5 papers
Macroscopic Quantum Coherence in Small Antiferromagnetic Particle and the Quantum Interference Effects
Y. -H. Nie, Y. -B. Zhang, J. -Q. Liang +2
Starting from the Hamiltonian operator of the noncompensated two-sublattice model of a small antiferromagnetic particle, we derive the effective Lagrangian of a biaxial antiferroma…
Periodic Bounce for Nucleation Rate at Finite Temperature in Minisuperspace Models
J. -Q. Liang, H. J. W. Müller-Kirsten, Y. -B. Zhang +3
The periodic bounce configurations responsible for quantum tunneling are obtained explicitly and are extended to the finite energy case for minisuperspace models of the Universe. A…
Crossover from thermal hopping to quantum tunneling in Mn_{12}Ac
S. P. Kou, J. Q. Liang, Y. B. Zhang +2
The crossover from thermal hopping to quantum tunneling is studied. We show that the decay rate with dissipation can accurately be determined near the crossover temperature. Be…
Quantum-Classical Phase Transition of Escape rate in Biaxial Spin Particles
Y. -B. Zhang, J. -Q. Liang, H. J. W. Muller-Kirsten +3
The escape rates of the biaxial single domain spin particles with and without an applied magnetic field are investigated. Using the strict potential field description of spin syste…
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…