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Welcome to Wiki of the Quantum Transport Theory Group


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About QTTG

Our group conducts research on the frontier problems of quantum transport of electron charge and spin in a variety of nanostructures. The that we are currently pursuing include:

We are also working on the development of new theoretical and computational formalisms, often involving massively parallel codes, which are required to study quantum many-body systems far from equilibrium. The principal tools that we employ daily include nonequilibrium Green function theory, density functional theory, and dynamical mean field theory.

Our research is supported by the National Science Foundation and the U.S. Department of Energy.

Research Highlights

Ti te.png
The image on the left depicts graphene nanoribbon which is converted into a two-dimensional topological insulator (2D TI) using heavy adatoms (which locally enhance spin-orbit coupling). We have predicted that the edge currents in this 2D TI will generate highly optimized Seebeck coefficient, while its nanopores will block phonon propagation, which together conspire to produce a thermoelectric figure of merit ZT\simeq 3 at low temperatures T\sim 40\ {\mathrm  {K}}.

News

Recently Completed Projects

QTTG Mottos

  • The outcome of any serious research can only be to make the two questions grow where only one grew before.
  • If you can’t explain it simply, you don’t understand it well enough. (Albert Einstein)
  • The scientists of today think deeply instead of clearly. One must be sane to think clearly, but one can think deeply and be quite insane. (Nikola Tesla).
  • Don't give me excuses, give me results! (Penguins of Madagascar)
  • Employing the computer for the study of a model has the feeling of an experiment: you can ask clever "questions" to the "sample" under study, analyze data, and come up with an intuitive picture of what is happening. Very often the computer results are not what we were expecting a priori, thus there is a neat back and forth process until a convergence to a firm conclusion is reached. (Elbio Dagotto).


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