Quantum Phase Transitions in Spin Systems

Details Quantum Phase Transitions in Spin Systems Quantum Phase Transitions in Spin Systems

2001-05-27

arxiv.org/abs/cond-mat/0105517v1

Advances in Quantum Many-Body Theory, Vol. 5, edited by Raymond F. Bishop, Klaus A. Gernoth, and Niels R. Walet, (World Scient

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 12 Postscipt figures; Accepted for publication in World Scientific

Scientific paper

We discuss the influence of strong quantum fluctuations on zero-temperature phase transitions in a two-dimensional spin-half Heisenberg system. Using a high-order coupled cluster treatment, we study competition of magnetic bonds with and without frustration. We find that the coupled cluster treatment is able to describe the zero-temperature transitions in a qualitatively correct way, even if frustration is present and other methods such as quantum Monte Carlo fail.

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