期刊
PHYSICAL REVIEW B
卷 95, 期 20, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.95.205419
关键词
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资金
- sp2-bonded Materials Program - Director, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division of the US Department of Energy [KC2207, DE-AC02-05CH11231]
- Director, Office of Science, Office of Basic Energy Sciences, Scientific User Facilities Division of the US Department of Energy [DE-AC02-05CH11231]
- National Science Foundation [DMR-1206512]
- EPSRC [EP/J015059/1, EP/N005244/1]
- Thomas Young Centre [TYC-101]
- Imperial College London High Performance Computing Service(numerical algorithm development)
- HEC Materials Chemistry Consortium
- US Department of Defense through the National Defense Science & Engineering Graduate Fellowship (NDSEG) [32 CFR 168a]
- EPSRC [EP/L000202/1, EP/J015059/1, EP/N005244/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/L000202/1, EP/N005244/1, EP/J015059/1] Funding Source: researchfish
Electrons in two-dimensional graphene sheets behave as interacting chiral Dirac fermions and have unique screening properties due to their symmetry and reduced dimensionality. By using a combination of scanning tunneling spectroscopy measurements and theoretical modeling we have characterized how graphene's massless charge carriers screen individual charged calcium atoms. A backgated graphene device configuration has allowed us to directly visualize how the screening length for this system can be tuned with carrier density. Our results provide insight into electron-impurity and electron-electron interactions in a relativistic setting with important consequences for other graphene-based electronic devices.
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