[institut] SCL Seminar: Jernej Mravlje, Friday, 17 November, 14:00

[Darko Tanaskovic]

Dear colleagues,

You are cordially invited to the SCL seminar of the Center for the Study 
of Complex Systems, which will be held on Friday, 17 November 2017 at 
14:00 in the library reading room “Dr. Dragan Popović" of the Institute 
of Physics Belgrade. The talk entitled

"DMFT insights to incoherent transport in strongly correlated metals"

will be given by Dr. Jernej Mravlje ("Jozef Stefan" Institute, 
Ljubljana, Slovenia).

Abstract of the talk:

The electronic transport is one of the most poorly understood aspects of 
strongly correlated electron systems. The resistivity is often found at 
large temperatures to exceed the Mott-Ioffe-Regel (MIR) value that 
corresponds to a scattering event every lattice spacing.  This 
bad-metallic behavior that cannot be understood in terms of Boltzmann
quasiparticle transport is currently explored by several different 
theoretical approaches.

We investigated this regime for a doped Mott insulator using the 
dynamical mean-field theory (DMFT) and high-temperature expansion 
approaches. The DMFT equations are solved using the state-of-the art 
quantum-Monte-Carlo and numerical renormalization group methods and 
consistency between the obtained results demonstrates their accuracy. 
Along resistivity we calculated also the single-particle spectral 
functions and the charge compressibility.  When resistivity exceeds the 
MIR value, the quasiparticles melt and one enters into a regime in which 
the scattering rate (diffusion constant) saturate and the carrier 
density (charge compressibility) drops as 1/temperature. In this regime 
(in which resistivity is linear in
temperature), the bad-metal is somewhat similar to a doped semiconductor 
dominated by the temperature evolution of the carrier number rather than 
the scattering. We will discuss the relevance of the results for the 
behavior found in real materials and optical lattices and compare them 
against other theoretical approaches.

Best regards,
Darko Tanaskovic