Multi-particle effects in far-IR optical transmission spectra of Ge/Si quantum dots

18th Russian Youth Conference on Physics of Semiconductors and Nanostructures, Opto- and Nanoelectronics

Pashnev, D.A.^1 ; Balagula, R.M.^1 ; Sofronov, A.N.^1 ; Firsov, D.A.^1 ; Vorobjev, L.E.^1

Peter the Great St.Petersburg Polytechnic University, Polytechnicheskaya 29, St.Petersburg

195251, Russia^1

关键词: Equilibrium absorption;    Optical transmission spectrum;    Particle excitations;    Photoinduced absorption;    Quantum dot ensemble;    Quantum dot structure;    Single particle state;    Thermal distributions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/816/1/012026/pdf
DOI  :  10.1088/1742-6596/816/1/012026

来源: IOP

【 摘 要 】

Photoinduced and equilibrium optical transmission was studied in undoped and δ-doped Ge/Si quantum dot structures in the far-infrared spectral range. Multi-particle excitations were observed in the absorption spectra of the structures with different doping levels. Photoinduced absorption spectra demonstrate the thermal distribution of the photoexcited holes over the single-particle states of the quantum dot ensemble in contrast with the equilibrium absorption spectra.