• 文献标题:   Novel version of the Fibonacci superlattices formed of graphene nanoribbons: Transmission spectra
  • 文献类型:   Article, Proceedings Paper
  • 作  者:   KOROL AM, LITVYNCHUK SI
  • 作者关键词:   fibonacci superlattice, graphene, nanoribbon, transmission spectra
  • 出版物名称:   PHYSICA STATUS SOLIDI BBASIC SOLID STATE PHYSICS
  • ISSN:   0370-1972 EI 1521-3951
  • 通讯作者地址:   ISIR
  • 被引频次:   1
  • DOI:   10.1002/pssb.201600381
  • 出版年:   2017

▎ 摘  要

The energy spectra of a novel version of graphene-based Fibonacci superlattices (SL) are calculated. A new quasiperiodical factor is considered. The SL is built of graphene nanoribbons (GNR) and the quasi-periodicity is formed due to the fact that different ribbons are used as individual elements of the SL and are placed along the lattice growth axis in accordance with the Fibonacci inflation rule. In one case, the SL is composed of smooth-edges and a metal-like armchair NR, and we propose to use a metal-like and a semiconductor armchair NR for another case. It is shown that: (i) the difference in values of the quantized transverse quasi-momentum of electrons for different NR is fully enough to form an effective quasi-periodic modulation in the given structure (no additional factors are needed), and the range of the ribbon widths for this purpose is determined; (ii) it is important that this range is suitable for practice. We also analyze the dependence of the energy spectra of the studied structure on the geometric parameters of the superlattice as well as on the external electrostatic potential. Attention is drawn, in particular, that in each Fibonacci generation there is the Dirac superlattice gap. Varying the nanoribbons width one can change the spectra investigated flexibly. The conductance of the structure studied is also calculated. The results obtained can be useful in determining the optimum parameters of devices of the graphene-based nanoelectronics.