Issue
Europhys. Lett.
Volume 76, Number 6, December 2006
Page(s) 1172 - 1178
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
DOI http://dx.doi.org/10.1209/epl/i2006-10385-0
Published online 16 November 2006
Europhys. Lett., 76 (6), pp. 1172-1178 (2006)
DOI: 10.1209/epl/i2006-10385-0

Quantum phase diagram of a superconducting quantum dots array

S. Sarkar

PoornaPrajna Institute of Scientific Research 4 Sadashivanagar, Bangalore 5600 80, India


received 5 July 2006; accepted in final form 19 October 2006
published online 16 November 2006

Abstract
We present the quantum phase diagram of a superconducting quantum dots array. Superconducting quantum dots are connected through Josephson junctions. We study the effect of finite-range Josephson coupling and also finite-range interactions between the dots. Our field-theoretical study predicts different kinds of phase near the charge degeneracy point. We predict two different kinds of repulsive Luttinger liquid phase and also the possibilities of different density wave instabilities from the inter-play of long-range interaction between the dots and Cooper pair density. We observe different multicritical points with interesting phases.

PACS
74.78.Na - Mesoscopic and nanoscale systems.
74.81.Fa - Josephson junction arrays and wire networks.
74.20.Mn - Nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, marginal Fermi liquid, Luttinger liquid, etc.).

© EDP Sciences 2006