skip to main content

Title: Measuring the complex admittance of a nearly isolated graphene quantum dot

We measured the radio-frequency reflection spectrum of an on-chip reflection line resonator coupled to a graphene double quantum dot (DQD), which was etched almost isolated from the reservoir and reached the low tunnel rate region. The charge stability diagram of DQD was investigated via dispersive phase and magnitude shift of the resonator with a high quality factor. Its complex admittance and low tunnel rate to the reservoir was also determined from the reflected signal of the on-chip resonator. Our method may provide a non-invasive and sensitive way of charge state readout in isolated quantum dots.
Authors:
; ; ; ; ; ; ; ; ;  [1] ;  [2]
  1. Key Laboratory of Quantum Information, Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Chinese Academy of Sciences, Hefei 230026 (China)
  2. Department of Physics and Astronomy, University of California at Los Angeles, Los Angeles, California 90095 (United States)
Publication Date:
OSTI Identifier:
22310922
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 7; 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; CHARGE STATES; GRAPHENE; QUALITY FACTOR; QUANTUM DOTS; RADIOWAVE RADIATION; READOUT SYSTEMS; REFLECTION; RESONATORS; SPECTRA; STABILITY; TUNNEL EFFECT