Nano Archive

Order parameter of a nanometre-scale s-wave superconducting grain in quantum tunnelling process: Frequency space analysis

Rezakhani , A. T. and Afzali , R. (2006) Order parameter of a nanometre-scale s-wave superconducting grain in quantum tunnelling process: Frequency space analysis. CHINESE PHYSICS LETTERS , 23 (4). pp. 967-970. ISSN 0256-307X

Full text is not hosted in this archive but may be available via the Official URL, or by requesting a copy from the corresponding author.

Official URL: http://iopscience.iop.org/0256-307X/23/4/057/?ejre...

Abstract

A nano-scale s-wave superconducting grain, coupled to a normal metallic contact through a tunnelling junction, is placed in an external magnetic field. We suppose that effect of this quantum tunnelling on the Fourier transform of the order parameter is in the form of a small additive correction to the BCS order parameter. At the first order approximation in terms of this correction term and by using an instanton method, the related Green functions (in frequency space) are obtained. By establishing a self-consistent configuration an analytic formula for the order parameter is also found. We also show that a departure from superconductivity can be captured by this formula. This change of state is indeed a manifestation of a quantum transition induced by quantum fluctuations. In this sense, this is an advantage of our simple method which, like other more elaborate methods, can detect a quantum transition in the state of the grain.

Item Type:Article
Subjects:Physical Science > Nanophysics
Physical Science > Nano objects
Material Science > Nanochemistry
Material Science > Nanostructured materials
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:7324
Deposited By:JNCASR
Deposited On:28 Oct 2009 09:40
Last Modified:28 Oct 2009 09:40

Repository Staff Only: item control page