Quantum corrections to the spin-wave spectrum of La${}_2$CuO${}_4$ in an external magnetic field

I. Ya. Korenblit, A. Aharony, O. Entin-Wohlman

The effects of quantum fluctuations on the magnetic field dependence of the spin-wave gaps in the lamellar antiferromagnet La${}_2$CuO${}_4$ are considered. Nonlinear corrections to th…