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Unusual transport properties in carbon based nanoscaled materials: nanotubes and graphene
Author(s) -
Purewal M. S.,
Zhang Y.,
Kim P.
Publication year - 2006
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200669193
Subject(s) - graphene , mesoscopic physics , carbon nanotube , dirac fermion , fermi energy , nanotechnology , materials science , condensed matter physics , transport phenomena , ballistic conduction , quantum hall effect , electronic band structure , physics , quantum mechanics , electron
The massless Dirac particle moving at the speed of light has been a fascinating subject in relativistic quantum physics. Nanoscale graphitic materials, such as carbon nanotubes and graphene, now provide us with an opportunity to investigate such exotic effects in low‐energy condensed matter systems. The unique electronic band structure of graphene lattice provides a linear dispersion relation where the Fermi velocity replaces the role of the speed of light in the usual Dirac Fermion spectrum. Recent experimental studies reveal that such unconventional electronic structure in graphitic carbon leads to unique electronic transport phenomena in 1‐dimensional carbon nanotubes and 2‐dimensional graphene. Combined with semiconductor device fabrication techniques and the development of new methods of nanoscaled material synthesis/manipulation enables us to investigate mesoscopic transport phenomena in these materials. The exotic quantum transport behavior discovered in these materials, such as room temperature ballistic transport, unusual half‐integer quantum Hall effect, and a non‐zero Berrys phase in magneto‐oscillations will be discussed in the connection to Dirac Fermion description in graphitic systems. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)