{"created":"2023-05-15T14:48:36.394886+00:00","id":66590,"links":{},"metadata":{"_buckets":{"deposit":"fd359666-0747-4ac8-9854-bb263c9303e8"},"_deposit":{"created_by":1,"id":"66590","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"66590"},"status":"published"},"_oai":{"id":"oai:repo.qst.go.jp:00066590","sets":["10:29"]},"author_link":["770794","770793"],"item_10005_date_7":{"attribute_name":"発表年月日","attribute_value_mlt":[{"subitem_date_issued_datetime":"2017-11-08","subitem_date_issued_type":"Issued"}]},"item_10005_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"The S=1/2 kagome-lattice antiferromagnet is one of interesting frustrated quantum spin systems. The system is supposed to exhibit the quantum spin liquid in the ground state, which was proposed as a possible origin of the high-temprature superconductivity. The spin gap is an important physical quantity to characterize the spin liquid behavior. Whether the S=1/2 kagome-lattice antiferromagnet is gapless or has a finite spin gap, is still an unsolved issue. Because any recently developped numerical calculation methods are not enough to determine it in the thermodynamic limit. Our large-scale numerical diazonalization up to 42-spin clusters and a finite-size scaling analysis indicated that the S=1/2 kagome-lattice antiferromagnet is gapless in the thremodynamic limit[1]. It is consistent with the U(1) Dirac spin liquid theory of the kagome-lattice antiferromagnet[2,3]. On the other hand, some density matrix renormalization group (DMRG) calculations supported the gapped Z2 topological spin liquid theory[4,5]. Our recent numerical diagonalization analysis on the magnetization process of a distorted kagome-lattice antiferromagnet indicated that the perfect kagome-lattice system is just on a quantum critical point[6]. It would be a possible reason why it is difficult to determine whether the perfect kagome-lattice antiferromagnet is gapless or gapped. \n     In the present study, a field derivative analysis is applied for the spin gap issue of the kagome-lattice antiferromanget, using the numerical diagonalization data up to 42-spin clusters. It is consistent with our previous conclusion that it is gapless[7]. \n\n[1]H. Nakano and T. Sakai: J. Phys. Soc. Jpn. 80 (2011) 053704.\n[2]Y. Ran, M. Hermele, P. A. Lee and X. -G. Wen: Phys. Rev. Lett. 98 (2007) 117205.\n[3]Y. Iqbal, F. Becca, S. Sorella and D. Poilblanc: Phys. Rev. B 87 (2013) 060405(R).\n[4]S. Yan, D. A. Huse and S. R. White: Science 332 (2011) 1173.\n[5]S. Nishimoto, N. Shibata and C. Hotta: Nat. Commun. 4 (2013) 2287.\n[6]H. Nakano and T. Sakai: J. Phys. Soc. Jpn. 83 (2014) 104710.\n[7]H. Nakano and T. Sakai: in preparation. \n","subitem_description_type":"Abstract"}]},"item_10005_description_6":{"attribute_name":"会議概要（会議名, 開催地, 会期, 主催者等）","attribute_value_mlt":[{"subitem_description":"Symposium on Trends in Condensed Matter Physics","subitem_description_type":"Other"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"metadata only access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_14cb"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Sakai, T."}],"nameIdentifiers":[{"nameIdentifier":"770793","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Sakai, Toru","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"770794","nameIdentifierScheme":"WEKO"}]}]},"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":"conference object","resourceuri":"http://purl.org/coar/resource_type/c_c94f"}]},"item_title":"Quantum Spin Liquid of Kagome-Lattice Antiferromagnet","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Quantum Spin Liquid of Kagome-Lattice Antiferromagnet"}]},"item_type_id":"10005","owner":"1","path":["29"],"pubdate":{"attribute_name":"公開日","attribute_value":"2018-01-13"},"publish_date":"2018-01-13","publish_status":"0","recid":"66590","relation_version_is_last":true,"title":["Quantum Spin Liquid of Kagome-Lattice Antiferromagnet"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-05-16T00:28:49.805002+00:00"}