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TT: Fachverband Tiefe Temperaturen

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

TT 12.6: Talk

Monday, March 26, 2012, 16:15–16:30, BH 334

Tunneling renormalization of carbon nanotubes cotunneling spectroscopy — •Gediminas Kirsanskas, Karsten Flensberg, and Jens Paaske — Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen Ø, Denmark

We examine the effects of cotunneling threshold renormalization due to the tunneling in carbon nanotube quantum dots in Coulomb blockade regime. It is shown that tunneling can induce gate dependant splitting of fourfold degenerate levels. This results in gate dependant g-factor. We also find that asymmetric tunneling couplings introduce the asymmetry between the positive and negative bias cotunneling thresholds.