期刊
PHYSICAL REVIEW B
卷 78, 期 12, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.125409
关键词
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资金
- Acceleration Research [R17-2008-007-01001-0]
- Pure Basic Research [R01-2006-000-11248-0]
- Korea Research Foundation [KRF-2005-070-C00055]
- National Research Foundation of Korea [R01-2006-000-11248-0, 2005-070-C00055, 과06A1105, R17-2008-007-01001-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Charge carriers in a graphene sheet, a single layer of graphite, exhibit distinct characteristics from those in other two-dimensional electronic systems because of their chiral nature. In this paper, we focus on the observation of weak localization in a graphene sheet exfoliated from a piece of natural graphite and nanopatterned into a Hall-bar geometry. Much stronger chiral-symmetry-breaking elastic intervalley scattering in our graphene sheet restores the conventional weak localization. The resulting carrier density and temperature dependence of the phase coherence length reveal that the electron-electron interaction including a direct Coulomb interaction is the main inelastic-scattering factor while electron-hole puddles enhance the inelastic scattering near the Dirac point.
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