The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 04, 2003
Filed:
Mar. 22, 2002
Ravi D. R. Bhat, Toronto, CA (US);
John Edward Sipe, Toronto, CA;
Henry Martin Van Driel, Mississauga, CA;
Other;
Abstract
The present invention uses quantum interference of one and two photon absorption from a multiple color fields to optically inject ballistic spin currents in unbiased photoconductors. The spin currents can be generated with and without an accompanying electrical current and can be controlled using the relative phase of the colors. In one aspect of the there is provided a method of generating spin currents in a photoconductor material comprising producing a first coherent light beam having a first frequency &ohgr; and a second coherent light beam having a frequency twice the first frequency 2&ohgr; , polarizing the first and second coherent light beams to have a preselected polarization with respect to each other, and simultaneously irradiating a selected region of the photoconductor material with the first coherent light beam and the second coherent light beam to generate a spin current in the photoconductor. When the photoconductor has a noncentrosymmetric zincblende (T symmetry) crystal structure a single coherent light beam can be used to obtain pure spin currents and mixed electrical and spin, currents may be produced when the photoconductor has a wurtzite structure.