Ultrafast magneto-optical spectroscopy of (III,manganese)V ferromagnetic semiconductors

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dc.contributor.advisor Kono, Junichiro
dc.creator Wang, Jigang 2009-06-04T08:34:06Z 2009-06-04T08:34:06Z 2005
dc.description.abstract This thesis describes magneto-optical processes in ferromagnetic (III,Mn)V semiconductors and their heterostructures induced by femtosecond laser pulses. Two-color ultrafast magneto-optical spectroscopy has been developed, which allows us to observe a rich array of dynamical phenomena that are absent in traditional nonmagnetic semiconductors or metallic/insulating magnets. We isolate several distinct temporal regimes in spin dynamics, interpreting the fast (< 1 ps) dynamics as spin heating through sp-d exchange interaction between photo-carriers and Mn ions while the ∼100 ps component as a manifestation of spin-lattice relaxation. Charge carrier and phonon dynamics were also carefully studied, showing an ultrashort charge lifetime of photoinjected electrons (∼ 2 ps) and propagating coherent acoustic phonon wavepackets with strongly probe energy dependent oscillation period, amplitude and damping.
dc.format.extent 148 p.
dc.format.mimetype application/pdf
dc.language.iso eng
dc.subject Physics, Electricity and Magnetism
Physics, Condensed Matter
Physics, Optics
dc.title Ultrafast magneto-optical spectroscopy of (III,manganese)V ferromagnetic semiconductors
dc.type.genre Thesis
dc.type.material Text Physics Natural Sciences Rice University Doctoral Doctor of Philosophy
dc.identifier.citation Wang, Jigang. (2005) "Ultrafast magneto-optical spectroscopy of (III,manganese)V ferromagnetic semiconductors." Doctoral Thesis, Rice University.

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