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Quantum tunneling of spin particles in periodic potentials with asymmetric twin barriers
1997
Physics Letters B
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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 ϵ_1, ϵ_2. We derive with Bloch theory the energy spectrum which has formally the structure of an energy band. The spectrum depends
doi:10.1016/s0370-2693(96)01628-0
fatcat:6jn74gadfjeexf75p7rdycm7ui