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Probing subpicosecond dynamics using pulsed laser combined scanning tunneling microscopy

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9 Author(s)
Takeuchi, Osamu ; Institute of Applied Physics, 21st COE, NANO Project, University of Tsukuba, Tsukuba 305-8573, Japan ; Aoyama, Masahiro ; Oshima, R. ; Okada, Yoshitaka
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Time-resolved tunneling current measurement in the subpicosecond range was realized by ultrashort-pulse laser combined scanning tunneling microscopy, using the shaken-pulse-pair method. A low-temperature-grown GaNxAs1-x (x=0.36%) sample exhibited two ultrafast transient processes in the time-resolved tunnel current signal, whose lifetimes were determined to be 0.653±0.025 and 55.1±5.0 ps. These values are of the same order of magnitude as those measured in the conventional pump–probe reflectivity measurement.

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Applied Physics Letters  (Volume:85 ,  Issue: 15 )