期刊
PHYSICAL REVIEW B
卷 94, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.94.014305
关键词
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资金
- Deutsche Forschungsgemeinschaft (DFG) [Sonderforschungsbereich 787]
- Deutsche Forschungsgemeinschaft (DFG) via Research Training Group 1558
Submonolayer quantum dots combine the zero-dimensional charge-carrier confinement of self-assembled quantum dotswith the large density of states of a quantum well. Electroluminescence and pump-probe experiments on a submonolayer-based optical amplifier show that the system exhibits a high gain of 90 cm(-1) and an ultrafast gain recovery. We propose a rate equation system describing the microscopic carrier dynamics which quantitatively reproduces the observed behavior and provides deeper theoretical understanding of the material system. In contrast to Stranski-Krastanov quantum dots, the fast gain recovery is enhanced by a strong interdot coupling. Optically inactive submonolayer states form an efficient carrier reservoir and give rise to a large nonlinear optical response.
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