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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/733078975c02f-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× Nakano, Hiroki× 坂井 徹 |
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| 抄録 | ||||||
| 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 | |||||
