Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1997-12-22
Phys. Rev. Lett. 80, 5790 (1998).
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, REVTex, 3 Postscript figures
Scientific paper
10.1103/PhysRevLett.80.5790
We consider quantum spin systems with dimerization, which at strong coupling have singlet ground states. To account for strong correlations, the excitations are described as dilute Bose gas of degenerate triplets with infinite on-site repulsion. This approach is applied to the two-layer Heisenberg model at zero temperature with general couplings. Our analytic results for the triplet gap, the excitation spectrum and the location of the quantum critical point are in excellent agreement with numerical results, obtained by dimer series expansions.
Kotov Valeri N.
Oitmaa Jaan
Sushkov Oleg
Weihong Zheng
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