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Spin‐ and charge‐density excitations in quantum dots via Quantum Monte Carlo simulation
Author(s) -
Colletti Leonardo,
Pederiva Francesco,
Lipparini Enrico,
Umrigar Cyrus J.
Publication year - 2007
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200674605
Subject(s) - quantum monte carlo , monte carlo method , polarizability , diffusion monte carlo , physics , statistical physics , dynamic monte carlo method , excitation , variational monte carlo , monte carlo molecular modeling , spin (aerodynamics) , quantum dot , quantum , monte carlo method in statistical physics , computational physics , quantum mechanics , hybrid monte carlo , markov chain monte carlo , mathematics , molecule , statistics , thermodynamics
The calculation of the polarizability provides a method of calculating the collective‐modes excitation energies of an electronic system. However, the polarizability is a correlated quantity, thus demanding a major effort when Monte Carlo methods are used for its evaluation. Nevertheless, Quantum Monte Carlo results represent the benchmark in most many‐body physics. We applied a correlated Variational and Diffusion Monte Carlo scheme to a GaAs–AlGaAs quantum dot. Comparison with Raman scattering experiments and previous calculations is considerable. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)