Abstract
The symmetric spin-boson model without external field is treated for any type of coupling to the boson bath and any initial bath density matrix. With initially fully aligned spin (〈σz〉 (0)= =1), the proof is given that a partial relaxation (〈σz〉 (+∞) t1<) implies that there is no asymptotic-time (up-and-down) symmetry breaking (i.e. that 〈σz〉 (+∞)=0). For the problem of a particle (interacting with free bosons) in a symmetric double well without spatial symmetry breaking before the infinite time limit, this means that att→ + ∞ the particle distribution becomes symmetric (irrespective of the full initial asymmetry) unless the particle fully remains (att→ + ∞) in Ihe starting well.
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Čápek, V. Absence of asymptotic-time symmetry breaking in zero-bias spin-boson model with partial relaxation. Czech J Phys 40, 857–863 (1990). https://doi.org/10.1007/BF01597957
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DOI: https://doi.org/10.1007/BF01597957