arXiv subjects

Jacob Sagi

Publications and source records attributed to Jacob Sagi.

2 recordsLinked to original sources

arXiv1995

Theory of Nuclear Magnetic Relaxation in Haldane Gap Antiferromagnets

A theory of Nuclear Magnetic Resonance (NMR) is developed for integer-spin, one-dimensional antiferromagnets, which exhibit the Haldane gap. We consider free boson, free fermion and non-linear sigma model approaches, all of which give similar results. Detailed anisotropy and magnetic field dependence is calculated and compared with experiment.

cond-mat↗

arXiv1993

Monopole-Catalysed Baryon Decay: A Boundary Conformal Field Theory Approach

Monopole-mediated baryon number violation, the Callan-Rubakov effect, is reexamined using boundary conformal field theory techniques. It is shown that the low-energy behaviour is described simply by free fermions with a conformally invariant boundary condition at the dyon location. When the number of fermion flavours is greater than two, this boundary condition is of a non-trivial type which has not been elucidated previously.

hep-th↗