Dresden 2009 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 17: Quantum wires: Optical and transport properties
HL 17.8: Vortrag
Dienstag, 24. März 2009, 12:15–12:30, BEY 154
Phase-coherent transport in InN nanowires: Analysis by four-terminal measurements — •Robert Frielinghaus1,2, Sergio Estévez Hernández1,2, Raffaella Calarco1,2, Stefan Trellenkamp1,2, Thomas Schäpers1,2, and Detlev Grützmacher1,2 — 1Institute of Bio- and Nanosystems (IBN-1), Research Centre Jülich, 52425 Jülich, Germany — 2JARA-Fundamentals of Future Information Technology
Bottom-up assembled nanowires receive an increasing interest as possible candidates for future semiconductor nanoscale devices. Especially InN nanowires are interesting due to their surface accumulation layer which inhibits Schottky barriers [1]. Yet, contact resistances prove to be spread in a wide range as can be shown in multi-terminal measurements.
At low temperatures phase-coherence leads to universal conductance fluctuations in the magnetoconductance. While they are fully symmetric in a two-terminal setup this feature is gradually lost when turning to three- or four-terminal measurements. Using the latter configuration the temperature dependence of the electron phase-coherence in the nanowire itself can be determined, i.e. without any contact resistance contribution.
[1] Th. Richter et al.: Nano Letters 8, 2834 (2008)