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Opto-electronic properties of twisted bilayer graphene quantum dots
dc.creator | Tiutiunnyk A. | |
dc.creator | Duque C.A. | |
dc.creator | Caro-Lopera F.J. | |
dc.creator | Mora-Ramos M.E. | |
dc.creator | Correa J.D. | |
dc.date | 2019 | |
dc.date.accessioned | 2021-02-05T14:59:37Z | |
dc.date.available | 2021-02-05T14:59:37Z | |
dc.identifier.issn | 13869477 | |
dc.identifier.uri | http://hdl.handle.net/11407/6099 | |
dc.description | The electronic and interband optical properties of vertically coupled stacked graphene quantum dots are investigated using the tight-binding method. Both zigzag and armchair edge configurations are taken into account. In particular, the effect of the geometrical shape (triangular or circle-like) and, most prominently, of the angle of twisting between layers is mainly addressed. The optical response is analyzed from the calculated imaginary part of the dielectric function. It is found that the interband absorption threshold is highly dependent on the dot size and geometry: For armchair triangular bilayer graphene dots the optical gap exhibits a moderate increase for smaller angles of twisting, and the structure behaves as an intermediate to a wide gap semiconductor; whereas zigzag triangular bilayer graphene dots are small gap systems in which the twisting causes the appearance of zero-gap states associated with the variation of HOMO and LUMO states resulting from the breaking of zero-energy degeneracy. In the latter case, it is shown that the low-energy transitions between those states are responsible for the main optical response of the structures which indicates possible applications in the THz optoelectronics. Circular dots are chosen in commensurable configurations and also show stronger low-energy absorption thresholds. A particular feature appearing in this case is the presence of Bravais-Moiré patterns in the two-dimensional probability density distributions for large enough dot radii. © 2019 Elsevier B.V. | |
dc.language.iso | eng | |
dc.publisher | Elsevier B.V. | |
dc.relation.isversionof | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85063985896&doi=10.1016%2fj.physe.2019.03.028&partnerID=40&md5=a01eeaa51625332c7bddfbbda946703e | |
dc.source | Physica E: Low-Dimensional Systems and Nanostructures | |
dc.title | Opto-electronic properties of twisted bilayer graphene quantum dots | |
dc.type | Article | eng |
dc.rights.accessrights | info:eu-repo/semantics/restrictedAccess | |
dc.identifier.doi | 10.1016/j.physe.2019.03.028 | |
dc.relation.citationvolume | 112 | |
dc.relation.citationstartpage | 36 | |
dc.relation.citationendpage | 48 | |
dc.publisher.faculty | Facultad de Ciencias Básicas | spa |
dc.affiliation | Tiutiunnyk, A., Centro de Investigación en Ciencias, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Cuernavaca, Morelos CP 62209, Mexico, Instituto de Alta Investigación, CEDENNA, Universidad de Tarapacá, Casilla 7D, Arica, Chile | |
dc.affiliation | Duque, C.A., Grupo de Materia Condensada-UdeA, Instituto de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín, Colombia | |
dc.affiliation | Caro-Lopera, F.J., Facultad de Ciencias Básicas, Universidad de Medellín, Medellín, Colombia | |
dc.affiliation | Mora-Ramos, M.E., Centro de Investigación en Ciencias, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Cuernavaca, Morelos CP 62209, Mexico | |
dc.affiliation | Correa, J.D., Facultad de Ciencias Básicas, Universidad de Medellín, Medellín, Colombia | |
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dc.type.version | info:eu-repo/semantics/publishedVersion | |
dc.type.driver | info:eu-repo/semantics/article |
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