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TT: Tiefe Temperaturen

TT 5: Transport: Nanoelectronics I - Quantum Dots, Wires, Point Contacts - Part 1

TT 5.2: Talk

Monday, March 27, 2006, 10:00–10:15, HSZ 304

Two-electron entanglement in double quantum dots with Coulomb and spin-orbit interaction — •S. Weiss, M. Thorwart, and R. Egger — Heinrich-Heine Universität Düsseldorf

We investigate the entanglement of two-particle electronic charge states in vertical double quantum dots in presence of the Coulomb and spin-orbit interaction. Upon using exact diagonalization, the spectrum and the eigenvectors of the Hamiltonian are obtained as a function of all the model parameters. The entanglement is quantified in terms of the Peres-Horodecki measure which follows immediately from the density operator of the system. Interestingly enough, we find a non-monotonous dependence of the entanglement on the Coulomb interaction strength. Depending on the tunneling amplitude between the two dots, we even find a suppression of the entanglement for large Coulomb interaction and for intermediate tunneling couplings. This counterintuitive behavior can be explained by the confinement of the electrons in the dots.

[1] S.Weiss, M. Thorwart and R. Egger, submitted.