniques. The arrays are designed to operate in the vicinity of the Coulomb blockade regime. It has been suggested that charges propagate though these arrays in a form similar to solitary waves, described by the sine-Gordon model. This system is dual to a long Josephson junction, in which magnetic flux solitons have been thoroughly investigated in the past. Localized charge excitations could be of metrological interest because they might offer access to very accurate frequency-to-current conversion (I = 2e f). In conventional setups, the bias voltage is only applied to the edges of the array, decaying exponentially from junction to junction. In order to achieve uniform force on charge carriers in the array, the voltage drop from junction to junction must be uniform. We present fabricated arrays with a uniform biasing scheme and first measurements thereof. We also show measurement results of similar arrays under rf radiation obtained at millikelvin temperatures.