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Issue 19, 2013
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Bases for time-resolved probing of transient carrier dynamics by optical pump–probe scanning tunneling microscopy

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Abstract

The tangled mechanism that produces optical pump–probe scanning tunneling microscopy spectra from semiconductors was analyzed by comparing model simulation data with experimental data. The nonlinearities reflected in the spectra, namely, the excitations generated by paired laser pulses with a delay time, the logarithmic relationship between carrier density and surface photovoltage (SPV), and the effect of the change in tunneling barrier height depending on SPV, were examined along with the delay-time-dependent integration process used in measurement. The optimum conditions required to realize reliable measurement, as well as the validity of the microscopy technique, were demonstrated for the first time.

Graphical abstract: Bases for time-resolved probing of transient carrier dynamics by optical pump–probe scanning tunneling microscopy

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Publication details

The article was received on 11 May 2013, accepted on 09 Jul 2013 and first published on 11 Jul 2013


Article type: Paper
DOI: 10.1039/C3NR02433D
Citation: Nanoscale, 2013,5, 9170-9175
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    Bases for time-resolved probing of transient carrier dynamics by optical pump–probe scanning tunneling microscopy

    M. Yokota, S. Yoshida, Y. Mera, O. Takeuchi, H. Oigawa and H. Shigekawa, Nanoscale, 2013, 5, 9170
    DOI: 10.1039/C3NR02433D

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