{"id":{"repo_id":"buffalo","oai_identifier":"oai:ubir.buffalo.edu:10477/80647"},"canonical_url":"https://search.dev.ndltd.org/etd/buffalo/oai:ubir.buffalo.edu:10477/80647","repository":{"repo_id":"buffalo","name":"Buffalo","base_url":"https://ubir.buffalo.edu/oai/request"},"display":{"title":"Spin-Dependent Phenomena: From Lasers to Transition Metal Dichalcogenides","abstract":"Ph.D.","abstract_html":"Ph.D.","abstract_has_math":false,"creators":["Xu, Gaofeng"],"institution":"State University of New York at Buffalo","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Zutic, Igor","Physics"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2019,"date_issued":"2019-10-28T21:10:42Z","date_published":"2019-10-28T21:10:42Z","updated_at":"2026-07-27T19:05:23Z","subjects":["physics","theoretical physics","optics"],"languages":["eng"],"rights":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/10477/80647","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Zutic, Igor","Physics"]},{"key":"dc:creator","label":"Author","values":["Xu, Gaofeng"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2019-10-28T21:10:42Z","2019","2019-08-08 15:42:56"]},{"key":"dc:publisher","label":"Institution","values":["State University of New York at Buffalo"]},{"key":"dc:type","label":"Dc Type","values":["Text","Dissertation"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["physics","theoretical physics","optics"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/10477/80647"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Ph.D.","In this thesis, spin-dependent phenomena in lasers and transition metal dichalcogenides are investigated. Lasers with spin-polarized carriers have been demonstrated experimentally and theoretically to have improved performance compared to conventional lasers (spin-unpolarized) in both static and dynamical operation. By developing a microscopic model of spin-dependent optical gain derived from an accurate electronic structure in a quantum-well-based laser, we first study how its operation properties can be modified by spin polarization of carriers, carrier densities, and resonant cavity designs. In particular, we reveal that large birefringence(>200 GHz) can be attained by applying a strain to the active region. Subsequently, we demonstrate together with experimental collaborators that birefringence above 200 GHz is achievable in a strained spin-laser and that such a spin-laser exhibits polarization dynamics at a frequency of more than 200 GHz, which is nearly one order of magnitude greater than the intensity dynamics in state-of-the-art conventional lasers. To better understand this polarization dynamics, we generalize a common spin-flip model and simulate the performance in polarization modulation and digital data transfer, revealing a significant enhancement in the modulation bandwidth. Hence, such spin-lasers can overcome the speed limitations of conventional directly-modulated lasers and offer a prospect for the next generation of low-energy ultrafast optical communication. So far, the vast majority of spin-lasers have employed zinc-blende semiconductors such as GaAs and InAs. However, wurtzite semiconductors, in which a weak spin-orbit coupling supports simultaneous spin polarizations of electrons and holes, offer opportunities largely unexplored."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Spin-Dependent Phenomena: From Lasers to Transition Metal Dichalcogenides"]}]}],"canonical_facts":{"dc:contributor":["Zutic, Igor","Physics"],"dc:creator":["Xu, Gaofeng"],"dc:date":["2019-10-28T21:10:42Z","2019","2019-08-08 15:42:56"],"dc:description":["Ph.D.","In this thesis, spin-dependent phenomena in lasers and transition metal dichalcogenides are investigated. Lasers with spin-polarized carriers have been demonstrated experimentally and theoretically to have improved performance compared to conventional lasers (spin-unpolarized) in both static and dynamical operation. By developing a microscopic model of spin-dependent optical gain derived from an accurate electronic structure in a quantum-well-based laser, we first study how its operation properties can be modified by spin polarization of carriers, carrier densities, and resonant cavity designs. In particular, we reveal that large birefringence(>200 GHz) can be attained by applying a strain to the active region. Subsequently, we demonstrate together with experimental collaborators that birefringence above 200 GHz is achievable in a strained spin-laser and that such a spin-laser exhibits polarization dynamics at a frequency of more than 200 GHz, which is nearly one order of magnitude greater than the intensity dynamics in state-of-the-art conventional lasers. To better understand this polarization dynamics, we generalize a common spin-flip model and simulate the performance in polarization modulation and digital data transfer, revealing a significant enhancement in the modulation bandwidth. Hence, such spin-lasers can overcome the speed limitations of conventional directly-modulated lasers and offer a prospect for the next generation of low-energy ultrafast optical communication. So far, the vast majority of spin-lasers have employed zinc-blende semiconductors such as GaAs and InAs. However, wurtzite semiconductors, in which a weak spin-orbit coupling supports simultaneous spin polarizations of electrons and holes, offer opportunities largely unexplored."],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/10477/80647"],"dc:language":["eng"],"dc:publisher":["State University of New York at Buffalo"],"dc:rights":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."],"dc:subject":["physics","theoretical physics","optics"],"dc:title":["Spin-Dependent Phenomena: From Lasers to Transition Metal Dichalcogenides"],"dc:type":["Text","Dissertation"]},"updated_at":"2026-07-27T19:05:23Z"}