Vojta Thomas, Schmalian Jörg
Department of Physics, University of Missouri-Rolla, Rolla, Missouri 65409, USA.
Phys Rev Lett. 2005 Dec 2;95(23):237206. doi: 10.1103/PhysRevLett.95.237206. Epub 2005 Nov 29.
We show that the interplay of geometric criticality and quantum fluctuations leads to a novel universality class for the percolation quantum phase transition in diluted magnets. All critical exponents involving dynamical correlations are different from the classical percolation values, but in two dimensions they can nonetheless be determined exactly. We develop a complete scaling theory of this transition, and we relate it to recent experiments in La2Cu(1-p)(Zn,Mg)(p)O4. Our results are also relevant for disordered interacting boson systems.
我们表明，几何临界性与量子涨落的相互作用导致了稀释磁体中渗流量子相变的一种新型普适类。所有涉及动力学关联的临界指数都不同于经典渗流值，但在二维中它们仍可精确确定。我们发展了这种转变的完整标度理论，并将其与最近在La2Cu(1-p)(Zn,Mg)(p)O4中的实验联系起来。我们的结果也与无序相互作用玻色子系统相关。
