Optically induced coherent intersubband excitations and spin -entangled states in semiconductor nanostructures.
dc.contributor.author | Bao, Jiming | |
dc.contributor.advisor | Merlin, Roberto | |
dc.date.accessioned | 2016-08-30T15:24:43Z | |
dc.date.available | 2016-08-30T15:24:43Z | |
dc.date.issued | 2003 | |
dc.identifier.uri | http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqm&rft_dat=xri:pqdiss:3106013 | |
dc.identifier.uri | https://hdl.handle.net/2027.42/123786 | |
dc.description.abstract | Ultrafast laser pulses and coherent techniques are used to create coherent electronic excitations and spin-entangled states in semiconductor nanostructures. A microscopic theory of impulsive stimulated Raman scattering is presented. In a modulation doped GaAs quantum well, we demonstrate the generation and control of coherent intersubband charge-density and spin-density excitations, which are the collective modes of a two-dimensional-electron-gas. The energy difference between these modes arises from Coulomb and exchange interactions. We also demonstrate the generation of coherent intersubband-inter-Landau-level excitations using similar techniques while placing the GaAs quantum well in a tilted magnetic field. In a dilute magnetic CdTe quantum well, we demonstrate the generation of spin-entangled states involving three donor electrons. The entanglement relies on the exchange interaction between optically excited holes and impurities. A model for multi-spin entanglement is presented. The entanglement is generated using circularly polarized laser pulses. Its signature is the observation of overtones of donor spin-flips in the differential reflectivity of the probe pulse. | |
dc.format.extent | 115 p. | |
dc.language | English | |
dc.language.iso | EN | |
dc.subject | Coherent | |
dc.subject | Excitations | |
dc.subject | Intersubband | |
dc.subject | Optically Induced | |
dc.subject | Semiconductor Nanostructures | |
dc.subject | Spin-entangled States | |
dc.title | Optically induced coherent intersubband excitations and spin -entangled states in semiconductor nanostructures. | |
dc.type | Thesis | |
dc.description.thesisdegreename | PhD | en_US |
dc.description.thesisdegreediscipline | Condensed matter physics | |
dc.description.thesisdegreediscipline | Optics | |
dc.description.thesisdegreediscipline | Pure Sciences | |
dc.description.thesisdegreegrantor | University of Michigan, Horace H. Rackham School of Graduate Studies | |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/123786/2/3106013.pdf | |
dc.owningcollname | Dissertations and Theses (Ph.D. and Master's) |
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