Regensburg 2016 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 16: Transport: Quantum Dots, Quantum Wires, Point Contacts

TT 16.10: Vortrag

Montag, 7. März 2016, 17:30–17:45, H21

Transport through strongly correlated Hubbard chains — •Junichi Ozaki and Yoshihiro Asai — AIST, Tsukuba, Japan

Strong correlation effect on the electric conductance of a wire at zero bias voltage was discussed a lot in the literatures mostly a decade ago by using the Luttinger model and/or some numerical methods. In some cases, the finite size effect of the single chain is not taken into account very well. Moreover, the effect of the thermalized Landauer*s electrode has not been taken into account quite unfortunately. Here, we put our priorities on these unresolved problems in discussing the strong correlation effect on the charge transport. The electric current in the strong correlation regime under the finite bias voltage is investigated in terms of a finite length single chain Hubbard model connected to non-interacting electrodes. The on-site Coulomb repulsion and the length are the variables. We use the time-dependent density matrix renormalization group (t-DMRG), which describes the many-body electron dynamics accurately. The zero-bias conductance and the current versus voltage (I-V) characteristics are examined at zero temperature. The conductance oscillation as a function of the length accompanies a damping. The non-linear behavior due to the strong correlation effect is found in the I-V curve. In the both cases, inelastic contribution from the Coulomb repulsion is clear in the strong correlation regime.