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Portrait of Carina Fasth

Carina Fasth

Associate Professor

Portrait of Carina Fasth

Effects of breaking current conservation on the phase properties of two-terminal quantum systems

Author

  • Carina Fasth
  • Hongqi Xu

Summary, in English

We study the reflection and transmission phase properties of two-terminal quantum structures coupled to a third lead. The systems are effectively three-terminal and current conservation is broken with regard to the original two-terminal systems. Two structures, a waveguide with an attached stub quantum dot and a waveguide with an inline, double-barrier confined quantum dot, are considered. The transmission and reflection phase properties are calculated for these systems with different couplings to the third lead. The results show that the discontinuous phase shifts seen in the current-conserved two-terminal systems are removed when the third lead is attached. However, as long as the coupling between the quantum systems and the additional lead is weak, sharp but continuous phase drops within narrow energy ranges can still be clearly identified.

Department/s

  • Solid State Physics

Publishing year

2003

Language

English

Pages

579-583

Publication/Series

Physica E: Low-Dimensional Systems and Nanostructures

Volume

17

Issue

1-4

Document type

Journal article

Publisher

Elsevier

Topic

  • Condensed Matter Physics

Keywords

  • quantum dots
  • two- and
  • waveguides
  • phase properties
  • quantum transport
  • three-terminal systems

Status

Published

ISBN/ISSN/Other

  • ISSN: 1386-9477