1988 Ph. D., Physics , Brown University ,
1985 M. Sc., Physics , Brown University,
1983 B. Sc., Physics University of Belgrade,
of metal-insulator transitions came to a renewed focus in the last
eighteen years, with the discovery of high temperature
superconductivity, which triggered much activity in the study of
"bad metals." Many of the materials in this family consist of
transition metal or even rare earth elements, corresponding to
compounds which are essentially on the brink of magnetism. Here,
conventional approaches proved of little help, but recent research
has lead to a veritable avalanche of new and exciting ideas and
techniques both on the experimental and the theoretical front.
In the last twelve years, a systematic new approach
to strong correlations has been developed, based on dynamical
mean-field theory (DMFT) methods. Our recent results have
demonstrated that all the basic localization mechanisms and
processes can be described within extended DMFT framework, and have
produced a number of results of direct experimental relevance.
- Theory for Anderson
localization effects in presence of strong correlations.
- Description of localization-induced Griffiths phases leading to
non-Fermi liquid (and/or spin liquid) metallic behavior.
- Theory describing how glassy behavior of electrons emerges
in the vicinity of disorder-driven metal-insulator transitions.
Some of the subjects that we have introduced have, in the
last few years, become topics of central interest and much activity.
This is especially true for glassy phenomena that emerge in many
electronic systems with disorder. Topics related to non-equilibrium
quantum dynamics are subjects of several upcoming major
international workshops and meetings". For example, I acted as the
principal organizer of the workshop "Complex Behavior in Correlated
Electron Systems" held at the Lorentz Center in Leiden (the
Netherlands) in August 2005. I believe that this direction for
research offers a great deal of promise and will continue to attract
increased attention in the coming years. Materials where these
phenomena are of central importance are surprisingly numerous,
ranging from two dimensional electron gases in MOSFETs, diluted
magnetic semiconductors, CMR manganites and high Tc cuprates. Our
theoretical approaches are very flexible and useful tools that
should play a central role in this emerging field.
In the last few
years, fascinating examples of complex ordering around the
metal-insulator transition are starting to emerge, due to advances
of both the experimental probes and the theoretical tools available.
Left panel: Percolative conduction in the half-metallic
ferromagnetic and ferroelectric mixture (La, Sr)MnO3.
Central panel: Inhomogeneous charge distribution
revealed by STM spectroscopy on underdoped cuprate
Right panel: Strikingly similar "stripe glass" ordering
is observed in a computer simulation of an appropriate model.
Developing analytical tools to describe such phenomena is one of the
principal goals of our research efforts.
2006-present, Professor, Florida State
2001-2006, Associate Professor, Florida State
1995-2001, Assistant Professor, Florida State
1991-1995, Postdoctoral Research Associate, Rutgers
1989-1991, Postdoctoral Research Associate,
University of Maryland
1988-1989, Postdoctoral Research
Associate, Brown University
1984-1988, Research Assistant, Brown
Awards, Honors &
Developing Scholar Award (2003)
Sloan Foundation Fellow (1997-1999)