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**Harvard**

Holmqvist, C. (2009) *Studies on hybrid superconducting junctions*. Göteborg : Chalmers University of Technology (Technical report MC2 - Department of Microtechnology and Nanoscience, Chalmers University of Technology, nr: 149).

** BibTeX **

@book{

Holmqvist2009,

author={Holmqvist, Cecilia},

title={Studies on hybrid superconducting junctions},

abstract={In the field of nanoelectronics, one seeks to combine quantum mechanical effects with macroscopic entities such as currents in order to find new ways of storing and manipulating information. One possibility to accomplish this is to use the quantum correlations found in superconductors. Teaming superconductors with normal metals and magnetic systems, one can obtain novel correlation and fluctuation effects.
In the first work of this thesis, we examine how charge correlations in a metallic dot are modified due to the presence of a capacitively coupled superconducting island. It is possible to overcome the Coulomb repulsion between electrons in a hybrid double-dot system consisting of a metallic island coupled capacitively to a Cooper-pair box. The superconducting island S acts as a dynamic gate on the metallic island N and in the strong coupling regime the electric charge of the Cooper pairs in S and their fluctuations are able to overscreen the repulsion between electrons in N. This produces an attractive interaction between two additional electrons in the metallic island and results in a non-monotonous charging curve of the metallic island.
The second part of the thesis considers how the dynamics of a precessing molecular magnetic moment affects the Josephson current. The precession gives rise to a time-dependent tunnel potential which not only creates different tunneling probabilities for spin-up and spin-down quasiparticles, but also introduces a time-dependent spin-flip term. In particular, we study the effects of the spin-flip term alone on the Josephson current between two spin-singlet superconductors as a function of precession frequency and junction transparency. The system displays a nonequilibrium steady-state solution which depends on the precession frequency of the classical spin.
},

publisher={Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik, Chalmers tekniska högskola,},

place={Göteborg},

year={2009},

series={Technical report MC2 - Department of Microtechnology and Nanoscience, Chalmers University of Technology, no: 149},

keywords={Negative Charging Energy, Attractive Correlations, Single-Electron Box, Josephson Junction, Josephson Current, Critical Current, Quasiclassical Superconductivity},

note={66},

}

** RefWorks **

RT Dissertation/Thesis

SR Print

ID 93820

A1 Holmqvist, Cecilia

T1 Studies on hybrid superconducting junctions

YR 2009

AB In the field of nanoelectronics, one seeks to combine quantum mechanical effects with macroscopic entities such as currents in order to find new ways of storing and manipulating information. One possibility to accomplish this is to use the quantum correlations found in superconductors. Teaming superconductors with normal metals and magnetic systems, one can obtain novel correlation and fluctuation effects.
In the first work of this thesis, we examine how charge correlations in a metallic dot are modified due to the presence of a capacitively coupled superconducting island. It is possible to overcome the Coulomb repulsion between electrons in a hybrid double-dot system consisting of a metallic island coupled capacitively to a Cooper-pair box. The superconducting island S acts as a dynamic gate on the metallic island N and in the strong coupling regime the electric charge of the Cooper pairs in S and their fluctuations are able to overscreen the repulsion between electrons in N. This produces an attractive interaction between two additional electrons in the metallic island and results in a non-monotonous charging curve of the metallic island.
The second part of the thesis considers how the dynamics of a precessing molecular magnetic moment affects the Josephson current. The precession gives rise to a time-dependent tunnel potential which not only creates different tunneling probabilities for spin-up and spin-down quasiparticles, but also introduces a time-dependent spin-flip term. In particular, we study the effects of the spin-flip term alone on the Josephson current between two spin-singlet superconductors as a function of precession frequency and junction transparency. The system displays a nonequilibrium steady-state solution which depends on the precession frequency of the classical spin.

PB Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik, Chalmers tekniska högskola,

T3 Technical report MC2 - Department of Microtechnology and Nanoscience, Chalmers University of Technology, no: 149

LA eng

OL 30