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TT: Tiefe Temperaturen
TT 34: Correlated Electrons - Quantum Impurities, Kondo Physics
TT 34.5: Talk
Wednesday, March 9, 2005, 10:45–11:00, TU H104
Bosonic Kondo effect of a magnetic impurity in a deconfined magnet — •Lars Fritz1, Serge Florens1, Matthias Vojta1, and Kedar Damle2 — 1Institut für Theorie der Kondensierten Materie, Universität Karlsruhe,76128 Karlsruhe — 2Department of Theoretical Physics, Tata Institute of Fundamental Research, Mumbai, India
Recent works have proposed the occurrence of deconfined s=1/2 gapless bosonic degrees of freedom at the quantum critical point separating the Neel state from the valence-bond phase in some two-dimensional quantum antiferromagnets. We propose to couple such systems to a single magnetic impurity. We find within a large-N approach a quenching of the extra moment, which provides a bosonic analog to the Kondo effect in metals. This behavior is in strong contrast to the known Curie susceptibility shown in usual confining critical points, and could serve as a probe for deconfinement in critical antiferromagnets.