Quantum renormalization of high-energy excitations in the 2D Heisenberg model
We find using Monte Carlo simulations of the spin-1/2 2D square lattice nearest neighbour quantum Heisenberg antiferromagnet that the high-energy peak locations at (pi, 0) and (pi/2, pi/2) differ by about 6%, (pi/2, pi/2) being the highest This is a deviation from linear spin wave theory which predicts equal magnon energies at these points.
NORDITA, DK-2100 Copenhagen O, Denmark. Riso Natl Lab, Condensed Matter Phys & Chem Dept, DK-4000 Roskilde, Denmark. Syljuasen, OF, NORDITA, Blegdamsvej 17, DK-2100 Copenhagen O, Denmark.
Record created on 2007-01-24, modified on 2016-08-08