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Regular version of the site

Article

U(1) and SU(2) quantum dissipative systems: The Caldeira-Leggett vs. the Amegaokar-Eckern-Schön approaches

Journal of Experimental and Theoretical Physics. 2016. Vol. 122. P. 576-586.
Shnirman A., Saha A., Burmistrov I., Kiselev M., Altland A., Gefen Y.

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).