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Fano effect in a quantum-ring-quantum-dot system with tunable coupling

Fuhrer, Andreas LU ; Brusheim, Patrik LU ; Ihn, T; Sigrist, M; Ensslin, K; Wegscheider, W and Bichler, M (2006) In Physical Review B (Condensed Matter and Materials Physics) 73(20).
Abstract
Transport measurements are presented on a quantum ring that is tunnel-coupled to a quantum dot. When the dot is in the Coulomb blockade regime, but strongly coupled to the open ring, Fano line shapes are observed in the current through the ring, when the electron number in the dot changes by 1. The symmetry of the Fano resonances is found to depend on the magnetic flux penetrating the area of the ring and on the strength of the ring-dot coupling. At temperatures above T=0.65 K the Fano effect disappears, while the Aharonov-Bohm interference in the ring persists up to T=4.2 K. Good agreement is found between these experimental observations and a single-channel scattering matrix model including decoherence in the dot.
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B (Condensed Matter and Materials Physics)
volume
73
issue
20
publisher
American Physical Society
external identifiers
  • wos:000237950500062
  • scopus:33646557688
ISSN
1098-0121
DOI
10.1103/PhysRevB.73.205326
language
English
LU publication?
yes
id
999254a6-3a9d-4292-9f0f-73c4f90cf91a (old id 407351)
date added to LUP
2007-10-03 08:02:58
date last changed
2019-05-14 03:07:14
@article{999254a6-3a9d-4292-9f0f-73c4f90cf91a,
  abstract     = {Transport measurements are presented on a quantum ring that is tunnel-coupled to a quantum dot. When the dot is in the Coulomb blockade regime, but strongly coupled to the open ring, Fano line shapes are observed in the current through the ring, when the electron number in the dot changes by 1. The symmetry of the Fano resonances is found to depend on the magnetic flux penetrating the area of the ring and on the strength of the ring-dot coupling. At temperatures above T=0.65 K the Fano effect disappears, while the Aharonov-Bohm interference in the ring persists up to T=4.2 K. Good agreement is found between these experimental observations and a single-channel scattering matrix model including decoherence in the dot.},
  articleno    = {205326},
  author       = {Fuhrer, Andreas and Brusheim, Patrik and Ihn, T and Sigrist, M and Ensslin, K and Wegscheider, W and Bichler, M},
  issn         = {1098-0121},
  language     = {eng},
  number       = {20},
  publisher    = {American Physical Society},
  series       = {Physical Review B (Condensed Matter and Materials Physics)},
  title        = {Fano effect in a quantum-ring-quantum-dot system with tunable coupling},
  url          = {http://dx.doi.org/10.1103/PhysRevB.73.205326},
  volume       = {73},
  year         = {2006},
}