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Title: Enhanced quantum coherence in graphene caused by Pd cluster deposition

We report on the unexpected increase in the dephasing lengths of a graphene sheet caused by the deposition of Pd nanoclusters, as demonstrated by weak localization measurements. The dephasing lengths reached saturated values at low temperatures. Theoretical calculations indicate the p-type charge transfer from the Pd clusters, which contributes more carriers. The saturated values of dephasing lengths often depend on both the carrier concentration and mean free path. Although some impurities are increased as revealed by decreased mobilities, the intense charge transfer leads to the improved saturated values and subsequent improved dephasing lengths.
Authors:
; ; ; ; ; ;  [1] ;  [2] ;  [3] ;  [4] ;  [5]
  1. National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, and Department of Physics, Nanjing University, Nanjing 210093 (China)
  2. Key Lab of Quantum Information, CAS, University of Science and Technology of China, Hefei 230026 (China)
  3. Collaborative Innovation Center of Advanced Microstructures, State Key Laboratory of Coordination Chemistry, and School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093 (China)
  4. High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230027 (China)
  5. School of Electronic Science and Engineering and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093 (China)
Publication Date:
OSTI Identifier:
22399127
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 2; Other Information: (c) 2015 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; ABUNDANCE; CONCENTRATION RATIO; DEPOSITION; GRAPHENE; IMPURITIES; MEAN FREE PATH; MOBILITY; NANOSTRUCTURES; PALLADIUM; P-TYPE CONDUCTORS; SHEETS; SOLID CLUSTERS; TEMPERATURE DEPENDENCE