2000/12/14 by M. Y. Choi, Sung Wu Rhee, Minchul Lee +2 · 3 citations
Physics and Astronomy · #Charge (physics) #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Coulomb #Electron #Josephson effect #Phase (matter) #Phase diagram #Phase transition #Physics #Physics of Superconductivity and Magnetism #Pi Josephson junction #Quantum #Quantum and electron transport phenomena #Quantum mechanics #Quantum phase transition #Renormalization group #Superconductivity #cond-mat
paper · pdf · doi:10.1103/physrevb.63.094516
published in Physical review. B, Condensed matter 63(9) (American Physical Society) · 2 figures, to appear in Phys. Rev. B
arxiv created 2000/12/14 · openalex publication_date 2001/02/12 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We study the quantum phase transition in a chain of superconducting grains, coupled by Josephson junctions, with emphasis on the effects of gate charges induced on the grains. At zero temperature the system is mapped onto a two-dimensional classical Coulomb gas, where the gate charge plays the role of an imaginary electric field. Such a field is found relevant in the renormalization-group transformation and to change the nature of the superconductor-insulator transition present in the system, tending to suppress quantum fluctuations and helping establish superconductivity. On the basis of this observation, we propose the zero-temperature phase diagram on the plane of the gate charge and the energy ratio.