期刊
PHYSICAL REVIEW B
卷 102, 期 8, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.102.081112
关键词
-
资金
- DFG through the Emmy Noether program [JA2306/4-1, 411750675, SFB 1143, 247310070, EXC 2147, 390858490]
- DFG through Wurzburg-Dresden Cluster of Excellence ct.qmat [EXC 2147, 390858490]
We study a model for a quantum critical point in two spatial dimensions between a semimetallic phase, characterized by a stable quadratic Fermi node, and an ordered phase, in which the spectrum develops a band gap. The quantum critical behavior can be computed exactly, and we explicitly derive the scaling laws of various observables. While the order-parameter correlation function at criticality satisfies the usual power law with anomalous exponent eta(phi) = 2, the correlation length and the expectation value of the order parameter exhibit essential singularities upon approaching the quantum critical point from the insulating side, akin to the Berezinskii-Kosterlitz-Thouless transition. The susceptibility, on the other hand, has a power-law divergence with non-mean-field exponent gamma = 2. On the semimetallic side, the correlation length remains infinite, leading to an emergent scale invariance throughout this phase.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据