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Externally-triggerable optical pump-probe scanning tunneling microscopy with a time resoloution of tens-picosecond.


ABSTRACT: Photoinduced carrier dynamics of nanostructures play a crucial role in developing novel functionalities in advanced materials. Optical pump-probe scanning tunneling microscopy (OPP-STM) represents distinctive capabilities of real-space imaging of such carrier dynamics with nanoscale spatial resolution. However, combining the advanced technology of ultrafast pulsed lasers with STM for stable time-resolved measurements has remained challenging. The recent OPP-STM system, whose laser-pulse timing is electrically controlled by external triggers, has significantly simplified this combination but limited its application due to nanosecond temporal resolution. Here we report an externally-triggerable OPP-STM system with a temporal resolution in the tens-picosecond range. We also realize the stable laser illumination of the tip-sample junction by placing a position-movable aspheric lens driven by piezo actuators directly on the STM stage and by employing an optical beam stabilization system. We demonstrate the OPP-STM measurements on GaAs(110) surfaces, observing carrier dynamics with a decay time of [Formula: see text] ps and revealing local carrier dynamics at features including a step edge and a nanoscale defect. The stable OPP-STM measurements with the tens-picosecond resolution by the electrical control of laser pulses highlight the potential capabilities of this system for investigating nanoscale carrier dynamics of a wide range of functional materials.

SUBMITTER: Iwaya K 

PROVIDER: S-EPMC9877009 | biostudies-literature | 2023 Jan

REPOSITORIES: biostudies-literature

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Externally-triggerable optical pump-probe scanning tunneling microscopy with a time resoloution of tens-picosecond.

Iwaya Katsuya K   Yokota Munenori M   Hanada Hiroaki H   Mogi Hiroyuki H   Yoshida Shoji S   Takeuchi Osamu O   Miyatake Yutaka Y   Shigekawa Hidemi H  

Scientific reports 20230125 1


Photoinduced carrier dynamics of nanostructures play a crucial role in developing novel functionalities in advanced materials. Optical pump-probe scanning tunneling microscopy (OPP-STM) represents distinctive capabilities of real-space imaging of such carrier dynamics with nanoscale spatial resolution. However, combining the advanced technology of ultrafast pulsed lasers with STM for stable time-resolved measurements has remained challenging. The recent OPP-STM system, whose laser-pulse timing i  ...[more]

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