| Título: | Quantum electrodynamic fluctuations of the macroscopic Josephson phase |
| Autores: | Kohler, Heiner ; Guinea, Francisco ; Sols, Ignacio |
| Tipo de documento: | texto impreso |
| Editorial: | Elsevier, 2004-03 |
| Dimensiones: | application/pdf |
| Nota general: | info:eu-repo/semantics/restrictedAccess |
| Idiomas: | |
| Palabras clave: | Estado = Publicado , Materia = Ciencias: Química: Matemáticas , Tipo = Artículo |
| Resumen: |
We study the equilibrium dynamics of the relative phase in a superconducting Josephson link taking into account the quantum ?uctuations of the electromagnetic vacuum. The photons act as a superohmic heat bath on the relative Cooper pair number and thus, indirectly, on the macroscopic phase di?erence /. This leads to an enhancement of the mean square h/2 i that adds to the spread due to the Coulomb interaction carried by the longitudinal electromagnetic ?eld. We also include the interaction with the electronic degrees of freedom due to quasiparticle tunneling, which couple to the phase and only indirectly to the particle number. The simultaneous inclusion of both the radiation ?eld ?uctuations and quasiparticle tunneling leads to a novel type of particle-bath Hamiltonian in which the quantum particle couples through its position and momentum to two independent bosonic heat baths. We study the interplay between the two mechanisms in the present context and ?nd interference contributions to the quantum ?uctuations of the phase. We explore the observability of the QED e?ects discussed here. |
| En línea: | https://eprints.ucm.es/id/eprint/22015/1/sols37.pdf |
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