{"created":"2024-11-14T05:18:12.285276+00:00","id":2000685,"links":{},"metadata":{"_buckets":{"deposit":"52beacba-4cbd-491d-bb92-92ab9dde5e67"},"_deposit":{"created_by":33,"id":"2000685","owner":"33","owners":[33],"pid":{"revision_id":0,"type":"depid","value":"2000685"},"status":"published"},"_oai":{"id":"oai:oist.repo.nii.ac.jp:02000685","sets":["7:1707111347047"]},"author_link":[],"control_number":"2000685","item_10006_creator_3":{"attribute_name":"著者(英)","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Chojnacki, Leilee","creatorNameLang":"en"}]}]},"item_10006_date_granted_11":{"attribute_name":"Degree Conferral Date","attribute_value_mlt":[{"subitem_dategranted":"2024-06-30"}]},"item_10006_degree_grantor_9":{"attribute_name":"Degree Conferrral Institution","attribute_value_mlt":[{"subitem_degreegrantor":[{"subitem_degreegrantor_name":"Okinawa Institute of Science and Technology Graduate University"}],"subitem_degreegrantor_identifier":[{"subitem_degreegrantor_identifier_name":"38005","subitem_degreegrantor_identifier_scheme":"kakenhi"}]}]},"item_10006_degree_name_8":{"attribute_name":"Degree","attribute_value_mlt":[{"subitem_degreename":"Doctor of Philosophy"}]},"item_10006_description_7":{"attribute_name":"Abstract","attribute_value_mlt":[{"subitem_description":"Analogies are fundamental for human reasoning. In condensed matter, analogies with high-energy phenomenology have led to new insights, as exemplified by the Anderson Higgs mechanism, which led to the electroweak unification. Other extreme-scale phe nomena beyond the realm of experiment or observation can nevertheless be embodied by condensed matter analogues, at least in part. These analogues, such as the Hawking radiation emitted from the horizons of classical flowing fluids, can provide new avenues for empirically-driven inquiry. In this Thesis, I identify connections between two of nature’s fundamental force carrying Bosons and the Goldstone modes found in ordered phases of quantum mag nets and cold atoms. Specifically, I show how the long-wavelength spin waves in a collinear antiferromagnet—known to be massless, spin-1 excitations—correspond to pho tons. Building on this framework, I then establish that the long-wavelength excitations of a ferroquadrupolar, quantum spin-nematic are massless, spin-2 excitations, which corre spond to gravitons, i.e. quantized gravitational waves, in flat spacetime. Since quantum spin nematics can be realized in spinor condensates, I argue that these results offer an avenue for realizing a one-to-one analogue of gravitational waves in experiment. This con nection is further illustrated through simulation of a ferroquadrupolar spin-nematic phase, as realized in the spin-1 Bilinear-Biquadratic model on a triangular lattice. Working in a U(3) representation which captures both dipolar and quadrupolar degrees of freedom, I simulate both the thermodynamic and dynamical properties of this model. Within Clas sical Monte Carlo simulation, I find results consistent with a topological phase transition into the spin nematic phase, mediated by the unbinding of vortices. Using Molecular Dynamics simulations, I then elaborate on the dynamical properties of these vortices, and demonstrate how the annihilation of pairs of vortices could be used to generate analogue gravitational waves in spin nematics, suggesting a route to realization in spinor conden sates. I qualitatively extend the analogue to the profile of waves emitted by vortex pairs in the spin nematic, as compared to the characteristic profile measured by LIGO originating from binary mergers of massive objects.","subitem_description_language":"en","subitem_description_type":"Abstract"}]},"item_10006_dissertation_number_12":{"attribute_name":"Degree Referral Number","attribute_value_mlt":[{"subitem_dissertationnumber":"甲第158号"}]},"item_10006_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.15102/0002000685","subitem_identifier_reg_type":"JaLC"}]},"item_10006_rights_13":{"attribute_name":"Copyright Information","attribute_value_mlt":[{"subitem_rights":"© 2024 The Author."},{"subitem_rights":"Creative Commons Attribution-ShareAlike 4.0 International","subitem_rights_resource":"https://creativecommons.org/licenses/by-sa/4.0/"}]},"item_10006_text_24":{"attribute_name":"Exam Date","attribute_value_mlt":[{"subitem_text_value":"2024-06-04"}]},"item_10006_version_type_18":{"attribute_name":"Version Format","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_1731043371613":{"attribute_name":"","attribute_value_mlt":[{"subitem_start_page":"1"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"open access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_abf2"}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_access","date":[{"dateType":"Available","dateValue":"2024-11-14"}],"filename":"ChojnackiLeileeFulltext.pdf","filesize":[{"value":"10.9 MB"}],"format":"application/pdf","licensetype":"license_1","mimetype":"application/pdf","url":{"objectType":"fulltext","url":"https://oist.repo.nii.ac.jp/record/2000685/files/ChojnackiLeileeFulltext.pdf"},"version_id":"507a263d-39b9-4c5d-a17c-026d712ccb6e"},{"accessrole":"open_access","date":[{"dateType":"Available","dateValue":"2024-11-14"}],"filename":"ChojnackiLeileeExamAbstract.pdf","filesize":[{"value":"48 KB"}],"format":"application/pdf","mimetype":"application/pdf","url":{"objectType":"abstract","url":"https://oist.repo.nii.ac.jp/record/2000685/files/ChojnackiLeileeExamAbstract.pdf"},"version_id":"fe4f9783-4c79-486f-a9c4-42e3504c87f9"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"Condensed matter physics | foundations of quantum magnetism | fundamentals of electromagnetism and gravity","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"doctoral thesis","resourceuri":"http://purl.org/coar/resource_type/c_db06"}]},"item_title":"量子磁性体の集団励起における光と重力の類似性","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"量子磁性体の集団励起における光と重力の類似性","subitem_title_language":"ja"},{"subitem_title":"Analogues of Light and Gravity in the Collective Excitations of Quantum Magnets and Cold Atoms","subitem_title_language":"en"}]},"item_type_id":"10006","owner":"33","path":["1707111347047"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2024-11-14"},"publish_date":"2024-11-14","publish_status":"0","recid":"2000685","relation_version_is_last":true,"title":["量子磁性体の集団励起における光と重力の類似性"],"weko_creator_id":"33","weko_shared_id":-1},"updated":"2024-11-26T07:42:16.689869+00:00"}