Voltage-driven superconducting weak link as a refrigerator for cooling of nanomechanical vibrations

Abstract

We consider a new type of cooling mechanism for a suspended nanowire acting as a weak link between two superconductive electrodes. By applying a bias voltage over the system, we show that the system can be viewed as a refrigerator for the nanomechanical vibrations, where energy is continuously transferred from the vibrational degrees of freedom to the extended quasiparticle states in the leads through the periodic modulation of the inter-Andreev level separation. The necessary coupling between the electronic and mechanical degrees of freedom responsible for this energy-transfer can be achieved both with an external magnetic or electrical field, and is shown to lead to an effective cooling of the vibrating nanowire. Using realistic parameters for a suspended nanowire in the form of a metallic carbon nanotube we analyze the evolution of the density matrix and demonstrate the possibility to cool the system down to a stationary vibron population of $\sim 0.1$. Furthermore, it is shown that the stationary occupancy of the vibrational modes of the nanowire can be directly probed from the DC current responsible for carrying away the absorbed energy from the vibrating nanowire.

10 pages, 4 figures

References in corpus (13)

• An Atomic-resolution nanomechanical mass sensor
• Cooling a nanomechanical resonator with quantum back-action
• Preparation and Detection of a Mechanical Resonator Near the Ground State of Motion
• Carbon nanotubes as ultra-high quality factor mechanical resonators
• Laser cooling of a nanomechanical resonator mode to its quantum ground state
• Back-action Evading Measurements of Nanomechanical Motion
• Ground state cooling of mechanical resonators
• Cooling carbon nanotubes to the phononic ground state with constant electron current
• Cooling a mechanical resonator via coupling to a tunable double quantum dot
• Superconducting single-mode contact as a microwave-activated quantum interferometer
• MICROWAVE-INDUCED "SOMERSAULT EFFECT" IN FLOW OF JOSEPHSON CURRENT THROUGH A QUANTUM CONSTRICTION
• Cooling of a suspended nanowire by an AC Josephson current flow
• Ground-state cooling the vibrations of suspended carbon-nanotubes with constant electron current

Cited by in corpus (2)

• Charge-vibration interaction effects in normal-superconductor quantum dots
• Selfoscillations of Suspended Carbon Nanotubes with a Deflection Sensitive Resistance under Voltage Bias