Bruder, C. and Glazman, L. I. and Larkin, A. I. and Mooij, J. E. and van Oudenaarden, A.. (1999) Phase transition in a chain of quantum vortices. Physical Review B, Vol. 59, H. 2. pp. 13831395.
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Official URL: http://edoc.unibas.ch/dok/A5839238
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Abstract
We consider interacting vortices in a quasionedimensional array of Josephson junctions with small capacitance. If the charging energy of a junction is of the order of the Josephson energy, the fluctuations of the superconducting order parameter in the system are considerable, and the Vortices behave as quantum particles. Their density may be tuned by an external magnetic field, and therefore one can control the commensurability of the onedimensional vortex lattice with the lattice of Josephson junctions. We show that the interplay between the quantum nature of a vortex and the longrange interaction between the vortices leads to the existence of a specific commensurateincommensurate transition in a onedimensional vortex lattice. In the commensurate phase an elementary excitation is a soliton with energy separated from the ground state by a finite gap. This gap vanishes in the incommensurate phase. Each soliton carries a fraction of a flux quantum; the propagation of solitons leads to a finite resistance of the array. We find the dependence of the resistance activation energy on the magnetic field and parameters of the Josephson array. This energy consists of the abovementioned gap, and also of a boundary pinning term, which is different in the commensurate and incommensurate phases. The developed theory allows us to explain quantitatively the available experimental data. [S01631829(99)004026].
Faculties and Departments:  05 Faculty of Science > Departement Physik > Physik > Theoretische Physik (Bruder) 

UniBasel Contributors:  Bruder, Christoph 
Item Type:  Article, refereed 
Article Subtype:  Research Article 
Publisher:  American Institute of Physics 
ISSN:  01631829 
Note:  Publication type according to Uni Basel Research Database: Journal article 
Identification Number: 

Last Modified:  14 Sep 2012 07:18 
Deposited On:  14 Sep 2012 06:44 
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