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Title: Experimental determination of the elastic cotunneling rate in a hybrid single-electron box

We report measurements of charge configurations and charge transfer dynamics in a hybrid single-electron box composed of aluminum and copper. We used two single-electron transistors (SETs) to simultaneously read out different parts of the box, enabling us to map out stability diagrams of the box and identify various charge transfer processes in the box. We further characterized the elastic cotunneling in the box, which is an important source of error in electron turnstiles consisting of hybrid SETs, and found that the rate was as low as 1 Hz at degeneracy and compatible with theoretical estimates for electron tunneling via virtual states in the central superconducting island of the box.
Authors:
; ;  [1] ; ;  [2] ;  [3]
  1. Department of Physics, National Central University, Jhongli 32001, Taiwan (China)
  2. Department of Physics, National Changhua University of Education, Changhua 500, Taiwan (China)
  3. Department of Physics, National Tsing-Hua University, Hsinchu 30013, Taiwan (China)
Publication Date:
OSTI Identifier:
22300032
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 23; 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; ALUMINIUM; CHARGE TRANSPORT; CONFIGURATION; COPPER; ELECTRONS; HYBRIDIZATION; READOUT SYSTEMS; STABILITY; TRANSISTORS; TUNNEL EFFECT; VIRTUAL STATES