Tunnelling of a large spin: mapping onto a particle problem

摘要: The tunnelling of a single quantum spin is studied in the limit large number S. problem mapped onto particle on positive half-line with Hamiltonian which invariant under inversion x to 1/x. Not only ground-state energy but also all other levels and corresponding level splittings (if any) are computed by using conventional WKB methods for an excellent agreement numerical data found.