Abstract
There are two paradigmatic frameworks for treating quantum systems coupled to a dissipative environment: the Caldeira–Leggett and Ambegaokar–Eckern–Schön approaches. Here, we recall the differences between them and explain the consequences of applying each to a zero-dimensional spin (having an SU(2) symmetry) in a dissipative environment (a dissipative quantum dot near or beyond the Stoner instability point).
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Contribution for the JETP special issue in honor of L.V. Keldysh’s 85th birthday
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Shnirman, A., Saha, A., Burmistrov, I.S. et al. U(1) and SU(2) quantum dissipative systems: the Caldeira–Leggett Versus Ambegaokar–Eckern–Schön approaches. J. Exp. Theor. Phys. 122, 576–586 (2016). https://doi.org/10.1134/S1063776116030109
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DOI: https://doi.org/10.1134/S1063776116030109