Two boundary Sine-Gordon models of Josephson devices
Domenico Giuliano
Abstract
We apply the two-boundary Sine-Gordon
formalism to study the renormalization of SQUID devices. We set up a general\
formalism to account for the nonperturbative renormalization of the Josephson
couplings $E_J$ in a variety of Josephson superconducting devices. This approach
has the advantage of being applicable no matter how strong are the quantum
fluctuations and helps in estabilishing interesting connections between
superconducting devices, fermionic quantum wires, and quantum impurity problems.