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首页> 外文期刊>Physical review >Magnetocaloric effects, quantum critical points, and the Berezinsky-Kosterlitz-Thouless transition in two-dimensional coupled spin-dimer systems
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Magnetocaloric effects, quantum critical points, and the Berezinsky-Kosterlitz-Thouless transition in two-dimensional coupled spin-dimer systems

机译：二维耦合自旋二聚体系统中的磁热效应，量子临界点和Berezinsky-Kosterlitz-Thouless跃迁

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摘要

Spin-dimer systems are a versatile playground for the detailed study of quantum phase transitions. Using the magnetic field as the tuning parameter, it is possible to observe a crossover from the characteristic scaling near critical points to the behavior of a finite-temperature phase transition. In this work we study two-dimensional coupled spin-dimer systems by comparing numerical quantum Monte Carlo simulations with analytical calculations of the susceptibility, the magnetocaloric effect, and the helicity modulus. The magnetocaloric behavior of the magnetization with temperature can be used to determine the critical fields with high accuracy, but the critical scaling does not show the expected logarithmic corrections. The zeros of the cooling rate are an excellent indicator of the competition between quantum criticality and vortex physics, but they are not directly associated with the quantum phase transition or the finite-temperature Berezinsky-Kosterlitz-Thouless transition. The results give a unified picture of the full quantum and finite-temperature phase diagram.
机译：自旋二聚体系统是用于量子相变详细研究的多功能场所。使用磁场作为调整参数，可以观察到从临界点附近的特性缩放到有限温度相变行为的过渡。在这项工作中，我们通过比较数值量子蒙特卡洛模拟与磁化率，磁热效应和螺旋模量的解析计算，研究了二维耦合自旋二聚体系统。磁化随温度的磁热行为可用于高精度确定临界场，但临界比例未显示预期的对数校正。冷却速率的零是量子临界性和旋涡物理之间竞争的一个很好的指标，但是它们与量子相变或有限温度的别列斯基-科斯特利茨-舒勒跃迁没有直接关系。结果给出了完整的量子和有限温度相图的统一图。

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