Novel Transport Properties in Monolayer Graphene with Velocity Modulation

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2013,（4）
• 页码范围: 166-169
• 页数: 4页
• 语种: 英文
• DOI: 10.1088/0256-307X/30/4/047201

摘要

A great amount of interest has been generated in research on the physical properties of graphene[1,2]since it was realized by Novoselov et al.[3] It is found that the charge carriers of graphene behave like relativistic massless particles,then the transport of electrons and holes in such a truly two-dimensional material is governed by a massless Dirac equation.[4,5]This brings about a number of unique electronic and transport properties,such as an unconventional quantum Hall effect,[6-13] a strong electric effect,[14] finite minimal conductivity,[4,6,11,15,16] and special Andreev reflection.[17,18] It is also shown that nanostructures based on graphene may have significant potential applications in nanoelectronics.[19-21] The charge carriers at low energies of graphene can be described by a two-dimensional massless Dirac fermion model with the effective speed of light vF ≈ 106 m/s,called the Fermi velocity.[22] Recently,it is shown that the Fermi velocity of charge carriers can be modulated by appropriate doping,[23] by placing a ground metal plane close to the graphene,[24] or by imprinting a lateral superlattice with hexagonal symmetry on a twodimensional electron gas.[25] This has attracted interest in the velocity-modulation structures of graphene,because velocity-modulation control in two different regions of graphene can be regarded as a velocity barrier.