7 papers · 1 filter
Macroscopic Quantum Phase Interference in Antiferromagnetic Particles
Yi-Hang Nie, Yan-Hong Jin, J. -Q. Liang +3
The tunnel splitting in biaxial antiferromagnetic particles is studied with a magnetic field applied along the hard anisotropy axis. We observe the oscillation of tunnel splitting…
Quantum Phase Interference for Quantum Tunneling in Spin Systems
J. -Q. Liang, H. J. W. Müller-Kirsten, D. K. Park +1
The point-particle-like Hamiltonian of a biaxial spin particle with external magnetic field along the hard axis is obtained in terms of the potential field description of spin syst…
The Wess-Zumino term and quantum tunneling
J. - Q. Liang, L. Maharana, H. J. W. Mueller-Kirsten
The significance of the Wess--Zumino term in spin tunneling is explored, and a formula is established for the splitting of energy levels of a particle with large fermionic spin as…
Quantum Tunneling and Phase Transitions in Spin Systems with an Applied Magnetic Field
S. -Y. Lee, H. J. W. Mueller-Kirsten, D. K. Park +1
Transitions from classical to quantum behaviour in a spin system with two degenerate ground states separated by twin energy barriers which are asymmetric due to an applied magnetic…
Periodic Instantons and Quantum-Classical Transitions in Spin Systems
J. -Q. Liang, H. J. W. Mueller-Kirsten, D. K. Park +1
Some models allowing explicit calculation of periodic instantons and evaluation of their action are studied with regard to transitions from classical to quantum behaviour as the te…
Enhancement of Quantum Tunneling for Excited States in Ferromagnetic Particles
J. -Q. Liang, Y. -B. Zhang, H. J. W. Mueller-Kirsten +3
A formula suitable for a quantitative evaluation of the tunneling effect in a ferromagnetic particle is derived with the help of the instanton method. The tunneling between n-th de…