Spin droplets in confined quantum Hall systems

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DOIResolve DOI: http://doi.org/10.1103/PhysRevB.77.041302
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TypeArticle
Journal titlePhysical Review B
Volume77
Issue4
Pages041302
AbstractTwo-dimensional semiconductor quantum dots are studied in the filling-factor range 2<ν<3. We find both theoretical and experimental evidence of a collective many-body phenomenon, where a fraction of the trapped electrons form an incompressible spin droplet on the highest occupied Landau level. The phenomenon occurs only when the number of electrons in the quantum dot is larger than ∼30. We find the onset of the spin-droplet regime at ν=5∕2. This proposes a finite-geometry alternative to the Moore-Read-type Pfaffian state of the bulk two-dimensional electron gas. Hence, the spin-droplet formation may be related to the observed fragility of the ν=5∕2 quantum Hall state in narrow quantum point contacts.
Publication date
AffiliationNRC Institute for Microstructural Sciences; National Research Council Canada
Peer reviewedNo
NPARC number12744476
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Record identifier261aee71-e415-4bdd-9d93-49978fbca4d6
Record created2009-10-27
Record modified2016-05-09
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