Quantum Tunneling of the Magnetic Moment in a Free Particle
M. F. O'Keeffe, E. M. Chudnovsky, and D. A. Garanin
TL;DR
This paper investigates how the mechanical freedom of a symmetric rotor influences the quantum tunneling of its magnetic moment, revealing energy level structures, phase transitions, and shape-dependent effects.
Contribution
It provides exact energy levels and magnetic moments for a free particle with rotational degrees of freedom, highlighting the impact of shape and inertia on spin tunneling.
Findings
Magnetic moment depends strongly on moments of inertia.
Quantum phase transitions occur between states with different magnetic moments.
Shape of the particle affects the quantum phase diagram.
Abstract
We study tunneling of the magnetic moment in a particle that has full rotational freedom. Exact energy levels are obtained and the ground-state magnetic moment is computed for a symmetric rotor. The effect of the mechanical freedom on spin tunneling manifests itself in a strong dependence of the magnetic moment on the moments of inertia of the rotor. Energy of the particle exhibits quantum phase transitions between states with different values of the magnetic moment. Particles of various shapes are investigated and quantum phase diagram is obtained.
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