Glossop Matthew T, Ingersent Kevin
Department of Physics, University of Florida, Gainesville, Florida 32611-8440, USA.
Phys Rev Lett. 2005 Aug 5;95(6):067202. doi: 10.1103/PhysRevLett.95.067202. Epub 2005 Aug 4.
We extend the numerical renormalization-group method to Bose-Fermi Kondo models (BFKMs), describing a local moment coupled to a conduction band and a dissipative bosonic bath. We apply the method to the Ising-symmetry BFKM with a bosonic bath spectral function eta(omega) proportional omega(s), of interest in connection with heavy-fermion criticality. For 0 < s < 1, an interacting critical point, characterized by hyperscaling of exponents and omega/T scaling, describes a quantum phase transition between Kondo-screened and localized phases. A connection is made to other results for the BFKM and the spin-boson model.
我们将数值重整化群方法扩展到玻色-费米近藤模型（BFKMs），该模型描述了一个与导带和耗散玻色子浴耦合的局域磁矩。我们将该方法应用于具有与ω^s成正比的玻色子浴谱函数η(ω)的伊辛对称BFKM，这与重费米子临界性相关。对于0 < s < 1，一个以指数的超标度和ω/T标度为特征的相互作用临界点描述了近藤屏蔽相和局域相之间的量子相变。建立了与BFKM和自旋-玻色子模型的其他结果的联系。
