Superconductor-insulator transition in Josephson junction chains by quantum Monte Carlo calculations

Basko, D. M.; Pfeiffer, F.; Adamus, P.; Holzmann, M. und Hekking, F. W. J. (2020): Superconductor-insulator transition in Josephson junction chains by quantum Monte Carlo calculations. In: Physical Review B, Bd. 101, Nr. 2, 024518

Abstract

We study the zero-temperature phase diagram of a dissipationless and disorder-free Josephson junction chain. Namely, we determine the critical Josephson energy below which the chain becomes insulating as a function of the ratio of two capacitances: the capacitance of each Josephson junction and the capacitance between each superconducting island and the ground. We develop an imaginary-time path integral quantum Monte Carlo algorithm in the charge representation, which enables us to efficiently handle the electrostatic part of the chain Hamiltonian. We find that a large part of the phase diagram is determined by anharmonic corrections which are not captured by the standard Kosterlitz-Thouless renormalization group description of the transition.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Physik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• ISSN: 2469-9950
• Sprache: Englisch