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Anisotropic photoconductivity of quantum dot chains measured by terahertz pulse spectroscopy
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) TEM image of QD sample surface morphology. THz polarization parallel and perpendicular to the dot chains is indicated. (b) Schematic diagram of the sample (not to scale) showing arrangement of QDs on 1D WLs.

Image of FIG. 2.
FIG. 2.

Normalized transient differential THz transmission, , at for the THz polarization and to the dot chains. The sample was excited with pump pulses with a fluence of . The transient response from a SI sample is shown for comparison.

Image of FIG. 3.
FIG. 3.

(a) Normalized for the THz polarization to the dot chains at three different temperatures, and (b) amplitudes of the fast and slow components. (c) Normalized for the orientation at three temperatures, and (d) corresponding component amplitudes. The pump fluence was held at for all temperatures.

Image of FIG. 4.
FIG. 4.

scans for the (a) and (b) orientations at for the fluences listed. (c) Dependence of the amplitude of the slow component with photoexcited carrier density for each polarization orientation at .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Anisotropic photoconductivity of InGaAs quantum dot chains measured by terahertz pulse spectroscopy