Regensburg 2010 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 21: FS: Quantum Criticality in Strongly Correlated Metals

TT 21.3: Topical Talk

Mittwoch, 24. März 2010, 10:50–11:30, H20

Orbital-selective Mott transitions: Heavy Fermions and beyond — •Matthias Vojta — Institut für Theoretische Physik, Universität zu Köln, Germany

Quantum phase transitions in metals are often accompanied by non-Fermi liquid behavior and the appearence of novel phases in the vicinity of the quantum critical point. Among the interesting theoretical concepts is that of an orbital-selective Mott transition, which - in heavy-fermion metals - is equivalent to a breakdown of the Kondo effect. I will discuss aspects of both the quantum critical regime and the possibly emerging paramagnetic non-Fermi liquid phase, dubbed fractionalized Fermi liquid. Electron-lattice coupling can turn the orbital-selective Mott transition into a quantum version of the Kondo volume collapse. In addition, I will discuss the realization of fractionalized Fermi liquids in single-band models of correlated electrons, with an eye towards cuprate superconductors.