Visiting staff

Chris Hamer

MSc Melb., PhD Calif. Inst. Tech., DipCompSc Canberra, FAIP

Visiting Associate Professor

Department and Research Groups

Theoretical Physics

Condensed Matter Physics

Chris Hamer

Research Interests

My research interests lie in theoretical physics, at the interface between particle physics and statistical mechanics. Our group studies quantum lattice models, which may represent atomic spins in a magnet, electrons in a superconductor, or quarks confined within the proton. Various methods of treating such models have been employed including series expansions, Monte Carlo simulations, exact diagonalization and the density matrix renormalization group (DMRG). We are also interested in "effective field theories" for systems at a critical point.

We have recently published a book on series expansion techniques, ‘Series Expansion Methods for Strongly Interacting Lattice Models’, by Jaan Oitmaa, Chris Hamer and Weihong Zheng (Cambridge University Press, 2006). Much of our computational work in this area was carried out by our late friend and colleague, Dr Weihong Zheng, who collected many of his codes used in this field at his personal website.

Being now retired, I am continuing research on a part-time basis. One current interest is the construction of an effective field theory for the ‘Union Jack’ spin model.

Selected Publications

  • Restoration of symmetry in the spectrum of the bilayer Heisenberg antiferromagnet, C. J. Hamer, J. Oitmaa and Zheng Weihong, Phys. Rev B 85, 014432 (2012).
  • Reinforcing the NPT, C.J. Hamer, Australian Journal of International Affairs 65, 577-588 (2011).
  • Phase diagram of the frustrated Heisenberg antiferromagnet on the union jack lattice, W-H. Zheng, J. Oitmaa and C. J. Hamer, Phys. Rev. B75, 184418-1-10 (2007).
  • Jaan Oitmaa, Chris Hamer, and Weihong Zheng, ‘Series Expansion Methods for Strongly Interacting Lattice Models’, (Cambridge University Press, 2006)
  • Spectral Weight Contributions of Many-Particle Bound States and Continuum. W-H. Zheng, C.J. Hamer, and R.R.P. Singh, Phys. Rev. Letts. 91, 037206 (2003).
  • Density Matrix Renormalization Group Approach to the Lattice Schwinger Model. T.M.R. Byrnes, P. Sriganesh, R.J. Bursill and C.J. Hamer, Phys. Rev. D66, 013002 (2002)
  • Strong-Coupling Expansions for Multiparticle Excitations: Continuum and Bound States. S. Trebst, H. Monien, C.J. Hamer, Zheng W-H. and R.R.P. Singh, Phys. Rev. Letts. 85, 4373 (2000)
  • Phase diagram of a Heisenberg Spin-Peierls Model with Quantum Phonons, R.J. Bursill, R.H. McKenzie and C.J. Hamer, Phys. Rev. Letts. 83, 408 (1999)
  • Ground-state parameters, Finite-size Scaling and Low-temperature Properties of the Two-dimensional S=1/2 XY model, A.W. Sandvik and C.J. Hamer, Phys. Rev. B60, 6588 (1999)

Other Interests

I have long been interested in the problem of arms control and the elimination of nuclear weapons, and have acted as Convenor of the General Educatio course GENS4008: Nuclear Arms and the New World Order since its inception. I believe that global problems require global solutions, and to promote these ideas I have written a book on world federalism entitled “A Global Parliament”. I have initiated in conjunction with A/Prof. Shirley Scott in International Relations another General Education course GENT0708: International Governance in the 21st Century. In 2004 I founded the World Citizens Association (Australia) to help in the campaign for better global governance.

Contact Details 

Mail Address

School of Physics
The University of New South Wales


Email Address

Phone Number

61 2 9385 4590

Facsimile Number

61 2 9385 6060