Fischer Marcelo Macedo, de Sousa Leonardo Evaristo, Luiz E Castro Leonardo, Ribeiro Luiz Antonio, de Sousa Rafael Timóteo, Magela E Silva Geraldo, de Oliveira Neto Pedro Henrique
Institute of Physics, University of Brasilia, 70.919-970, Brasilia, Brazil.
University of Brasília, PPG-CIMA, Campus Planaltina, 73345-010, Brasília, DF, Brazil.
Sci Rep. 2019 Nov 29;9(1):17990. doi: 10.1038/s41598-019-54319-3.
Armchair graphene nanoribbons (AGNRs) may present intrinsic semiconducting bandgaps, being of potential interest in developing new organic-based optoelectronic devices. The induction of a bandgap in AGNRs results from quantum confinement effects, which reduce charge mobility. In this sense, quasiparticles' effective mass becomes relevant for the understanding of charge transport in these systems. In the present work, we theoretically investigate the drift of different quasiparticle species in AGNRs employing a 2D generalization of the Su-Schrieffer-Heeger Hamiltonian. Remarkably, our findings reveal that the effective mass strongly depends on the nanoribbon width and its value can reach 60 times the mass of one electron for narrow lattices. Such underlying property for quasiparticles, within the framework of gap tuning engineering in AGNRs, impact the design of their electronic devices.
扶手椅型石墨烯纳米带（AGNRs）可能具有本征半导体带隙，这使其在开发新型有机基光电器件方面具有潜在的吸引力。AGNRs中带隙的产生源于量子限制效应，这种效应会降低电荷迁移率。从这个意义上说，准粒子的有效质量对于理解这些系统中的电荷传输至关重要。在本工作中，我们使用Su-Schrieffer-Heeger哈密顿量的二维推广，从理论上研究了不同准粒子种类在AGNRs中的漂移。值得注意的是，我们的研究结果表明，有效质量强烈依赖于纳米带宽度，对于窄晶格，其值可达一个电子质量的60倍。在AGNRs的能隙调谐工程框架内，准粒子的这种基本特性会影响其电子器件的设计。
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