Title :
Imaging ultrafast dynamics on the nanoscale with THz-STM
Author :
V. Jelic;T. L. Cocker;P. H. Nguyen;C. Rathje;G. J. Hornig;J. R. Hoffman;H. M. Sharum;R. Miller;S. J. Molesky;M. Gupta;J. A. J. Burgess;G. B. De los Reyes;L. V. Titova;C. Ropers;Y. Y. Tsui;M. R Freeman;F. A. Hegmann
Author_Institution :
Department of Physics, University of Alberta, Edmonton, AB, T6G 2E1 Canada
Abstract :
The ability to directly image ultrafast phenomena with nanometer spatial resolution is essential to our understanding of local excitation dynamics in nanomaterials and devices. We have developed a new approach to ultrafast scanning tunneling microscopy (STM) that couples terahertz (THz) pulses to the scanning tip of a STM. We have used THz-STM under ambient lab conditions to image ultrafast charging dynamics of a single InAs nanodot on GaAs with 0.5 ps time resolution and 2 nm spatial resolution. We are currently developing THz-STM for operation in ultrahigh vacuum with the goal of imaging ultrafast dynamics on surfaces with atomic resolution.
Keywords :
"Yttrium","Spatial resolution","Microscopy","Tunneling","Nanoscale devices"
Conference_Titel :
Infrared, Millimeter, and Terahertz waves (IRMMW-THz), 2015 40th International Conference on
Electronic_ISBN :
2162-2035
DOI :
10.1109/IRMMW-THz.2015.7327886
