Download Publication JournalArticle (Originalarbeit in einer wissenschaftlichen

Publication
Fractional quantum Hall effect in a quantum point contact at filling
fraction 5/2
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
ID 170940
Author(s) Miller, Jeffrey B.; Radu, Iuliana P.; Zumbuehl, Dominik M.; Levenson-Falk, Eli M.; Kastner, Marc A.;
Marcus, Charles M.; Pfeiffer, Loren N.; West, Ken W.
Author(s) at UniBasel Zumbühl, Dominik;
Year 2007
Title Fractional quantum Hall effect in a quantum point contact at filling fraction 5/2
Journal Nature physics
Volume 3
Number 8
Pages / Article-Number 561-565
Recent theories suggest that the quasiparticles that populate certain quantum Hall states should exhibit exotic
braiding statistics that could be used to build topological quantum gates. Confined systems that support such
states at a filling fraction nu = 5/2 are of particular interest for testing these predictions. Here, we report
transport measurements of just such a system, which consists of a quantum point contact (QPC) in a twodimensional GaAs/AlGaAs electron gas that itself exhibits a well-developed fractional quantum Hall effect at a
bulk filling fraction nu(bulk) = 5/2. We observe plateau-like features at an effective filling fraction of nu(QPC) =
5/2 for lithographic contact widths of 1.2 mu m and 0.8 mu m, but not 0.5 mu m. Transport near nu(QPC) = 5/2
in the QPCs is consistent with a picture of chiral Luttinger-liquid edge states with inter-edge tunnelling,
suggesting that an incompressible state at nu(QPC) = 5/2 forms in this confined geometry.
Publisher Nature
ISSN/ISBN 1745-2473
edoc-URL http://edoc.unibas.ch/dok/A5262058
Full Text on edoc
No
Digital Object Identifier DOI 10.1038/nphys658
ISI-Number WOS:000249062600020
Document type (ISI) Article