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Quantum spin fluid behaviors of the kagome- and triangular-lattice antiferromagnets

https://repo.qst.go.jp/records/73307
https://repo.qst.go.jp/records/73307
8975c02f-a7b0-43e9-8671-26d6d0a9049a
Item type 会議発表用資料 / Presentation(1)
公開日 2018-01-13
タイトル
タイトル Quantum spin fluid behaviors of the kagome- and triangular-lattice antiferromagnets
言語
言語 eng
資源タイプ
資源タイプ識別子 http://purl.org/coar/resource_type/c_c94f
資源タイプ conference object
アクセス権
アクセス権 metadata only access
アクセス権URI http://purl.org/coar/access_right/c_14cb
著者 Sakai, Toru

× Sakai, Toru

WEKO 722297

Sakai, Toru

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Nakano, Hiroki

× Nakano, Hiroki

WEKO 722298

Nakano, Hiroki

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坂井 徹

× 坂井 徹

WEKO 722299

en 坂井 徹

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内容記述タイプ Abstract
内容記述 The S=1/2 kagome-lattice antiferromagnet is one of interesting frustrated quantum spin systems. The systems exhibit the quantum spin fluid behavior, which was proposed as an origin of the high-Tc superconductivity. The spin gap is an important physical quantity to characterize the spin fluid behavior. Whether the S=1/2 kagome-lattice antiferromagnet is gapless or has a finite spin gap, is still 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[1-3]. It is consistent with the U(1) Dirac spin liquid theory of the kagome-lattice antiferromagnet[4,5]. On the other hand, the density matrix renormalization group calculations supported the gapped Z2 topological spin liquid theory[6,7]. We propose one of better methods to determine whether the spin excitation is gapless or gapped, based on the finite-size scaling analysis of the spin susceptibility calculated by the numerical diagonalization. The present work indicates that the kagome-lattice antiferromagnet is gapless, as well as the triangular-lattice one.
会議概要(会議名, 開催地, 会期, 主催者等)
内容記述タイプ Other
内容記述 28th International Conference on Low-Temperature Physics (LT28)
発表年月日
日付 2017-08-14
日付タイプ Issued
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