Quantum Tunneling of Spin Particles in Periodic Potentials with Asymmetric Twin Barriers

Details Quantum Tunneling of Spin Particles in Periodic Potentials with Asymmetric Twin Barriers Quantum Tunneling of Spin Particles in Periodic Potentials with Asymmetric Twin Barriers

1996-12-10

arxiv.org/abs/hep-th/9612106v1

Phys.Lett. B393 (1997) 368-374

Physics

High Energy Physics

High Energy Physics - Theory

18 pages, LaTex, one figure

Scientific paper

10.1016/S0370-2693(96)01628-0

The tunneling effect of a periodic potential with an asymmetric twin barrier per period is calculated using the instanton method. The model is derived from the Hamiltonian of a small ferromagnetic particle in an external magnetic field using the spin-coherent-state path integral. The instantons in two neighbouring barriers differ and lead to different level shifts $\triangle\epsilon_1, \triangle\epsilon_2$. We derive with Bloch theory the energy spectrum which has formally the structure of an energy band. The spectrum depends on both level shifts. The removal of Kramer's degeneracy by an external magnetic field is discussed. In addition we find a new kind of quenching of macroscopic quantum coherence which is irrelevant to Kramer's degeneracy.

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