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TT: Fachverband Tiefe Temperaturen

TT 12: Transport: Nanoelectronics I - Quantum Dots, Wires, Point Contacts 2

TT 12.4: Vortrag

Montag, 26. März 2012, 15:45–16:00, BH 334

DMRG study of transport in quantum dots out of equilibrium — •Elena Canovi, Alexander Moreno, and Alejandro Muramatsu — Institut fuer Theoretische Physik III, Pfaffenwaldring 57, 70550 Stuttgart

We study electrical transport in quantum dots (QD) out of equilibrium by means of the Density Matrix Renormalization Group (DMRG). This method allows to go beyond linear response theory, i.e. to deal with a finite bias, and to handle large interactions. We concentrate on charge fluctuations in QDs and study the interacting resonant level model (IRLM) which describes spinless fermions. The quantum dots are connected to two fermionic reservoirs, modeled as tight-binding chains. We first study the one-impurity case. We benchmark the correctness of our code against known results for the I-V characteristics, study particle-hole symmetry breaking interactions and the case of generic fillings. We then switch to the case of two impurities, for which we show some new results.