Abstract
The ground state and the lowest excited states of the spin 1/2-Heisenberg model are investigated by exact diagonalization and variational Monte Carlo techniques. Our trial state represents a generalization of a wave function introduced by Hulthen, Kasteleijn and Marshall. The long range character of the spin-correlation function is in excellent agreement with exact diagonalization and also with recent neutron scattering results for La2CuO4. The asymptotic behavior of the spin-correlation function is found to differ from spin-wave theory. From the exact (N
Original language | English |
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Pages (from-to) | 181-193 |
Number of pages | 13 |
Journal | Zeitschrift für Physik: B |
Volume | 72 |
Issue number | 2 |
DOIs | |
Publication status | Published - 1988 |
Externally published | Yes |