English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/140314
Compartir / Impacto:
Estadísticas
Add this article to your Mendeley library MendeleyBASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Título

Generic helical edge states due to Rashba spin-orbit coupling in a topological insulator

AutorOrtiz, Laura; Molina, Rafael A. ; Platero, Gloria ; Lunde, A. M.
Fecha de publicación20-may-2016
EditorAmerican Physical Society
CitaciónPhysical Review B 93: 205431 (2016)
ResumenWe study the helical edge states of a two-dimensional topological insulator without axial spin symmetry due to the Rashba spin-orbit interaction. Lack of axial spin symmetry can lead to so-called generic helical edge states, which have energy-dependent spin orientation. This opens the possibility of inelastic backscattering and thereby nonquantized transport. Here we find analytically the new dispersion relations and the energy dependent spin orientation of the generic helical edge states in the presence of Rashba spin-orbit coupling within the Bernevig-Hughes-Zhang model, for both a single isolated edge and for a finite width ribbon. In the single-edge case, we analytically quantify the energy dependence of the spin orientation, which turns out to be weak for a realistic HgTe quantum well. Nevertheless, finite size effects combined with Rashba spin-orbit coupling result in two avoided crossings in the energy dispersions, where the spin orientation variation of the edge states is very significantly increased for realistic parameters. Finally, our analytical results are found to compare well to a numerical tight-binding regularization of the model. ©2016 American Physical Society
Descripción19 págs.; 11 figs.; 1 tab.; 5 apéndices
Versión del editorhttps://doi.org/10.1103/PhysRevB.93.205431
URIhttp://hdl.handle.net/10261/140314
DOI10.1103/PhysRevB.93.205431
Identificadoresdoi: 10.1103/PhysRevB.93.205431
issn: 1550-235X
Aparece en las colecciones: (ICMM) Artículos
(CFMAC-IEM) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
Generic.pdf1,84 MBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 


NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.