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Roto-vibrational spectrum and Wigner crystallization in two-electron parabolic quantum dots

AuthorsPuente, Antonio; Serra, Llorenç ; Nazmitdinov, Rashid G.
Keywords[PACS] Quantum dots
[PACS] Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems
Issue Date18-Mar-2004
PublisherAmerican Physical Society
CitationPhysical Review B 69, 125315 (1-9) (2004)
AbstractWe provide a quantitative determination of the crystallization onset for two electrons in a parabolic two-dimensional confinement. This system is shown to be well described by a roto-vibrational model, Wigner crystallization occurring when the rotational motion gets decoupled from the vibrational one. The Wigner molecule thus formed is characterized by its moment of inertia and by the corresponding sequence of rotational excited states. The role of a vertical magnetic field is also considered. Additional support to the analysis is given by the Hartree-Fock phase diagram for the ground state and by the random-phase approximation for the moment of inertia and vibron excitations.
Description9 pages (final publisher version), 10 pages, 8 figures (attached post-print version).-- PACS nrs.: 73.21.La, 73.21.-b.-- Pre-print version available at ArXiv: http://arxiv.org/abs/cond-mat/0308430.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevB.69.125315
Appears in Collections:(IFISC) Artículos
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