Wen Zhang Former Group Member Email: zhangwen@usc.edu Curent Location: analyst, Opera Solutions Working on: Quantum Magnetism Quantum Information Theory
My interests are in quantum systems and magnetism, especially topics related to optical and magnetic properties of materials. Recently, I have studied the topological entropy in Kitaev's toric code in the presence of a Zeeman field. Presently, I am looking into the phase diagrams of micromagnets and quantum phenomena in nanomagnets.

Papers Written:

2010:

• Phase diagram of magnetization reversal processes in nanorings
  W. Zhang and S. Haas, Phys. Rev. B 81, 064433 (2010).

• Phase diagram of magnetization reversal processes in nanorings
  W. Zhang and S. Haas, Phys. Rev. B 81, 064433 (2010).

• Topological order following a quantum quench
  D.I. Tsomokos, A. Hamma, W. Zhang, R. Fazio and S. Haas, Phys. Rev. A 80, 060302 (2009)

• Adaptation and Performance of the Cartesian Coordinates Fast Multipole Method for Nanomagnetic Simulations
  W. Zhang and S. Haas, Journal of Magnetism and Magnetic Materials 321, 3687 (2009)

• Scaling analysis and application: Phase diagram of magnetic nanorings and elliptical nanoparticles
  W. Zhang, R. Singh, N. Bray-Ali, and S. Haas, Phys. Rev. B 77, 144428 (2008)

• Entanglement, fidelity, and topological entropy in a quantum phase transition to topological order
  A. Hamma, W. Zhang, S. Haas, and D. A. Lidar, Phys. Rev. B 77, 155111 (2008)

• Entanglement, fidelity, and topological entropy in a quantum phase transition to topological order
  A. Hamma, W. Zhang, S. Haas, and D. A. Lidar, Phys. Rev. B 77, 155111 (2008)