203 research outputs found
Single Flux Transistor: the controllable interplay of Coherent Quantum Phase Slip and Flux quantization
The Single Cooper Pair Josephson Transistor is a device that exhibits at the
same time charge quantization and phase coherence. Coherent quantum phase slip
phenomenon is "dual" the Josephson phase coherence while the charge
quantization is dual to the flux quantization. We present the experimental
demonstration and the theoretical description of a new superconducting device -
Single Flux Transistor, which is dual to the Single Cooper Pair Transistor. Our
transport measurements show the periodic modulation of the critical voltage by
the external magnetic field. The obtained current-voltage characteristics show
the hysteretic behavior, which we attribute to the intrinsic self-heating of
charge carriers.Comment: 5 pages, 4 figure
Charge transport through a SET with a mechanically oscillating island
We consider a single-electron transistor (SET) whose central island is a
nanomechanical oscillator. The gate capacitance of the SET depends on the
mechanical displacement, thus, the vibrations of the island vibrations may
strongly influence the current-voltage characteristics, current noise, and
higher cumulants of the current. Harmonic oscillations of the island and
oscillations with random amplitude (e.g., due to the thermal activation) change
the transport characteristics in a different way. The noise spectrum has a peak
at the frequency of the island oscillations; when the island oscillates
harmonically, the peak reduces to a -peak. We show that knowledge of
the SET transport properties helps to determine in what way the island
oscillates, to estimate the amplitude, and the frequency of the oscillations
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