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HL: Fachverband Halbleiterphysik

HL 21: Transport: Quantum dots, wires, point contacts 2 (TT, jointly with HL)

HL 21.2: Talk

Monday, March 11, 2013, 15:15–15:30, H18

Kondo Physics in Clean Carbon Nanotubes — •Daniel Schmid, Alois Dirnaichner, Peter Stiller, Andreas K. Hüttel, and Christoph Strunk — Institute for Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany

Clean carbon nanotube quantum dots provide ideal model systems with orbitally degenerate quantum levels to probe novel Kondo physics. Transport measurements on single quantum dots were done down to a base temperature of T≃ 20 mK in the 10≤ N_el≤50 electron regime, showing the typical signatures of the Kondo effect, as well as co-tunneling features at finite bias.
We focus on a specific charge state with N_el=21 electrons in the intermediate coupling regime G_max≃ 0.9(2e²/h). Besides the usual Kondo peak around zero bias voltage (V_SD=0) the differential conductance displays interesting satellites at finite V_SD. These satellites depend only weakly on magnetic field and temperature for the range B<8T and T<1K.