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Title: Proximity nanovalve with large phase-tunable thermal conductance

We propose a phase-controlled heat-flux quantum valve based on the proximity effect driven by a superconducting quantum interference proximity transistor (SQUIPT). Its operation relies on the phase-dependent quasiparticle density of states in the Josephson weak-link of the SQUIPT which controls thermal transport across the device. In a realistic Al/Cu-based setup the structure can provide efficient control of thermal current inducing temperature swings exceeding ∼100 mK, and flux-to-temperature transfer coefficients up to ∼500 mK/Φ{sub 0} below 100 mK. The nanovalve performances improve by lowering the bath temperature, making the proposed structure a promising building-block for the implementation of coherent caloritronic devices operating below 1 K.
Authors:
;  [1] ;  [2] ;  [3] ;  [4]
  1. NEST Istituto Nanoscienze-CNR and Scuola Normale Superiore, I-56127 Pisa (Italy)
  2. Centro de Física de Materiales (CFM-MPC), Centro Mixto CSIC-UPV/EHU, Manuel de Lardizabal 4, E-20018 San Sebastián (Spain)
  3. (DIPC), Manuel de Lardizabal 5, E-20018 San Sebastián (Spain)
  4. (Germany)
Publication Date:
OSTI Identifier:
22310961
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 8; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; CONTROL; CURRENTS; DENSITY; HEAT FLUX; INTERFERENCE; NANOSTRUCTURES; PROXIMITY EFFECT; SUPERCONDUCTING DEVICES; TEMPERATURE RANGE 0000-0013 K; TRANSISTORS