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O(3) nonlinear sigma model in 1+1 dimensions with matrix product states

机译:具有矩阵乘积状态的1 + 1维O(3)非线性sigma模型

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We numerically study the spectral properties, the entanglement and the zero-temperature phase structure at nonvanishing chemical potential of the O(3) nonlinear sigma model. Using matrix product states, a particular kind of one-dimensional tensor network state, we show that we are able to reach the asymptotic scaling regime and to reproduce the analytical predictions for the mass gap at vanishing chemical potential. In addition, we study the scaling of the entanglement entropy towards the continuum limit obtaining a central charge consistent with 2. Moreover, our approach does not suffer from the sign problem and we also explore the phase structure of the model for nonzero chemical potential and map out the location of the transitions between different charge sectors with high precision.
机译:我们数值研究光谱性质,纠缠和零温度相结构在化学势不消失的O(3)非线性sigma模型中。使用矩阵乘积状态(一种特殊的一维张量网络状态),我们表明我们能够达到渐近的标度状态,并能够在化学势消失时重现质量缺口的分析预测。此外,我们研究了纠缠熵向连续极限的标度,获得了与2一致的中心电荷。此外,我们的方法没有遭受符号问题的困扰,并且还探索了非零化学势模型的相结构并绘制了图高精度地找出不同电荷扇区之间的过渡位置。

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