Spin transport in Strongly Correlated Systems

Dr. Hao Wang is currenlty conducting research under Dr. Donna Sheng of the California State University Department of Physics and Astronomy. His topic of research involves Topological Quantum Phase Transition in 5/2 FQHE System.

Abstract:

We report on the study of fractional quantum hall effect at filling
factor 5/2 using exact diagonization method with torus geometry in a
finite-size system. A model Hamiltonian with the additional
three-body interaction has been investigated. The calculation of the
wave function overlap indicates that a very weak three-body
interaction will induce a phase transition to a Pfaffian state or
its particle-hole conjugate (anti-Pfaffian) state depending on the
sign of the three-body interaction. The results from the low energy
spectrum, the wave function overlap, and the particle-hole parity
evolution, have shown the strong evidence of the existence of a
second order phase transition between the Pfaffian and the
anti-Pfaffian, with the pure Coulomb system sits at the critical
point of the transition.

A PDF of his seminar is given here.

For recent publications under Dr. Donna Sheng and Dr. Hao Wang, click Recent Publications link.

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