Resonant transport in Kekulé-distorted graphene nanoribbons
Por:
Andrade, Elias, Carrillo-Bastos, Ramon, Pantaleon, Pierre A., Mireles, Francisco
Publicada:
1 ene 2020
Categoría:
Physics and astronomy (miscellaneous)
Resumen:
The formation of a superlattice in graphene can serve as a way to modify its electronic band structure and thus to engineer its electronic transport properties. Recent experiments have discovered a Kekulé bond ordering in graphene deposited on top of a copper substrate, leading to the breaking of the valley degeneracy while preserving the highly desirable feature of linearity and gapless character of its band dispersion. In this paper, we study the effects of a Kekulé distortion in zigzag graphene nanoribbons in both the subband spectrum and on its electronic transport properties. We extend our study to also investigate the electronic conductance in graphene nanoribbons composed of sequentially ordered ? = ± 1 Kek-Y superlattices. We find interesting resonances in the conductance response emerging in the otherwise energy gap regions, which scales with the number of Kek-Y interfaces minus one. Such features resemble the physics of resonant tunneling behavior observed in semiconductor heterostructures. Our findings provide a possible way to measure the strength of the Kekulé parameter in graphene nanoribbons. © 2020 Author(s).
Filiaciones:
Andrade, Elias:
Facultad de Ciencias, Universidad Autónoma de Baja California, Apdo. Postal 1880, Ensenada, Baja California, 22800, Mexico
Depto. de Sistemas Complejos, Instituto de Física, Universidad Nacional Autónoma de México (UNAM), Apdo. Postal 20-364, México D.F., 01000, Mexico
Univ Autonoma Baja California, Fac Ciencias, Apdo Postal 1880, Ensenada 22800, Baja California, Mexico
Univ Nacl Autonoma Mexico, Inst Fis, Dept Sistemas Complejos, Apdo Postal 20-364, Mexico City 01000, DF, Mexico
Carrillo-Bastos, Ramon:
Facultad de Ciencias, Universidad Autónoma de Baja California, Apdo. Postal 1880, Ensenada, Baja California, 22800, Mexico
Univ Autonoma Baja California, Fac Ciencias, Apdo Postal 1880, Ensenada 22800, Baja California, Mexico
Pantaleon, Pierre A.:
School of Physics and Astronomy, University of Manchester, Manchester, M13 9PL, United Kingdom
IMDEA Nanociencia, C. Faraday 9, Madrid, 28015, Spain
Univ Manchester, Sch Phys & Astron, Manchester M13 9PL, Lancs, England
IMDEA Nanociencia, C Faraday 9, Madrid 28015, Spain
Mireles, Francisco:
Departamento de Física, Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Apdo. Postal 14, Ensenada, Baja California, 22800, Mexico
Univ Nacl Autonoma Mexico, Dept Fis, Ctr Nanociencias & Nanotecnol, Apdo Postal 14, Ensenada 22800, Baja California, Mexico
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