One-dimensional spin-1/2 Heisenberg antiferromagnet in a weak external magnetic field

Details One-dimensional spin-1/2 Heisenberg antiferromagnet in a weak external magnetic field One-dimensional spin-1/2 Heisenberg antiferromagnet in a weak external magnetic field

2000-02-07

arxiv.org/abs/cond-mat/0002104v1

Phys. Rev. B61, 349 (2000)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 1 figure, published on PRB

Scientific paper

10.1103/PhysRevB.61.349

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 $\chi_z(h)$. The singular behavior of $\chi_z(h)$ as $h\to 0$ is found to be contained in $1/\ln(h_o/h)$ with $h_o$ a non-universal constant. The spin-spin correlations in the magnetic field are calculated.

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