Hartree-Fock studies of quantum dots and the 0.7 anomaly |
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Authors: | C Sloggett OP Sushkov |
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Institution: | School of Physics, University of New South Wales, Sydney 2052, Australia |
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Abstract: | We apply unrestricted Hartree-Fock to modelling two systems:- (1)
- We calculate the spin structure and addition spectra of small symmetric quantum dots (often called 2D “artificial atoms”), improving the accuracy considerably by including, for the first time, second-order correlation corrections. We compare the results to experiment and to previous numerical works, and find that our spin structure in some cases disagrees with that calculated within mean-field theories, such as Hartree-Fock without correlation corrections, or density-functional theory C. Sloggett, O.P. Sushkov, Phys. Rev. B 71 (2005) 235326].
- (2)
- We model the well-known 0.7 anomaly in the conductance of a quantum point contact. We calculate the conductance using direct calculation of scattering phases on a ring, within Hartree-Fock. We observe strong localisation of the Fermi electrons on the barrier, and suggest a mechanism for the observed temperature-dependent conductance anomaly.
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Keywords: | Computer simulations Electron transport Quantum confinement Spin-dependent phenomena Quantum wells Nanostructures |
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