• 文献标题:   Electric and magnetic superlattices in trilayer graphene
  • 文献类型:   Article
  • 作  者:   UDDIN S, CHAN KS
  • 作者关键词:   graphene, magnetic superlattice, band structure
  • 出版物名称:   PHYSICA ELOWDIMENSIONAL SYSTEMS NANOSTRUCTURES
  • ISSN:   1386-9477 EI 1873-1759
  • 通讯作者地址:   City Univ Hong Kong
  • 被引频次:   2
  • DOI:   10.1016/j.physe.2015.09.001
  • 出版年:   2016

▎ 摘  要

The properties of one dimensional Kronig-Penney type of periodic electric and vector potential on ABC-trilayer graphene superlattices are investigated. The energy spectra obtained with periodic vector potentials shows the emergence of extra Dirac points in the energy spectrum with finite energies. For identical barrier and well widths, the original as well as the extra Dirac points are located in the k(y)=0 plane. An asymmetry between the barrier and well widths causes a shift in the extra Dirac points away from the k(y)=0 plane. Extra Dirac points having same electron hole crossing energy as that of the original Dirac point as well as finite energy Dirac points are generated in the energy spectrum when periodic electric potential is applied to the system. By applying electric and vector potential together, the symmetry of the energy spectrum about the Fermi level is broken. A tunable band gap is induced in the energy spectrum by applying both electric and vector potential simultaneously with different barrier and well widths. (C) 2015 Elsevier B.V. All rights reserved.