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approvedsummary.pdf2015-04-08 12:33:33Reinaldo Zapata


Author: Reinaldo A Zapata
Requested Type: Poster
Submitted: 2015-03-12 14:33:27

Co-authors: Bernardo S. Mendoza, Sean M. Anderson

Contact Info:
Centro de Investigaciones en Optica, AC
Loma del Bosque 115, Lomas del
Leon, Guanajuato   37150

Abstract Text:
We present a theoretical study of optical spin-injection in graphane, or hydrogenated graphene structures. In this process, spin-polarized electrons are injected into the conduction bands in semiconductors through the absorption of circularly polarized light. We describe five structures with 12.5%, 50%, and 100% hydrogenation with two different spatial configurations for the latter two cases. The hydrogen atoms in each case modify the carbon-carbon bonds, changing the optical properties and producing a discernible band gap. We calculate the degree of spin polarization (DSP) using quantum mechanical first principle methods such as DFT-LDA and the GW correction. Our results indicate that these structures are favorable for inducing DSP, particularly one of the 50% H structures which can theoretically achieve 100% DSP. This is a promising result with a wide range of possible applications in the field of spintronics.