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approvednarzate_abstract_osi11.pdf2015-03-27 13:56:43Norberto Arzate

Abstracts

Author: Norberto Arzate
Requested Type: Poster
Submitted: 2015-03-13 09:20:22

Co-authors: R.A. Vázquez-Nava, Z. Ibarra-Borja, M.I. Álvarez-Nuñez and B.S. Mendoza

Contact Info:
Centro de Investigaciones en Óptica
Loma del Bosque 115, Lomas del
León, Guanajuato   37150
Mexico

Abstract Text:
We present a theoretical study of the optical generation of one-photon spin and current injection onto In-adsorbed Si(111) surfaces as well as MoS2 monolayer. The spin injection, under incidence of circularly polarized light into nonmagnetic semiconductors, creates spin-polarized electrons in the conduction bands. Meanwhile, the current injection is a nonlinear second-order effect that is allowed in materials without inversion symmetry. In bulk centrosymmetric crystals, the optical injection of current can only be observed at the surface wherein the inversion of symmetry might be broken. We present calculations for the degree of spin polarization and current-injection spectra which are calculated in a full electronic band structure scheme at the level of GW scissor-energy correction. In particular, we focus in the In-adsorbed Si(111) surfaces having 4 x 2 and 8 x 2 reconstructions, and the MoS2 monolayer. Our results show an anisotropic behavior of the spin- and current-injection optical response and that it is possible to optically generate injection current coming mainly from the first two top layers on In-adsorbed surface reconstructions.

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