For low biases the linear conductance of quantum dots is based on elastic transport processes. At finite bias in the Coulomb blockade regime, inelastic cotunneling sets in once the applied bias exceeds the energy between ground and excited state in the dot. Here we report on transport experiments through an Aharonov-Bohm ring containing a quantum dot in each arm of the ring. The tunnel coupling between the two dots can be tuned by electrostatic gates. For strong tunnel coupling and low bias we observe pronounced Aharonov-Bohm oscillations in the ring with visibilities exceeding 80%. For quantum dots which are purely capacitively coupled, the Aharonov-Bohm amplitude is reduced to a more standard 10%. For finite bias, where transport through excited states becomes possible and a conductance onset is observed, the visibility of the Aharonov-Bohm oscillations remains basically unchanged, while the phase typically undergoes a change of . We discuss these observations in view of the possible elastic and inelastic transport processes and their contributions to coherent transport.
Skip Nav Destination
Article navigation
15 April 2007
Research Article|
April 27 2007
Is inelastic cotunneling phase coherent?a) Available to Purchase
M. Sigrist;
M. Sigrist
Solid State Physics Laboratory,
ETH Zurich
, 8093 Zurich, Switzerland
Search for other works by this author on:
T. Ihn;
T. Ihn
Solid State Physics Laboratory,
ETH Zurich
, 8093 Zurich, Switzerland
Search for other works by this author on:
K. Ensslin;
K. Ensslin
b)
Solid State Physics Laboratory,
ETH Zurich
, 8093 Zurich, Switzerland
Search for other works by this author on:
M. Reinwald;
M. Reinwald
Institut für Experimentelle und Angewandte Physik,
Universität Regensburg
, Regensburg, Germany
Search for other works by this author on:
W. Wegscheider
W. Wegscheider
Institut für Experimentelle und Angewandte Physik,
Universität Regensburg
, Regensburg, Germany
Search for other works by this author on:
M. Sigrist
Solid State Physics Laboratory,
ETH Zurich
, 8093 Zurich, Switzerland
T. Ihn
Solid State Physics Laboratory,
ETH Zurich
, 8093 Zurich, Switzerland
K. Ensslin
b)
Solid State Physics Laboratory,
ETH Zurich
, 8093 Zurich, Switzerland
M. Reinwald
Institut für Experimentelle und Angewandte Physik,
Universität Regensburg
, Regensburg, Germany
W. Wegscheider
Institut für Experimentelle und Angewandte Physik,
Universität Regensburg
, Regensburg, Germanyb)
Electronic mail: [email protected]
a)
This paper is based on a talk presented by the authors at the 28th International Conference on the Physics of Semiconductors, which was held 24–28 July 2006, in Vienna, Austria. Contributed papers for that conference may be found in “Physics of Semiconductors: 28th International Conference on the Physics of Semiconductors,” AIP Conference Proceedings No. 893 (AIP, Melville, NY, 2007); see http://proceedings.aip.org/proceedings/confproceed/893.jsp
J. Appl. Phys. 101, 081701 (2007)
Article history
Received:
August 03 2006
Accepted:
January 21 2007
Citation
M. Sigrist, T. Ihn, K. Ensslin, M. Reinwald, W. Wegscheider; Is inelastic cotunneling phase coherent?. J. Appl. Phys. 15 April 2007; 101 (8): 081701. https://doi.org/10.1063/1.2722725
Download citation file:
Pay-Per-View Access
$40.00
Sign In
You could not be signed in. Please check your credentials and make sure you have an active account and try again.
Citing articles via
A step-by-step guide to perform x-ray photoelectron spectroscopy
Grzegorz Greczynski, Lars Hultman
Tutorial: Simulating modern magnetic material systems in mumax3
Jonas J. Joos, Pedram Bassirian, et al.
Piezoelectric thin films and their applications in MEMS: A review
Jinpeng Liu, Hua Tan, et al.
Related Content
Cotunneling assisted sequential tunneling in multilevel quantum dots
Appl. Phys. Lett. (May 2008)
Inelastic cotunneling in the Coulomb-blockade transport of donor-atom transistors
J. Vac. Sci. Technol. B (January 2023)
Inelastic cotunneling with energy-dependent contact transmission
J. Chem. Phys. (February 2017)
Microscopic theory of electron cotunneling through quantum dots
J. Appl. Phys. (August 2010)
Ferromagnetic Lead Effects on Inelastic Cotunneling Current and Shot Noise of an Interacting Quantum Dot
AIP Conf. Proc. (April 2007)