Localization in an Inhomogeneous Quantum Wire

Details Localization in an Inhomogeneous Quantum Wire Localization in an Inhomogeneous Quantum Wire

2008-07-27

arxiv.org/abs/0807.4292v3

Phys. Rev. B 80, 201302(R) (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages; 2 new figures, substantial revisions and clarifications

Scientific paper

10.1103/PhysRevB.80.201302

We study interaction-induced localization of electrons in an inhomogeneous quasi-one-dimensional system--a wire with two regions, one at low density and the other high. Quantum Monte Carlo techniques are used to treat the strong Coulomb interactions in the low density region, where localization of electrons occurs. The nature of the transition from high to low density depends on the density gradient--if it is steep, a barrier develops between the two regions, causing Coulomb blockade effects. Ferromagnetic spin polarization does not appear for any parameters studied. The picture emerging here is in good agreement with measurements of tunneling between two wires.

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