Magnetic Moment Formation in Quantum Point Contacts

Details Magnetic Moment Formation in Quantum Point Contacts Magnetic Moment Formation in Quantum Point Contacts

2004-11-02

arxiv.org/abs/cond-mat/0411053v1

Phys. Rev. B 71, 024432 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 2 figures

Scientific paper

10.1103/PhysRevB.71.024432

We 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.

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