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Research Interests

Correlation Phenomena in Advanced Materials

The major challenges now being posed for condensed matter and materials physics come from a world of small things and of complex things.  In this world, materials with at least one dimension at a nanometer scale exhibit quantum size/shape effects, modified thermodynamics, altered electronic properties and broken symmetries sometimes invoking bizarre Hamiltonians. On the other hand, various elusive collective behaviors emerge in the complex materials characterized by strong coupling between the spin, charge, and even orbital and lattice degrees of freedom.

At a fundamental level, correlated interactions among particles lie at the core of the world of nanoscience and complexity (or simply, advanced materials). Many-body correlation become dominant in nanostructures simply due to the fact that quasi-particles cannot avoid each other because of reduced dimensionality.  Strong correlations in a very dense medium, ~ 10^23 per cubic centimeters, are also responsible for the emergence of collective phenomena in complex systems.  The exact origin is still the center of the mysteries in current condensed matter physics and continues to be at the scientific frontiers where further exceptional advances can be expected. Our success in this correlation challenge will lead us to solve the issues of ultimate scientific and technological interests.

The combination of femtosecond time resolution, specially designed nanostructures and complex materials, and broadband probe capability opens unprecedented opportunities to investigate fundamental correlation phenomena. In this context, our current research is to explore

  1. Femtosecond Opto-magnetism and Phase Transitions

  2. Ultrafast Excitonic Correlation in Single-Walled Carbon Nanotubes

  3. Nonlinear Optics of Metamaterials

Please contact us for any project details.

 

 
 
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      This page is maintained by Jigang Wang (jwang@ameslab.gov), Last modified Sept 27th, 2008