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TT: Fachverband Tiefe Temperaturen

TT 8: Transport: Quantum Dots, Wires, Point Contacts 1 (jointly with HL and O)

TT 8.4: Vortrag

Montag, 11. März 2013, 10:15–10:30, H20

Transport through two interacting resonant levels connected by a Fermi sea — •Elena Canovi, Alexander Moreno, and Alejandro Muramatsu — Institut für Theoretische Physik III, Universität Stuttgart

We study transport at finite bias, i.e. beyond the linear regime, through two interacting resonant levels connected by a Fermi sea. Our results are obtained by means of time-dependent density matrix renormalization group. We find that at finite size both the current and the occupations of the interacting levels oscillate as a function of time. We determine the amplitude and period of such oscillations as a function of bias and extension of the Fermi sea. In particular, the occupations on the two dots oscillate with a relative phase which depends on the distance between the impurities and on the Fermi momentum of the Fermi sea, as expected for RKKY interactions. The approximant to the steady-state current displays oscillations as a function of the distance between the impurities. In the free case we find that it is affected by resonances. The latter can be understood by considering the transmission coefficient of one particle propagating freely in the system. We discuss finally the incidence of interaction on such a behavior.