Two-electron quantum dot molecule: Composite particles and the spin phase diagram

A. Harju, S. Siljamäki, R.M. Nieminen

Research output: Contribution to journalArticleScientificpeer-review

96 Citations (Scopus)
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We study a two-electron quantum dot molecule in a magnetic field by the direct diagonalization of the Hamiltonian matrix. The ground states of the molecule with the total spin S=0 and S=1 provide a possible realization for a qubit of a quantum computer. Switching between the states is best achieved by changing the magnetic field. Based on an analysis of the wave function, we show that the system consists of composite particles formed by an electron and flux quanta attached to it. This picture can also be used to explain the spin phase diagram.
Original languageEnglish
Article number226804
Pages (from-to)1-4
JournalPhysical Review Letters
Issue number22
Publication statusPublished - 2002
MoE publication typeA1 Journal article-refereed


  • composite particle
  • exact diagonalization
  • quantum dot molecule


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