Non Fermi Liquid Dynamics of the TwoChannel Kondo Lattice.pdfVIP

Non Fermi Liquid Dynamics of the Two-Channel Kondo Lattice M. Jarrell(a) , Hanbin Pang(a) , D.L. Cox(b) , F. Anders(b) , and A. Chattopadhyay(a) . (a) Department of Physics, University of Cincinnati, Cincinnati, OH 45221 (b)Department of Physics, The Ohio State University, Columbus, OH, 43202 (February 1, 2008) The paramagnetic phase of the two-channel Kondo lattice model is examined with a Quantum Monte Carlo simulation in the limit of infinite dimensions. We find non-Fermi-liquid behavior at low temperatures including a finite low-temperature single-particle scattering rate, no Fermi distribution discontinuity, and zero Drude weight. Both the optical and quasiparticle mass enhancement and scattering relaxation rate show consistent evidence of non-fermi liquid behavior. However, the low- energy density of electronic states is finite. 6 9 Keywords: non-Fermi liquid, Kondo lattice, dynamics 9 1 Introduction. The Fermi Liquid theory of Landau has of spin and charge quantum numbers), this results from provided a remarkably robust paradigm for describing the special point character of the Fermi surface. Whether p e the properties of interacting Fermion systems such as liq- the essential spin-charge separation may “bootstrap” into S uid 3He and alkali metals (e.g., sodium). The key notion higher dimensions remains unclear [4]. Among the re- 7 of this theory is that the low lying excitations of the inter- maining theories to explain experiment are those based 1 a