120 citations · 576 across the 38 of their papers we have counts for
6 papers · 2 filters
Diabolical Points in Molecular Magnets with a Four-Fold Easy Axis
Chang-Soo Park, Anupam Garg
We study the points of degeneracy (diabolical points) in magnetic molecules such as Mn_{12}-acetate that have an easy axis of four-fold symmetry. This is done for general magnetic…
The Semiclassical Propagator for Spin Coherent States
Michael Stone, Kee-Su Park, Anupam Garg
We use a continuous-time path integral to obtain the semiclassical propagator for minimal-spread spin coherent states. We pay particular attention to the ``extra phase'' discovered…
Quenched Spin Tunneling and Diabolical Points in Magnetic Molecules: II. Asymmetric Configurations
Anupam Garg
The perfect quenching of spin tunneling first predicted for a model with biaxial symmetry, and recently observed in the magnetic molecule Fe_8, is further studied using the discret…
Tunnel splittings for one dimensional potential wells revisited
Anupam Garg
The WKB and instanton answers for the tunnel splitting of the ground state in a symmetric double well potential are both reduced to an expression involving only the functionals of…
Quenched Spin Tunneling and Diabolical Points in Magnetic Molecules: I. Symmetric Configurations
Anupam Garg
The perfect quenching of spin tunneling that has previously been discussed in terms of interfering instantons, and has recently been observed in the magnetic molecule \Fe8, is trea…
Diabolical points in the magnetic spectrum of Fe_8 molecules
Anupam Garg
The magnetic molecule Fe_8 has been predicted and observed to have a rich pattern of degeneracies in its spectrum as an external magnetic field is varied. These degeneracies have n…