Finite-temperature spectra and quasiparticle interference in Kondo lattices: From light electrons to coherent heavy quasiparticles

被引:27
作者
Benlagra, Adel [1 ]
Pruschke, Thomas [2 ]
Vojta, Matthias [1 ]
机构
[1] Tech Univ Dresden, Inst Theoret Phys, D-01062 Dresden, Germany
[2] Univ Gottingen, Inst Theoret Phys, D-37077 Gottingen, Germany
来源
PHYSICAL REVIEW B | 2011年 / 84卷 / 19期
关键词
NUMERICAL RENORMALIZATION-GROUP; PERIODIC ANDERSON MODEL; INFINITE DIMENSIONS; HUBBARD-MODEL; HIDDEN ORDER; TRANSITION; IMPURITY; ENERGY; BI2SR2CACU2O8+DELTA; RESONANCE;
D O I
10.1103/PhysRevB.84.195141
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Recent advances in scanning tunneling spectroscopy performed on heavy-fermion metals provide a window onto local electronic properties of composite heavy-electron quasiparticles. Here we theoretically investigate the energy and temperature evolution of single-particle spectra and their quasiparticle interference caused by pointlike impurities in the framework of a periodic Anderson model. By numerically solving dynamical mean-field theory equations, we are able to access all temperatures and to capture the crossover from weakly interacting c and f electrons to fully coherent heavy quasiparticles. Remarkably, this crossover occurs in a dynamical fashion at an energy-dependent crossover temperature. We study in detail the associated Fermi-surface reconstruction and characterize the incoherent regime near the Kondo temperature. Finally, we link our results to current heavy-fermion experiments.
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页数:14
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