Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 73: Low-Dimensional Systems: Topological Order

TT 73.11: Vortrag

Donnerstag, 10. März 2016, 18:00–18:15, H19

Gate-tunable Andreev bound states in InSb Nanowire Josephson junction — •Ning Kang¹, Sen Li¹, Dingxun Fan¹, Philippe Caroff², and Hongqi Xu¹ — ¹Key Laboratory for the Physics and Chemistry of Nanodevices, Department of Electronics, Peking University, Beijing 100871, P. R. China. — ²Division of Solid State Physics, Lund University, P. O. Box 118, S-221 00 Lund, Sweden

Hybrid InSb nanowire-superconductor devices are promising candidates for investigating Majorana modes in solid-state devices and future technologies of topological quantum manipulation. Here, we report low-temperature transport measurements on an individual InSb nanowire quantum dot coupled to superconducting contacts that exhibit an interplay between the Kondo effects and uperconductivity. We observed two types of subgap resonance states within the superconudcting gap, which can be attributed to gate-tunable Andreev bound states in Coulomb valleys with different Kondo temperatures. The presence of the gate-tunable 0 and pijunction allow us to invetigate the fundamental 0- pi transition. Detailed magnetic field and temperature evolution of level spectroscopy demonstrate different behavior of two types of the Andreev bound states. Our results exhibit that the InSb nanowires can provide a promising platform for exploring phase coherence transport and the effect of spin-orbit couping in semiconductor nanowire-superconductor hybird device.