Thursday, May 23, 2013

1305.5111 (Pramod Kumar N. S. Vidhyadhiraja)

Non-Fermi liquid behaviour from dynamical effects of impurity scattering
in disordered Fermi liquids

Pramod Kumar N. S. Vidhyadhiraja
The interplay of disorder and interactions is a subject of perennial interest. In this work, we have investigated the effect of disorder due to chemical substitution on the dynamics and transport properties of correlated Fermi liquids. A low frequency analysis in the concentrated and dilute limits shows that the dynamical local potentials arising through disorder averaging generate a linear (in frequency) term in the scattering rate. Such non-Fermi liquid behaviour (nFL), present for any disorder concentration, is investigated in detail within dynamical mean field theory. We show that the nFL behaviour has features that are distinct from those arising through Griffiths singularities or distribution of Kondo scales. Relevance of our findings to experiments on alloyed correlated systems is pointed out.
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