Chirality in spin- 1/2 zigzag XY chain : Low-temperature density-matrix renormalization group study
Chirality in spin- 1/2 zigzag XY chain : Low-temperature density-matrix renormalization group study
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自旋 1/2 锯齿形 XY 链中的手性：低温密度矩阵重正化群研究
DOI：
10.1103/physrevb.82.035437
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
T. Tohyama
中科院分区：
文献类型：
--
作者：
T. Sugimoto;S. Sota;T. Tohyama
用低温密度矩阵重整化群方法研究了自旋为12的锯齿链在低温下的自旋手性。我们计算了手性的动态关联和静态关联与温度的关系。在手性相中，零温下的手性长程有序在有限温度下消失，这与短程相互作用的一维体系在有限温度下不存在长程有序的事实一致。在手性相旁边的二聚体中，我们发现随着温度的升高，静态手性关联和自旋关联都得到了增强。这种增强对应于动态手征关联函数中带隙内光谱权重的增加。这种由温度引起的手征关联证明了激发态中手征态的存在。
We study spin chirality for a spin- 12 zigzagchain at low temperature by applying a low-temperature density-matrix renormalization group technique. We calculate temperature dependence of dynamical and static correlations of the chirality. In a chiral phase, chiral long-range order at zero temperature disappears at finite temperature, consistent with the fact that there is no long-range order at finite temperature in one-dimensional systems with short-range interactions. In a dimer phase next to the chiral phase, we find an enhancement of static chiral correlation as well as spin correlation with increasing temperature. The enhancement corresponds to the increase in spectral weight inside a gap in the dynamical chiral-correlation function. This temperature-induced chiral correlation is a demonstration of the presence of a chiral state in excited states.