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Magnetic field influence on spectrum rearrangement and spin transformation of coupled quantum dots

N E Kaputkina1 and Yu E Lozovik2

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Two-electron systems consisting of two laterally or vertically coupled quantum dots (QDs) are considered. Their behaviour in external magnetic field is studied. Ground state energies and energy spectra were obtained taking into account interelectron interaction for a wide range of values of confining potential steepness (α), distance between QDs (d), and external magnetic field (B). The spontaneous magnetization and the singlet–triplet transformation of the QD molecule ground state controlled by the magnetic field are studied.


PACS

73.21.La Quantum dots

75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects

75.75.+a Magnetic properties of nanostructures

Subjects

Condensed matter: electrical, magnetic and optical

Surfaces, interfaces and thin films

Nanoscale science and low-D systems

Dates

Issue 33 (23 August 2006)

Received 16 January 2006, in final form 8 June 2006

Published 4 August 2006



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