Magnetoelectric effect in the quantum spin gap system TlCuCl3
Magnetoelectric effect in the quantum spin gap system TlCuCl3
复制标题
量子自旋间隙系统 TlCuCl3 中的磁电效应
DOI：
10.1103/physrevb.95.184420
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发表时间：
2017
影响因子：
3.7
通讯作者：
and H. Tanaka
中科院分区：
文献类型：
--
作者：
S. Kimura;K. Kakihata;Y. Sawada;K. Watanabe;M. Matsumoto;M. Hagiwara;and H. Tanaka
由于自旋算符的非对易性质，量子磁体具有强烈的量子涨落，因而引起了人们的广泛关注。本文详细研究了量子自旋能隙系统中磁振子的玻色-爱因斯坦凝聚驱动下的铁电性。量子磁体在其基态中固有的波函数的叠加在这种铁电性的出现中起着关键作用。自发极化的场依赖性清楚地表明，铁电性是由磁振子玻色-爱因斯坦凝聚体中矢量自旋手征的出现引起的。自旋二聚体中的量子纠缠能显著增强铁电性。此外，反映的各向同性性质，铁电性是非常软的，具有低的电矫顽场MV/m。我们的分析表明，矢量分量的电极化，这不是由自旋电流机制，出现在。
Quantum magnets, which involve strong quantum fluctuation stemming from noncommutative properties of spin operators, have attracted much attention because of those fascinating properties. In this paper, we report detailed behaviors of the ferroelectricity, driven by the field-induced Bose-Einstein condensation of magnon quasiparticles in the quantum spin gap system. Superposition of the wave functions inherent in a quantum magnet in its ground state plays a key role in the appearance of this ferroelectricity. The field dependence of the spontaneous electric polarization clearly demonstrates that the ferroelectricity is caused by the emergence of the vector spin chirality in the magnon Bose-Einstein condensate. The ferroelectricity is suggested to be significantly enhanced by quantum entanglement in the spin dimer. Furthermore, reflecting the isotropic nature of, the ferroelectricity is very soft with a low electric coercive fieldMV/m. Our analysis indicates that vector components of the electric polarization, which are not caused by the spin current mechanism, appear in.