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- Lozovik, Yu E, et al.
(författare)
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Crystallization and quantum melting of few electron system in a spherical quantum dot : quantum Monte Carlo simulation
- 2003
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Ingår i: Solid State Communications. - : Elsevier Science B.V., Amsterdam.. - 0038-1098 .- 1879-2766. ; 125:2, s. 127-131
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Tidskriftsartikel (refereegranskat)abstract
- Spherical quantum dots with a few charged Fermi particles (electrons or holes) are studied for different total spins. Simulation by quantum path integral Monte Carlo method is performed. The dependence of the electron correlations in the quantum dot is studied at different mean interelectron separation controlled by number of electrons in the quantum dot and by steepness of electron confinement (the latter parameter can be changed by the gate voltage). The cold melting-quantum transition from Wigner crystal-like state (i.e. from regime of strongly correlated electrons) to a Ferad liquid-like state-driven by the steepness of electron confinement is studied. The pair correlation function and radial function characterizing electron quantum delocalization are analyzed.
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| 2. |
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| 3. |
- Lozovik, Yu E, et al.
(författare)
-
Structural properties of the condensate in two-dimensional mesoscopic systems of strongly correlated excitons
- 2004
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Ingår i: JETP Letters. - : Springer Science Business Media. - 0021-3640 .- 1090-6487. ; 79:10, s. 473-478
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Tidskriftsartikel (refereegranskat)abstract
- A two-dimensional mesoscopic Bose system of dipoles in a 2D trap is considered using computer simulation by the quantum path-integral Monte Carlo method. The model describes a rarefied system of spatially indirect excitons in a confining potential. Bose condensation in the system and its superfluid and structural properties are studied over a wide range of interparticle spatial correlations, from an almost ideal Bose gas to the regime of a strongly correlated system. It is found that, at strong interparticle spatial correlations, particles in the condensate form a crystal-like structure. In this case, the spatial correlations of particles in the condensate are less pronounced than the correlations of noncondensed particles. The effect of recurrent crystallization is observed in the regime of strong interparticle correlations.
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