Dasgupta, Chandan (1989) Variational calculation for the spin-(1/2 Heisenberg antiferromagnet on a square lattice. In: Physical Review B: Condensed Matter, 39 (1). 386 -391.
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The ground-state properties of the spin-(1/2 Heisenberg antiferromagnet on a square lattice are studied by using a simple variational wave function that interpolates continuously between the Néel state and short-range resonating-valence-bond states. Exact calculations of the variational energy for small systems show that the state with the lowest energy has long-range antiferromagnetic order. The staggered magnetization in this state is approximately 70% of its maximum possible value. The variational estimate of the ground-state energy is substantially lower than the value obtained for the nearest-neighbor resonating-valence-bond wave function.
|Item Type:||Journal Article|
|Additional Information:||Copyright of this article belongs to The American Physical Society.|
|Department/Centre:||Division of Physical & Mathematical Sciences > Physics|
|Date Deposited:||20 Oct 2010 06:01|
|Last Modified:||20 Oct 2010 06:01|
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