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理论物理通讯：英文版

Quantum Phase Transitions and Dimerized Phases in Frustrated Spin Ladder

文瑞, 刘光华, 田光善

Published Jan 1, 2011• 0 citations
OpenAlex

Abstract

在这份报纸，我们由使用 bosonization 技术和密度矩阵重正常化组(DMRG ) 学习一个挫败的旋转梯子模型的阶段图算法。intra 链 next-nearestneighbor (NNN ) 的效果超交换相互作用详细被调查，顺序参数是打算的检测使聚合成二聚物的阶段的出现。我们发现 intra 链 NNN 相互作用在导致使聚合成二聚物的阶段起一个关键作用。

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在这篇文章，我们在二维的强烈相关的费米子系统在量阶段转变上考察我们的最近的工作。我们由用细胞的动态吝啬地的理论(CDMFT ) 和连续时间的量蒙特卡罗算法的联合计算状态，两倍占有，和费密表面进化的密度讨论这些系统的 metalinsulator 转变性质。而且，我们由定义磁性的顺序参数探索每个状态的磁性。包括 antiferromagnetic 金属，顺磁的金属， Kondo 金属，和铁磁性的绝缘体，有许多吸引人的量状态的富有的阶段图被作出对有利的裁决有强烈相关的费米子的二维的格子。我们相信我们的结果将导致真实材料的性质的更好的理解。

物理学前沿：英文版•Jan 1, 2015•0 citations
在这份报纸，我们由使用 bosonization 技术和密度矩阵重正常化组(DMRG ) 学习一个挫败的旋转梯子模型的阶段图算法。intra 链 next-nearestneighbor (NNN ) 的效果超交换相互作用详细被调查，顺序参数是打算的检测使聚合成二聚物的阶段的出现。我们发现 intra 链 NNN 相互作用在导致使聚合成二聚物的阶段起一个关键作用。
We investigate a spin-1/21/21/2 two-leg honeycomb ladder with frustrating next-nearest-neighbor (NNN) coupling along the legs, which is equivalent to two ${J}_{1}\text{\ensuremath{-}}{J}_{2}$ spin chains coupled with ${J}_{\ensuremath{\perp}}$ at odd rungs. The full parameter region of the model is systematically studied using conventional and infinite density-matrix renormalization group as well as bosonization. The rich phase diagram consists of five distinct phases: a Haldane phase, a NNN-Haldane phase, and a staggered dimer phase when ${J}_{\ensuremath{\perp}}<0$; a rung singlet phase and a columnar dimer phase when ${J}_{\ensuremath{\perp}}>0$. An interesting reentrant behavior from the dimerized phase into the Haldane phase is found as the frustration J2{J}_{2}J2​ increases. The universalities of the critical phase transitions are fully analyzed. Phase transitions between dimerized and disordered phases belong to the two-dimensional Ising class with a central charge c=1/2c=1/2c=1/2. The transition from the Haldane phase to NNN-Haldane phase is of a weak topological first order, while the continuous transition between the Haldane phase and rung singlet phase has a central charge c=2c=2c=2.
在这篇文章，我们在二维的强烈相关的费米子系统在量阶段转变上考察我们的最近的工作。我们由用细胞的动态吝啬地的理论(CDMFT ) 和连续时间的量蒙特卡罗算法的联合计算状态，两倍占有，和费密表面进化的密度讨论这些系统的 metalinsulator 转变性质。而且，我们由定义磁性的顺序参数探索每个状态的磁性。包括 antiferromagnetic 金属，顺磁的金属， Kondo 金属，和铁磁性的绝缘体，有许多吸引人的量状态的富有的阶段图被作出对有利的裁决有强烈相关的费米子的二维的格子。我们相信我们的结果将导致真实材料的性质的更好的理解。