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Superconducting circuits that incorporate Josephson junctions are of considerable experimental and theoretical interest, particularly in the context of quantum computing. A nanometre-sized superconducting grain (commonly referred to as a Cooper-pair box) connected to a reservoir by a Josephson junction is an important example of such a system. Although the(More)
An analytical analysis of quantum shuttle phenomena in a nanoelectromechanical single-electron transistor has been performed in the realistic case, when the electron tunneling length is much greater than the amplitude of the zero point oscillations of the central island. It is shown that when the dissipation is below a certain threshold value, the(More)
We demonstrate that it is possible to manipulate the magnetic coupling between two nanomagnets by means of an ac electric field. In the scheme suggested, the magnetic coupling is mediated by a magnetic particle that is in contact with both nanomagnets via tunnel barriers. The time-dependent electric field is applied so that the height of first one barrier(More)
We consider a nanoelectromechanical Josephson junction, where a suspended nanowire serves as a superconducting weak link, and show that an applied dc bias voltage can result in suppression of the flexural vibrations of the wire. This cooling effect is achieved through the transfer of vibronic energy quanta first to voltage-driven Andreev states and then to(More)
PACS. 73.63.-b – Electronic transport in mesoscopic or nanoscale materials and structures.. PACS. 73.23.Hk – Coulomb blockade; single-electron tunneling. PACS. 85.85.+j – Micro-and nano-electromechanical systems (MEMS/NEMS) and devices. Abstract. – Effects of a coupling between the mechanical vibrations of a quantum dot placed between the two leads of a(More)
We consider effects of the spin degree of freedom on the nanomechanics of a single-electron transistor (SET) containing a nanometer-sized metallic cluster suspended between two magnetic leads. It is shown that in such a nanoelectromechanical SET (NEM-SET) the onset of an electromechanical instability leading to cluster vibrations and shuttle transport of(More)
We show that the vibrations of a nanomechanical resonator can be cooled to near its quantum ground state by tunneling injection of electrons from a scanning tunneling microscope tip. The interplay between two mechanisms for coupling the electronic and mechanical degrees of freedom results in a bias-voltage-dependent difference between the probability(More)
In this paper, we develop a physical analysis of charge transfer in the model 'metallo-enzyme' complex which consists of a synthetic redox-addressed assembly (a 'reaction center') hybridized with a quantum dot (a gold nanoparticle) and attached via molecular bridge (a spacer) to the electrode. This artificial system allows us to model electronic(More)
We have considered resonant tunneling through a double tunnel junction where the central island has a mechanical degree of freedom controlling its position with respect to the electrodes. The effects of the coupling between mechanical vibrations of the dot and resonant tunneling of electrons have been studied under the assumption that there is only one(More)
Effects of irradiation on the electronic conductance in nanowires, for field-free conditions and under the influence of applied longitudinal magnetic fields, were investigated. The nanowires were modeled within the free-electron framework with a parabolic ͑transverse͒ confining potential. Our results for the dependence of the photoconductance of irradiated(More)