{"680135":{"#nid":"680135","#data":{"type":"event","title":"Special Condensed Matter Seminar","body":[{"value":"\u003Cp\u003E\u003Cstrong\u003ETitle\u003C\/strong\u003E\u003Cem\u003E\u003Cstrong\u003E:\u003C\/strong\u003E\u003C\/em\u003E\u0026nbsp;\u003Cstrong\u003ELeveraging Thermal Fluctuations to Investigate the Spin Dynamics of Quantum Magnets\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ETime\u003C\/strong\u003E: Friday, February 7, 2025 2:30pm - 3:30pm\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ELocation\u003C\/strong\u003E: Howey Building Room C204\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EHost\u003C\/strong\u003E: School of Physic Associate Prof. Martin Mourigal\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ESpeaker\u003C\/strong\u003E\u003Cem\u003E\u003Cstrong\u003E:\u003C\/strong\u003E\u0026nbsp;\u003C\/em\u003E\u003Ca href=\u0022https:\/\/scholar.google.co.kr\/citations?user=98RMqKIAAAAJ\u0026amp;hl=ko\u0022 rel=\u0022noopener noreferrer\u0022 target=\u0022_blank\u0022 title=\u0022https:\/\/scholar.google.co.kr\/citations?user=98RMqKIAAAAJ\u0026amp;hl=ko\u0022\u003E\u003Cstrong\u003EDr. Pyeongjae Park\u003C\/strong\u003E\u003C\/a\u003E\u003Cstrong\u003E,\u0026nbsp;\u003C\/strong\u003EMaterials Science and Technology Division, Oak Ridge National Laboratory\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u003Cem\u003E\u003Cstrong\u003EAbstract:\u003C\/strong\u003E\u0026nbsp;\u003C\/em\u003ELow-dimensional or frustrated quantum (\u003Cem\u003ES\u003C\/em\u003E\u0026nbsp;= 1\/2) magnets exhibit strong quantum spin fluctuations, leading to complex spin dynamics that challenge conventional spin-wave analysis and complicate the identification of microscopic spin models using neutron scattering. However, raising the temperature moves these systems into a regime dominated by classical thermal fluctuations, making their dynamical properties more amenable to semi-classical analysis. In this talk, I introduce an approach that leverages thermal fluctuations to study the momentum and energy-resolved spin dynamics of quantum magnets, using the Landau-Lifshitz dynamics (LLD) framework implemented in the Su(n)ny software package [1]. I will outline a standardized simulation protocol designed for modelling finite-temperature spin dynamics [2, 3] and present its successful application to the inelastic neutron scattering results of two model systems: the\u0026nbsp;\u003Cem\u003ES\u003C\/em\u003E\u0026nbsp;= 1\/2 square lattice Heisenberg antiferromagnet Zn\u003Cem\u003E2\u003C\/em\u003EVO(PO\u003Cem\u003E4\u003C\/em\u003E)\u003Cem\u003E2\u003C\/em\u003E\u0026nbsp;[2] and the\u0026nbsp;\u003Cem\u003ES\u003C\/em\u003E\u0026nbsp;= 1\/2 XXZ triangular lattice antiferromagnet\u0026nbsp;Ba\u003Cem\u003E2\u003C\/em\u003ELa\u003Cem\u003E2\u003C\/em\u003ECoTe\u003Cem\u003E2\u003C\/em\u003EO\u003Cem\u003E12\u003C\/em\u003E[4]. Notably, this approach has successfully determined spin Hamiltonians by fitting energy-resolved excitation spectra in the paramagnetic phase while also capturing the attenuation of quantum spin dynamics\u2013such as continuum excitations\u2013due to thermal fluctuations. I will conclude by discussing the broad potential of this LLD-based approach for advancing research in quantum magnetism.\u003C\/p\u003E","summary":"","format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003EDr. Pyeongjae Park, Materials Science \u0026amp; Technology at Oakridge National Laboratory \u0026nbsp;will speak on Leveraging Thermal Fluctuations to Investigate Spin Dynamics of Quantum Magnets.\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ETime\u003C\/strong\u003E: Friday, February 7, 2025 2:30pm - 3:30pm\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ELocation\u003C\/strong\u003E: Howey Building Room C204\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EHost\u003C\/strong\u003E: School of Physic Associate Prof. Martin Mourigal\u003C\/p\u003E","format":"limited_html"}],"field_summary_sentence":[{"value":"Leveraging Thermal Fluctuations to Investigate Spin Dynamics of Quantum Magnets"}],"uid":"36626","created_gmt":"2025-02-03 16:03:53","changed_gmt":"2025-02-03 19:46:05","author":"awilliams675","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2025-02-07T14:30:00-05:00","event_time_end":"2025-02-07T15:30:00-05:00","event_time_end_last":"2025-02-07T15:30:00-05:00","gmt_time_start":"2025-02-07 19:30:00","gmt_time_end":"2025-02-07 20:30:00","gmt_time_end_last":"2025-02-07 20:30:00","rrule":null,"timezone":"America\/New_York"},"location":"Howey Physics Building C204","extras":[],"hg_media":{"676189":{"id":"676189","type":"image","title":"Special Seminar Dr. Pyeongjae Park ONL 2-7-25 .jpg","body":null,"created":"1738605414","gmt_created":"2025-02-03 17:56:54","changed":"1738605414","gmt_changed":"2025-02-03 17:56:54","alt":"Condensed Matter Seminar with Dr. Pyeongjae Park of Oakridge National Laboratory","file":{"fid":"259924","name":"Special Seminar Dr. Pyeongjae Park ONL 2-7-25 .jpg","image_path":"\/sites\/default\/files\/2025\/02\/03\/Special%20Seminar%20Dr.%20Pyeongjae%20Park%20ONL%202-7-25%20.jpg","image_full_path":"http:\/\/hg.gatech.edu\/\/sites\/default\/files\/2025\/02\/03\/Special%20Seminar%20Dr.%20Pyeongjae%20Park%20ONL%202-7-25%20.jpg","mime":"image\/jpeg","size":124720,"path_740":"http:\/\/hg.gatech.edu\/sites\/default\/files\/styles\/740xx_scale\/public\/2025\/02\/03\/Special%20Seminar%20Dr.%20Pyeongjae%20Park%20ONL%202-7-25%20.jpg?itok=PisxuJIl"}}},"media_ids":["676189"],"groups":[{"id":"126011","name":"School of Physics"}],"categories":[],"keywords":[],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1795","name":"Seminar\/Lecture\/Colloquium"}],"invited_audience":[{"id":"78761","name":"Faculty\/Staff"},{"id":"177814","name":"Postdoc"},{"id":"174045","name":"Graduate students"},{"id":"78751","name":"Undergraduate students"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}