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Professor
Chen,Hsin-Hsiung

 
Office¡G886-3-5731110 (PHYS R520)
Fax¡G886-3-5723052
E-mail¡Gchen@phys.nthu.edu.tw

Education
  1. 1967-1970 Ph.D. in Electrical Engineering, Johns Hopkins University, U.S.A.
  2. 1962-1966 B.E. in Electrical Engineering, National Cheng Kung University,R.O.C.
Professional Experience
Current position¡G
1974-present, Professor of Physics, National Tsing Hua University, R.O.C.
Experience¡G
  1. 1982-1983, Visiting Scholor in Physics Dept., UC San Diego
  2. 1971-1974, Adjunct Professor of Physics Dept., National Tsing Hua University, R.O.C.
  3. 1970-1971, Research Associate of Physics Dept., New York University
Honors and Awards
  1. 2001 Outstanding Teacher Award
Research Fields
  1. Statistical Physics
  2. Solid State Physics
Research Interests and achievement
Updated on September 3, 2006
My research work focused on phase transitions and critical phenomena of spin models. Systems studied included the Ising model, Potts model, Heisenberg model, etc. Methods used to investigate these systems were mainly various effective-field approximations and high temperature series expansions. Other techniques such as Monte Carlo simulations, the renormalization group approach were also applied.
When the exact solution is not available, it is generally believed that the high temperature series expansion method predicts most accurate critical properties of a spin model. We had calculated series expansions for the exchange interaction model, anisotropic Heisenberg model, planar classical Heisenberg model, etc. Reliable estimates of critical properties were obtained. In these studies, we developed a simple technique to represent and identify graphs numerically. We also proposed a unified definition of lattice constants such that various lattice constant systems previously studied are special cases of the generalized lattice constants.
For systems with first-order phase transitions or having complicated interactions, we determined thermodynamic properties qualitatively by various effective-field approximations. We developed a systematic approach to improve the effective-field approximations. We found that some antiferromagnetic systems with multipole interactions would have two or more successive phase transitions.
   
Selected Publications
  1. [2000] T.C. King and H.H. Chen, Cluster variation studies of the anisotropic exchange interaction model, Physica A 267 153 (1999), 359(2000)
  2. [1995] H.H. Chen, F. Lee and Y.M. Kao, Variational analyses of series expansions of the Potts model, Phys. Rev. B52, 39 (1995)
  3. [1993] H.H. Chen, S.C. Gou and Y.C. Chen, Antiferromagnetic ordering and phase transitions in the exchange interaction model and the Potts model on general lattices, Phys. Lett. A177, 248 (1993)
  4. [1991] Y.C. Chen, H.H. Chen and F. Lee, Quantum Monte Carlo study of the spin-1/2 Heisenberg model, Phys. Rev. B43, 11082 (1991)
  5. [1989] H.C. Tseng and H.H. Chen, A real-space renormalization group study of a semi-infinite Ising model, J. Phys. A22, 3351 (1989)
  6. [1981] F. Lee and H.H. Chen, Low temperature series expansions for lattices of non-integral dimensions, Phys. Lett., 82A, 140 (1981)
  7. [1973] H.H. Chen and P.M. Levy, Dipole and quadrupole phase transitions in spin-1 models, Phys. Rev. B7, 4267 (1973)
    • All Publications (Expansible)

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