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HL: Halbleiterphysik

HL 39: Quantenpunkte und -dr
ähte: Transporteigenschaften I

HL 39.1: Vortrag

Montag, 7. März 2005, 10:00–10:15, TU P-N202

Nonmonotonic charge occupation in double dots — •Jürgen König¹ and Yuval Gefen² — ¹Institut für Theoretische Physik III, Ruhr-Universität Bochum, 44780 Bochum, Germany — ²Department of Condensed Matter Physics, The Weizmann Institute of Science, 76100 Rehovot, Israel

We study the occupation of two electrostatically-coupled single-level quantum dots with spinless electrons as a function of gate voltage. While the total occupation of the double-dot system varies monotonically with gate voltage, we predict that the competition between tunneling and Coulomb interaction can give rise to a nonmonotonic filling of the individual quantum dots. This non-monotonicity is a signature of the correlated nature of the many-body wavefunction in the reduced Hilbert space of the dots. We identify two mechanisms for this nonmonotonic behavior, which are associated with changes in the spectral weights and the positions, respectively, of the excitation spectra of the individual quantum dots. An experimental setup to test these predictions is proposed.

[1] J. König and Y. Gefen, cond-mat/0408691.