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http://ricaxcan.uaz.edu.mx/jspui/handle/20.500.11845/1562
Title: | Pseudospin-dependent Zitterbewegung in monolayer graphene |
Authors: | Serna, Eduardo Rodríguez Vargas, Isaac Pérez Álvarez, Rolando Diago Cisneros, Leovildo |
Issue Date: | 23-May-2019 |
Publisher: | American Institute of Physics |
Abstract: | We propose a spintronic device based on a narrow nanoribbon patterned from a monolayer graphene (MLG) sheet, embedded between a film of hexagonal boron nitride and a SiO2 substrate, all comprised under a three top-gated structure, to explore spin-dependent quantum transport of Dirac fermions. We developed a theoretical procedure for describing the pseudospin-related effects and the dynamics of Dirac fermions represented by a one-dimensional Gaussian wave packet (1DGWP), which is electrostatically confined in the device. The free-space 1DGWP time evolution follows expected features. Meanwhile, due to the weak breakdown of the real-spin degeneracy, the 1DGWP barely splits inside the under-barrier region governed by the extrinsic Rashba spin–orbit interaction (SOI-R). Most importantly, departing from the pristine MLG, we have found evidence of trembling antiphase oscillations in the probability density time-distribution for each sublattice state, which we have called the pseudospinorial Zitterbewegung effect (PZBE). The PZBE appears modulated with robust transient character and with a decay time in the femtosecond scale. Interestingly, several features of the PZBE become tunable, even its complete disappearance at the vicinity of the Dirac points or at a symmetric pseudospin configuration. For the proposed quasi-1D MLG device, we have captured evidence of the familiar Klein tunneling and the unusual anti-Klein tunneling, whose interplay for 2D MLG under tunable SOI-R was reported recently. |
URI: | http://ricaxcan.uaz.edu.mx/jspui/handle/20.500.11845/1562 https://doi.org/10.48779/26jg-hc12 |
ISSN: | 0021-8979 |
Other Identifiers: | info:eu-repo/semantics/publishedVersion |
Appears in Collections: | *Documentos Académicos*-- UA Cien. y Tec. de la Luz y la Mat. (LUMAT) |
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ESerna2019JAP.pdf | 2,58 MB | Adobe PDF | View/Open |
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