Universal Critical Temperature for Kosterlitz-Thouless Transitions in Bilayer Quantum Magnets
Universal Critical Temperature for Kosterlitz-Thouless Transitions in Bilayer Quantum Magnets
复制标题
双层量子磁体中 Kosterlitz-Thouless 转变的通用临界温度
DOI：
10.1103/physrevlett.81.5418
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发表时间：
1998
影响因子：
8.6
通讯作者：
S. Sachdev
中科院分区：
文献类型：
--
作者：
M. Troyer;S. Sachdev
Recent experiments show that double layer quantum Hall systems may have a ground state with canted antiferromagnetic order. In the vicinity of a quantum critical point, the order vanishes at a temperature ${T}_{\mathrm{KT}}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}\ensuremath{\kappa}H$, where $H$ is the magnetic field and $\ensuremath{\kappa}$ is a universal number. We present quantum Monte Carlo simulations on a model spin system which support the universality of $\ensuremath{\kappa}$ and determine its value. This allows experimental tests of an intrinsically quantum-mechanical universal quantity, which is not also a property of a higher dimensional classical critical point.
Recent experiments show that double layer quantum Hall systems may have a ground state with canted antiferromagnetic order. In the vicinity of a quantum critical point, the order vanishes at a temperature ${T}_{\mathrm{KT}}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}\ensuremath{\kappa}H$, where $H$ is the magnetic field and $\ensuremath{\kappa}$ is a universal number. We present quantum Monte Carlo simulations on a model spin system which support the universality of $\ensuremath{\kappa}$ and determine its value. This allows experimental tests of an intrinsically quantum-mechanical universal quantity, which is not also a property of a higher dimensional classical critical point.