Study of Coherent Properties of an Exciton in Semiconductor Quantum Dots

Authors R.S. Kolodka, I.P. Pundyk, I. Dmitruk

Physics Department, Taras Shevchenko National University of Kyiv, 2/1, Akademik Glushkov Prosp., 03127 Kyiv, Ukraine

Issue Volume 12, Year 2020, Number 3
Dates Received 03 February 2020; revised manuscript received 15 June 2020; published online 25 June 2020
Citation R.S. Kolodka, I.P. Pundyk, I. Dmitruk, J. Nano- Electron. Phys. 12 No 3, 03022 (2020)
PACS Number(s) 61.46.Df, 73.22.− f, 78.67.Hc
Keywords Quantum dots (3) , Exciton (5) , Nanoparticles (70) , Coherent control, Relaxation (3) .

In this paper, we make a review of experimental techniques used in the study of semiconductor quantum dots and focus on the basic principles of optical coherent control of the exciton. We discuss both optical methods of investigation (time-resolved pump-probe, control of p-shell by measuring the photoluminescence from s-level, resonant fluorescence) and a photocurrent technique. Although the last one reduces the coherence of the system, but gives a quantitative measure of it. Special attention is applied to physical properties of self-assembled quantum dots as the methods of production which allow obtaining high-quality nanoparticles in macroscopic quantities. We also discuss our results obtained from colloidal CdSe quantum dots photoluminescence and transmission measurements, and Raman scattering spectra. We witness Stokes shift for an ensemble of nanoparticles that have a fairly broad size distribution. The analysis of the secondary radiation of the CdSe nanoparticles was done to study both processes leading to this energy shift and the loss of exciton polarization.

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