Magnetic Moment Formation in Quantum Point Contacts

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dc.creatorCornaglia, P. S.
dc.creatorBalseiro, C. A.
dc.creatorAvignon, M.
dc.date2004-11-02
dc.date.accessioned2026-07-07T03:01:50Z
dc.date.available2026-07-07T03:01:50Z
dc.descriptionWe study the formation of local magnetic moments in quantum point contacts. Using a Hubbard-like model to describe point contacts formed in a two dimensional system, we calculate the magnetic moment using the unrestricted Hartree approximation. We analyze different type of potentials to define the point contact, for a simple square potential we calculate a phase diagram in the parameter space (Coulomb repulsion - gate voltage). We also present an analytical calculation of the susceptibility to give explicit conditions for the occurrence of a local moment, we present a simple scaling argument to analyze how the stability of the magnetic moment depends on the point contact dimensions.
dc.description7 pages, 2 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0411053
dc.identifierhttp://arxiv.org/abs/cond-mat/0411053
dc.identifierPhys. Rev. B 71, 024432 (2005)
dc.identifierdoi:10.1103/PhysRevB.71.024432
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/25194
dc.subjectMesoscale and Nanoscale Physics
dc.subjectStrongly Correlated Electrons
dc.titleMagnetic Moment Formation in Quantum Point Contacts
dc.typetext

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