An adaptive algorithm for n-body field expansions
Weinberg, Martin D.
1998-05-28
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Pinning of magnetic-field induced Wigner molecules (WMs) confined in
parabolic two-dimensional quantum dots by a charged defect is studied by an
exact diagonalization approach. We found a re-entrant pinning of the WMs as
function of the magnetic field, a magnetic field induced re-orientation of the
WMs and a qualitatively different pinning behaviour in the presence of a
positive and negative Coulomb impurity.
Comment: 18 pages, 16 figures, accepted for publication in PRB
Using three-dimensional k.p calculation including strain and
piezoelectricity, we showed that the size of the quantum dot (QD) in the growth
direction determines the influence of the (In,Ga)As capping layer on the
optical properties of [11k] grown InAs QDs, where k=1,2,3. For flat dots,
increase of In concentration in the capping layer leads to a decrease of the
transition energy, as is the case of [001] grown QDs, whereas for large dots an
increase of the In concentration in the capping layer is followed by an
increase of the transition energy up to a critical concentration of In, after
which the optical transition energy starts to decrease.
Comment: 8 pages, 10 figures
Comment: 4 pages, 4 figures
Comment: 7 pages, 7 figures
Comment: 4 Physical Review style pages, 4 eps figures embedded, uses REVTeX 4
and graphicx package
Comment: 10 double-column pages, 6 eps figures embedded, uses ReVTEX4 graphicx
package
