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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/10869

Title: Selective observation of local carrier dynamics at step bunches on vicinal TiO_2(110) by time-resolved pump-probe second harmonic generation method
Authors: Takahashi, Hiroaki
Miyauchi, Yoshihiro
Mizutani, Goro
Keywords: step-selective
time-resolved second harmonic generation (SHG)
vicinal TiO2
step bunch
local carrier dynamics
Issue Date: 2012-07-26
Publisher: American Physical Society
Magazine name: Physical Review B
Volume: 86
Number: 4
Start page: 045447-1
End page: 045447-13
DOI: 10.1103/PhysRevB.86.045447
Abstract: We report on a step-selective time-resolved second harmonic generation (SHG) method using vicinal TiO_2 (110) with regularly aligned step bunches. The step selectivity was realized by taking advantage of the symmetry-selective properties of second order nonlinear optical processes. In the time-resolved pump-probe SHG measurement, the step bunches displayed a unique temporal response or a sharp spike decaying within ~100 ps, while no decay kinetics was observed for the (110) terraces within a nanosecond. The observed unique local dynamics at the step bunches was attributed to a transient change in their local carrier density. This carrier density change at the step bunches was discussed from the aspect of their local density of states (LDOS) by using step-selective second harmonic and sum frequency generation (SHG/SFG) spectroscopy and density functional theory (DFT) calculation.
Rights: Hiroaki Takahashi, Yoshihiro Miyauchi, and Goro Mizutani, Physical Review B, 86(4), 2012, 045447-1-045447-13. Copyright 2012 by the American Physical Society. http://dx.doi.org/10.1103/PhysRevB.86.045447
URI: http://hdl.handle.net/10119/10869
Material Type: publisher
Appears in Collections:c10-1. 雑誌掲載論文 (Journal Articles)

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