Research
Research Summaries
Multiscale Modeling
Dr. Quing Peng, under the direction of Dr. Gang Lu of the Department of Physics and Astronomy, is currently developing the Quasicontinuum D.F.T.
The Quasicontinuum (QC) method is a mixed continuum and atomistic approach for simulating the mechanical response of polycrystalline materials at zero temperature. The method reproduces the results of standard Lattice Statics techniques at a fraction of the computational cost.
Spin Tranfer Torque Studies
Dr. Yu-Hui Tang is Currenly working under Dr. Nick Kioussis of the Department of Physics and Astronomy at California State University Northridge.
Her research is focused on Effect of asymmetry on the bias dependence of perpendicular Spin Torque Magnetic Tunnel Junctions (MTJ).
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.
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.