Quantum disordered ground state for the frustrated square lattice

Details Quantum disordered ground state for the frustrated square lattice Quantum disordered ground state for the frustrated square lattice

2011-10-14

arxiv.org/abs/1110.3162v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, proceedings SCES 2011

Scientific paper

We present Quantum Monte-Carlo simulations of an exchange-anisotropic spin-1/2 Heisenberg model on a square lattice with nearest and next-nearest neighbor interactions. The ground state phase diagram shows two classical magnetically ordered phases for dominating antiferromagnetic S^z-interactions and for large quantum fluctuations a ferromagnetic order in the x-y plane. In between a finite region is detected where neither classical nor quantum mechanical order, e.g. long-ranged dimer correlations, are found.

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