Quantum Environments: Spin Baths, Oscillator Baths, and applications to Quantum Magnetism

Details Quantum Environments: Spin Baths, Oscillator Baths, and applications to Quantum Magnetism Quantum Environments: Spin Baths, Oscillator Baths, and applications to Quantum Magnetism

1998-10-26

arxiv.org/abs/cond-mat/9810353v1

pp. 101-197 in "Tunneling in Complex Systems", (World Sci, 1998)

Physics

Condensed Matter

Chapter in "Tunneling in Complex Systems" (World Sci., edited T. Tomsovic); 97 pages. Published in June 1998

Scientific paper

The low-energy physics of systems coupled to their surroundings is understood by truncating to effective Hamiltonians; these tend to reduce to a few canonical forms, involving coupling to "baths" of oscillators or spins. The method for doing this is demonstrated using examples from magnetism, superconductivity, and measurement theory, as is the way one then solves for the low-energy dynamics. Finally, detailed application is given to the exciting recent Quantum relaxation and tunneling work in naomagnets.

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