Using 800 nm, 25-fs pulses from a mode locked Ti:Al2O3 laser, we have measured the ultrafast optical reflectivity of MBE-grown, single-layer In0.4Ga0.6As/GaAs quantum-dot (QD) samples. The QDs are formed via two-stage Stranski-Krastanov growth: following initial InGaAs deposition at a relatively low temperature, self assembly of the QDs occurs during a subsequent higher temperature anneal. The capture times for free carriers excited in the surrounding GaAs (barrier layer) are as short as 140 fs, indicating capture efficiencies for the InGaAs quantum layer approaching 1. The capture rates are positively correlated with initial InGaAs thickness and annealing temperature. With increasing excited carrier density, the capture rate decreases; this slowing of the dynamics is attributed to Pauli state blocking within the InGaAs quantum layer.
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28 May 2013
Research Article|
May 31 2013
Carrier capture dynamics of single InGaAs/GaAs quantum-dot layers
K. N. Chauhan;
K. N. Chauhan
1
Physics Department, Utah State University
, Logan, Utah 84322-4415, USA
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D. M. Riffe;
1
Physics Department, Utah State University
, Logan, Utah 84322-4415, USA
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E. A. Everett;
E. A. Everett
1
Physics Department, Utah State University
, Logan, Utah 84322-4415, USA
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D. J. Kim;
D. J. Kim
1
Physics Department, Utah State University
, Logan, Utah 84322-4415, USA
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H. Yang;
1
Physics Department, Utah State University
, Logan, Utah 84322-4415, USA
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F. K. Shen
F. K. Shen
2
Center for Surface Analysis and Applications, Utah State University
, Logan, Utah 84322-4415, USA
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a)
Author to whom correspondence should be addressed; Electronic mail: mark.riffe@usu.edu
b)
Current address: Nanoscience and Nanoengineering Program, South Dakota School of Mines and Technology, Rapid City, South Dakota 57701, USA.
J. Appl. Phys. 113, 203710 (2013)
Article history
Received:
March 15 2013
Accepted:
May 16 2013
Citation
K. N. Chauhan, D. M. Riffe, E. A. Everett, D. J. Kim, H. Yang, F. K. Shen; Carrier capture dynamics of single InGaAs/GaAs quantum-dot layers. J. Appl. Phys. 28 May 2013; 113 (20): 203710. https://doi.org/10.1063/1.4808337
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