Dynamic response of artificial bipolar molecules

Details Dynamic response of artificial bipolar molecules Dynamic response of artificial bipolar molecules

2002-03-27

arxiv.org/abs/cond-mat/0203562v1

Phys. Rev. B 66, 075311 (2002)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 double-column pages, 6 eps figures embedded, uses ReVTEX4 graphicx package

Scientific paper

10.1103/PhysRevB.66.075311

We calculate the equilibrium properties and the dynamic response of two vertically coupled circular quantum dots populated by particles of different electrical charge sign, i.e. electrons and holes. The equilibrium density profiles are obtained and used to compute the frequencies and oscillator strengths of magnetoplasma excitations. We find a strong coupling between the modes derived from the center-of-mass modes of the individual dots which leads to an anticrossing with a pronounced oscillator strength transfer from the ``acoustic'' to the ``optical'' branch. Also, due to breaking of the generalized Kohn theorem a number of other than center-of-mass modes are excited whose oscillator strengths, however, are rather weak.

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