2 research outputs found
One-dimensional spin-1/2 Heisenberg antiferromagnet in a weak external magnetic field
The one dimensional spin-1/2 Heisenberg antiferromagnet in a weak magnetic
field h is studied using the bosonization method. We derive a set of
renormalization group equations. The fixed point is reached when the field is
scaled to the value at which the system is quarter-filled. As the magnetic
field varies, a continuum line of fixed points is formed. We compute the
uniform longitudinal susceptibility . The singular behavior of
as is found to be contained in with a
non-universal constant. The spin-spin correlations in the magnetic field are
calculated.Comment: 5 pages, 1 figure, published on PR