7 March 2014 Imaging ultrafast dynamics on the nanoscale with a THz-STM
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Abstract
We detail a new ultrafast scanning tunneling microscopy technique called THz-STM that uses terahertz (THz) pulses coupled to the tip of a scanning tunneling microscope (STM) to directly modulate the STM bias voltage over subpicosecond time scales [1]. In doing so, THz-STM achieves ultrafast time resolution via a mode complementary to normal STM operation, thus providing a general ultrafast probe for stroboscopic pump-probe measurements. We use THz-STM to image ultrafast carrier trapping into a single InAs nanodot and demonstrate simultaneous nanometer (2 nm) spatial resolution and subpicosecond (500 fs) temporal resolution in ambient conditions. Extending THz-STM to vacuum and low temperature operation has the potential to enable studies of a wide variety of subpicosecond dynamics on materials with atomic resolution.
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Tyler L. Cocker, Vedran Jelic, James R. Hoffman, Manisha Gupta, Reginald Miller, Sean J. Molesky, Jacob A. J. Burgess, Glenda De Los Reyes, Lyubov V. Titova, Ying Y. Tsui, Mark R. Freeman, Frank A. Hegmann, "Imaging ultrafast dynamics on the nanoscale with a THz-STM", Proc. SPIE 8984, Ultrafast Phenomena and Nanophotonics XVIII, 898411 (7 March 2014); doi: 10.1117/12.2037447; https://doi.org/10.1117/12.2037447
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