Damle Kedar, Huse David A
Physics Department, Harvard University, Cambridge, MA 02138, USA.
Phys Rev Lett. 2002 Dec 30;89(27):277203. doi: 10.1103/PhysRevLett.89.277203. Epub 2002 Dec 20.
We present a general theory of a class of multicritical points in the phase diagrams of random antiferromagnetic spin chains. We show that low-energy properties of these points are almost completely determined by a permutation symmetry of the effective theory not shared by the microscopic Hamiltonian. One case provides an analytic theory of the quantum critical point in the random spin-3/2 chain, studied in a recent work by Refael, Kehrein, and Fisher.
我们提出了一类随机反铁磁自旋链相图中多临界点的通用理论。我们表明，这些点的低能性质几乎完全由有效理论的置换对称性决定，而微观哈密顿量并不具有这种对称性。其中一个案例给出了随机自旋 - 3/2链中量子临界点的解析理论，这是Refael、Kehrein和Fisher在最近的一项工作中所研究的。
