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Detection of discrete surface charge dynamics in GaAs-based nanowire through metal-tip-induced current fluctuation

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Title: Detection of discrete surface charge dynamics in GaAs-based nanowire through metal-tip-induced current fluctuation
Authors: Sato, Masaki Browse this author
Yin, Xiang Browse this author
Kuroda, Ryota Browse this author
Kasai, Seiya Browse this author →KAKEN DB
Issue Date: Feb-2016
Publisher: IOP Publishing
Journal Title: Japanese Journal of Applied Physics(JJAP)
Volume: 55
Issue: 2S
Start Page: 02BD01
Publisher DOI: 10.7567/JJAP.55.02BD01
Abstract: We investigated the detection of discrete charge dynamics of an electron trap in a GaAs-based nanowire surface through current fluctuation induced by a metallic scanning probe tip. An equivalent circuit model indicated that the charge state in the surface strongly reflects the channel potential when the local surface potential is fixed by the metal tip, which suggests that random charging and discharging dynamics of the trap appears as random telegraph signal (RTS) noise in the nanowire current. Experimental demonstration of the concept was carried out using a GaAs-based nanowire and an atomic force microscope (AFM) system with a conductive tip. We observed the RTS noise in the drain current and superposition of the Lorentzian component in the noise spectrum when the metal tip was in contact with the nanowire surface at specific positions. The obtained results indicate the possibility of detecting charge dynamics of the individual surface trap in semiconductor devices.
Rights: © 2016 The Japan Society of Applied Physics
Type: article (author version)
URI: http://hdl.handle.net/2115/66630
Appears in Collections:量子集積エレクトロニクス研究センター (Research Center for Integrated Quantum Electronics) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 葛西 誠也

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