期刊
NEW JOURNAL OF PHYSICS
卷 24, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1367-2630/ac4b90
关键词
multilayer armchair graphene nanoribbons; multiple flat bands; selective localization rule; giant optical absorption; electric-field manipulation
资金
- National Natural Science Foundation of China [11347009, 11804092, 12174100]
- Hunan Provincial Natural Science Foundation [14JJ2130]
In this article, an AA-stacked multilayer graphene nanoribbon with two symmetrical armchair edges is proposed as a multiple flat-band material. By manipulating an electric field, the bandgaps and localized states of the flat bands can be controlled. Thus, these ribbons could be excellent candidates for designing controllable information transmission and optical-electric nanodevices.
We propose an AA-stacked multilayer graphene nanoribbon with two symmetrical armchair edges as a multiple flat-band (FB) material. Using the tight-binding Hamiltonian and Green's function method, we find that the FBs are complete and merged into many dispersive bands. The FBs cause multiple strongly localized states (SLSs) at the sites of the odd lines in every sublayer and a giant optical absorption (GOA) at energy point 2t, where t is the electronic intralayer hopping energy between two nearest-neighbor sites. By driving an electric field perpendicular to the ribbon plane, the bandgaps of the FBs are tunable. Accordingly, the positions of the SLSs in the energy regime can be shifted. However, the position of the GOA is robust against such field, but its strength exhibits a collapse behavior with a fixed quantization step. On the contrary, by driving an electric field parallel to the ribbon plane, the completeness of FBs is destroyed. Resultantly, the SLSs and GOA are suppressed and even quenched. Therefore, such ribbons may be excellent candidates for the design of the controllable information-transmission and optical-electric nanodevices.
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