Quantum Fluctuations of Chirality in One-Dimensional Spin-1/2 Multiferroics: Gapless Dielectric Response from Phasons and Chiral Solitons
Quantum Fluctuations of Chirality in One-Dimensional Spin-1/2 Multiferroics: Gapless Dielectric Response from Phasons and Chiral Solitons
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DOI：
10.1143/jpsj.77.123712
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发表时间：
2008-12-01
影响因子：
1.7
通讯作者：
Onoda, Shigeki
中科院分区：
文献类型：
--
作者：
Furukawa, Shunsuke;Sato, Masahiro;Onoda, Shigeki
本文提出了一个一维自旋1/2多铁性的量子理论，其中矢量自旋手征与电极化耦合。基于精确对角化和玻色化，结果表明，量子涨落明显降低手征有序振幅和相关的铁电极化。这产生了近共线的自旋相关在短程尺度，在定性协议与最近的中子散射实验。实验中出现了由相子和新孤子描述的无带隙手征激发，这一点可以从低能介电响应中得到实验验证。
We present a quantum theory for one-dimensional spin-1/2 multiferroics, where the vector spin chirality couples with the electric polarization. Based on exact diagonalization and bosonization, it is shown that quantum fluctuations appreciably reduce the chiral ordering amplitude and the associated ferroelectric polarization. This yields nearly collinear spin correlations in short-range scales, in qualitative agreement with recent neutron scattering experiments. There appear gapless chirality excitations described by phasons and new solitons, which can be experimentally verified from the low-energy dielectric response.