Dresden 2017 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 63: Poster: Quantum Dots and Optics

HL 63.56: Poster

Mittwoch, 22. März 2017, 15:00–19:00, P1A

Capacitance calculations for charge detection in indium arsenide nanowires — •Felix Jekat¹, Moritz Sallermann¹, Sebastian Heedt², Patrick Zellekens³, Stefan Trellenkamp⁴, Werner Prost⁵, Marcus Liebmann¹, and Markus Morgenstern¹ — ¹II. Institute of Physics B, RWTH Aachen — ²Qutech, Kouwenhoven Lab, TU Delft — ³PGI-9, Forschungszentrum Jülich, Germany — ⁴PGI-8, Forschungszentrum Jülich, Germany — ⁵Center for Semiconductor Technology and Optoelectronics, University of Duisburg-Essen

Indium arsenide (InAs) nanowires have been shown to be suitable as tips for scanning tunneling microscopy (STM) with similar quality compared to tungsten tips [1]. We present a device with the goal to enable time-resolved counting of single electrons directly at these InAs nanowire STM tips. To realize electron counting in the nanowire tip we place a second nanowire in close proximity and couple the two wires with a floating gate [2]. In order to determine the sensitivity of this setup we preformed capacitance calculation using Comsol Multiphysics. The results show that the sensitivity is high enough to detect individual electrons in the Quantum Dot of the nanowire STM tip.

[1] K. Flöhr et al. "Scanning tunneling microscopy with InAs nanowire tips", Appl. Phys. Lett. 101, 243101 (2012)

[2] Y. Hu et al. "A Ge/Si heterostructure nanowire-based double quantum dot with integrated charge sensor", Nature Nanotechnol. 2, 622 (2007)