{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/129598"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/129598","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Nonlinear THz emission spectroscopy of spin and charge dynamics in correlated materials","abstract":"Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-05-01","abstract_html":"Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-05-01","abstract_has_math":false,"creators":["Lu, Yinchuan"],"institution":"University of Illinois Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Mahmood, Fahad","Bradlyn, Barry","Hoffmann, Axel","Wang, Pengjie"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2025,"date_issued":"2025-04-30","date_published":"2025-04-30","updated_at":"2026-07-22T22:25:05Z","subjects":["Spectroscopy","Terahertz","Correlated Materials","Magnetic materials","Ultrafast optics","Condensed matter physics"],"languages":["en","eng"],"rights":["Copyright 2025 Yinchuan Lu"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/2142/129598","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Mahmood, Fahad","Bradlyn, Barry","Hoffmann, Axel","Wang, Pengjie"]},{"key":"dc:creator","label":"Author","values":["Lu, Yinchuan"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2025-04-30","2025-05"]},{"key":"dc:type","label":"Dc Type","values":["text","Thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Physics"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Spectroscopy","Terahertz","Correlated Materials","Magnetic materials","Ultrafast optics","Condensed matter physics"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en","eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2025 Yinchuan Lu"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://hdl.handle.net/2142/129598"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-05-01","The student, Yinchuan Lu, accepted the attached license on 2025-04-28 at 17:09.","The student, Yinchuan Lu, submitted this Dissertation for approval on 2025-04-28 at 17:17.","This Dissertation was approved for publication on 2025-04-30 at 16:55.","DSpace SAF Submission Ingestion Package generated from Vireo submission #22049 on 2025-10-19 at 19:16:35","Understanding the intrinsic properties of materials is of fundamental importance to both scientific and technological advancements. The ability to characterize their electronic and optical behavior on the sub-picosecond timescale advances our understanding of the non-equilibrium physics and enables the development of next-generation applications in opto-electronis, spintronics and phase-change materials. This thesis is dedicated to investigate the charge and spin dynamics of correlated material systems upon optical illumination, with a special focus on their response in the terahertz (THz) frequency range. In this study, we examine FeRh, CrGeTe3, and Bi2Te3, which are materials of significant interest due to their unique electronic and magnetic properties. FeRh, known for its first-order metamagnetic phase transition, offers potential applications in heat-assisted magnetic recording. CrGeTe3, a layered ferromagnetic semiconductor, provides insights into two-dimensional magnetism and its potential in the ultimate dense storage platform. Bi2Te3, a well-known topological insulator, serves as a model system for studying topologically protected surface states and future error-tolerance quantum computing devices. To analyze these materials, we employ THz time-domain spectroscopy (TTDS), a technique that allows direct measurement of their complex optical response. By capturing both the amplitude and phase of THz waves, TTDS enables precise determination of essential parameters such as optical conductivity, refractive index, and carrier dynamics. This approach provides a powerful framework for probing phase transitions, charge transport mechanisms, and magnetic interactions in these systems. While the focus of this thesis remains on material properties, the methodological advancements in THz spectroscopy play a crucial role in unveiling the underlying physics of these complex systems. By bridging experimental techniques with condensed matter research, this work contributes to the growing field of THz spectroscopy in quantum materials. I extend my deepest gratitude to my advisors and colleagues who have guided and supported this research. I hope that the insights presented in this work will inspire further exploration into the fascinating properties of these novel materials."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Nonlinear THz emission spectroscopy of spin and charge dynamics in correlated materials"]}]}],"canonical_facts":{"dc:contributor":["Mahmood, Fahad","Bradlyn, Barry","Hoffmann, Axel","Wang, Pengjie"],"dc:creator":["Lu, Yinchuan"],"dc:date":["2025-04-30","2025-05"],"dc:description":["Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-05-01","The student, Yinchuan Lu, accepted the attached license on 2025-04-28 at 17:09.","The student, Yinchuan Lu, submitted this Dissertation for approval on 2025-04-28 at 17:17.","This Dissertation was approved for publication on 2025-04-30 at 16:55.","DSpace SAF Submission Ingestion Package generated from Vireo submission #22049 on 2025-10-19 at 19:16:35","Understanding the intrinsic properties of materials is of fundamental importance to both scientific and technological advancements. The ability to characterize their electronic and optical behavior on the sub-picosecond timescale advances our understanding of the non-equilibrium physics and enables the development of next-generation applications in opto-electronis, spintronics and phase-change materials. This thesis is dedicated to investigate the charge and spin dynamics of correlated material systems upon optical illumination, with a special focus on their response in the terahertz (THz) frequency range. In this study, we examine FeRh, CrGeTe3, and Bi2Te3, which are materials of significant interest due to their unique electronic and magnetic properties. FeRh, known for its first-order metamagnetic phase transition, offers potential applications in heat-assisted magnetic recording. CrGeTe3, a layered ferromagnetic semiconductor, provides insights into two-dimensional magnetism and its potential in the ultimate dense storage platform. Bi2Te3, a well-known topological insulator, serves as a model system for studying topologically protected surface states and future error-tolerance quantum computing devices. To analyze these materials, we employ THz time-domain spectroscopy (TTDS), a technique that allows direct measurement of their complex optical response. By capturing both the amplitude and phase of THz waves, TTDS enables precise determination of essential parameters such as optical conductivity, refractive index, and carrier dynamics. This approach provides a powerful framework for probing phase transitions, charge transport mechanisms, and magnetic interactions in these systems. While the focus of this thesis remains on material properties, the methodological advancements in THz spectroscopy play a crucial role in unveiling the underlying physics of these complex systems. By bridging experimental techniques with condensed matter research, this work contributes to the growing field of THz spectroscopy in quantum materials. I extend my deepest gratitude to my advisors and colleagues who have guided and supported this research. I hope that the insights presented in this work will inspire further exploration into the fascinating properties of these novel materials."],"dc:format":["application/pdf"],"dc:identifier":["https://hdl.handle.net/2142/129598"],"dc:language":["en","eng"],"dc:rights":["Copyright 2025 Yinchuan Lu"],"dc:subject":["Spectroscopy","Terahertz","Correlated Materials","Magnetic materials","Ultrafast optics","Condensed matter physics"],"dc:title":["Nonlinear THz emission spectroscopy of spin and charge dynamics in correlated materials"],"dc:type":["text","Thesis"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:05Z"}