Theory of a two-level system strongly interacting with a degenerate Fermi gas

K. Vladár(Institute for Technical Physics and Materials Science), Gergely T. Zimányi(Institute for Technical Physics and Materials Science), A. Zawadowski(Institute for Technical Physics and Materials Science)
Physical Review Letters
January 27, 1986
Cited by 52

Abstract

A two-level system is treated which interacts with a degenerate fermionic heat bath. Arbitrarily strong screening by fermions is taken into account. The hopping of the two-level system may be spontaneous or assisted by the fermionic bath. By derivation of scaling equations it is shown for the spin-(1/2) case that because of the assisted hops the two-level system cannot be localized in one of the states.


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