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

Fasth, Carina LU and Xu, Hongqi LU (2003) In Physica E: Low-Dimensional Systems and Nanostructures 17(1-4). p.579-583
Abstract
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
quantum dots, two- and, waveguides, phase properties, quantum transport, three-terminal systems
in
Physica E: Low-Dimensional Systems and Nanostructures
volume
17
issue
1-4
pages
579 - 583
publisher
Elsevier
external identifiers
  • wos:000182700700195
  • scopus:0037393140
ISSN
1386-9477
DOI
10.1016/S1386-9477(02)00875-5
language
English
LU publication?
yes
id
f9384b16-8482-4b40-922b-c1b17c3e2920 (old id 311914)
date added to LUP
2007-09-03 07:33:19
date last changed
2018-01-07 08:33:18
@article{f9384b16-8482-4b40-922b-c1b17c3e2920,
  abstract     = {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.},
  author       = {Fasth, Carina and Xu, Hongqi},
  issn         = {1386-9477},
  keyword      = {quantum dots,two- and,waveguides,phase properties,quantum transport,three-terminal systems},
  language     = {eng},
  number       = {1-4},
  pages        = {579--583},
  publisher    = {Elsevier},
  series       = {Physica E: Low-Dimensional Systems and Nanostructures},
  title        = {Effects of breaking current conservation on the phase properties of two-terminal quantum systems},
  url          = {http://dx.doi.org/10.1016/S1386-9477(02)00875-5},
  volume       = {17},
  year         = {2003},
}