Quantum phase analysis of 1D superconducting quantum dot lattice using extended Bose-Hubbard model

Kumari, M and Sarkar, S and Ramasesha, S (2009) Quantum phase analysis of 1D superconducting quantum dot lattice using extended Bose-Hubbard model. In: The European Physical Journal B - Condensed Matter and Complex Systems, 72 (4). pp. 503-507.

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Abstract

We have obtained the quantum phase diagram of a one-dimensional superconducting quantum dot lattice using the extended Bose-Hubbard model for different commensurabilities. We describe the nature of different quantum phases at the charge degeneracy point. We find a direct phase transition from the Mott insulating phase to the superconducting phase for integer band fillings of Cooper pairs. We predict explicitly the presence of two kinds of repulsive Luttinger liquid phases, besides the charge density wave and superconducting phases for half-integer band fillings. We also predict that extended range interactions are necessary to obtain the correct phase boundary of a one-dimensional interacting Cooper system. We have used the density matrix renormalization group method and Abelian bosonization to study our system.

Item Type:	Journal Article
Publication:	The European Physical Journal B - Condensed Matter and Complex Systems
Publisher:	Springer
Additional Information:	Copyright for this article belongs to Springer.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	05 Jan 2010 11:02
Last Modified:	19 Sep 2010 05:54
URI:	http://eprints.iisc.ac.in/id/eprint/25337

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