Gordon Godfrey Theoretical Seminar 2005
Novel
phenomena from nonmagnetic impurities in frustrated spin systems
Dr.
Bruce Normand
University of Fribourg
Switzerland
Date
3 p.m Friday, 2 December, 2005
School of Physics,
Room 5
Abstract
Doping by nonmagnetic impurities has emerged as an important
probe of the magnetic correlations in low-dimensional spin systems.
Here we analyse the situation in frustrated quantum spin liquids in
1d and in 2d. These systems contradict the conventional wisdom that
one nonmagnetic impurity liberates one effective free spin degree of
freedom. Static impurities freeze local dimer configurations, and induce
dimer-dimer correlations and local magnetic moments over a considerable
range despite very short spin correlation lengths. The impurities experience
a highly unconventional mutual repulsion which suggests spin-charge
separation and spinon deconfinement in both one and two dimensions.
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