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- W2034861830 abstract "In order to satisfy the limitless requirement for miniaturizing and speeding up electronic devices, development of femtosecond–angstrom technology has been proposed to be a helpful solution and is gathering attention. The technology combines ultrashort-pulsed lasers and scanning tunneling microscopy (STM) to realize a measurement technique which has both extremely high temporal and spatial resolutions. Among several setups proposed for realizing such measurements, 1–10,12) pulse-pair-excited STM (PPXSTM) has recently made a significant stride by introducing the delay-time-modulation method, 8–10,12) in which the tunnel gap of an STM apparatus is illuminated by a sequence of ultrashort laser pulse pairs and the variation in tunnel current is measured as a function of the delay time between the two pulses in each pulse pair. As a result, picosecond-order ultrafast response in tunnel current was successfully detected for a low-temperature-grown GaN� As1� � sample. As already pointed out, 9,10) however, the analysis of the time-resolved tunnel current signal obtained by PPX-STM is very complex. This is because the obtained time-resolved tunnel current signal does not exactly correspond to the ultrafast variation in tunnel current caused by the laser illumination. Instead, it represents the variation in the temporarily averaged tunnel current as a function of delay time. The dependence of tunnel current on delay time generally involves complex physical processes. The detailed physical processes that occur in a sample must be understood to extract the ultrafast physical property of the sample from the obtained signal. This paper aims to clarify a basic concept for the analysis of time-resolved tunnel current obtained by PPX-STM, where the nonlinear response of the tunnel current to the light illumination in the sample plays a major role. Finally, the experimentally obtained data is interpreted along with the discussion." @default.
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- W2034861830 date "2006-03-30" @default.
- W2034861830 modified "2023-09-23" @default.
- W2034861830 title "Nonlinear Dependences in Pulse-Pair-Excited Scanning Tunneling Microscopy" @default.
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