Objective
Our project aims at observing the spatial modulations of local electron probability density along a quantum ring fabricated from a two-dimensional electron gas (2DEG) formed in an InGaAs heterostructure. As a magnetic field is applied perpendicular to the plane of such a ring, a periodic pattern of maxima and minima of electron probability density is predicted to appear, due to interferences of electron partial waves inside the ring (these interferences give rise to the well-known Aharonov-Bohm effect, causing periodic oscillations in the ring magneto resistance). In order to observe this phenomenon, we plan to use a low temperature (4.2K) atomic force microscope (AFM) in non-contact mode. A voltage bias will be applied on the tip of the AFM in order to create a local perturbation in the 2DEG underneath.
The principle is to record the changes of conductance of the quantum ring as a function of the tip position (i.e. the perturbation position) over the quantum ring, which will produce images related to the changes of electron probability density (the technique was demonstrated for quantum point contacts in M.A. Topinka et al., Science 289, 2323 (2000)). Using voltages applied on lateral (in-plane) gates patterned close to the quantum ring, we will investigate t he influence of the coupling of the ring to external electron reservoirs as well as the influence of the asymmetry of the ring. The biased scanning tip will also be used as a static scattered on one arm of the ring, and the influence of the position of the tip on Aharonov-Bohm oscillations will be characterized. Potential outcomes of this project are in the field of experimental quantum physics, quantum computation and electron optics.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- natural sciences physical sciences quantum physics
- natural sciences physical sciences optics microscopy
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Keywords
Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Programme(s)
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Topic(s)
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Call for proposal
Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
FP6-2002-MOBILITY-5
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Funding Scheme
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Coordinator
GRENOBLE
France
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.