The binding energy of biexcitons in alloy ZnxCd1−xS quantum dots detected by femtosecond laser spectroscopy.

Autor:	Nadtochenko, Viktor, Kostrov, Andrei, Titov, Andrei, Aybush, Arseniy, Gostev, Fedor, Shelaev, Ivan, Shepel, Denis, Antonova, Olga, Kochev, Sergei, Kabachii, Yuriy, Valetsky, Pyotr
Předmět:	QUANTUM dots BINDING energy QUANTUM transitions ABSORPTION spectra EXCITED states LASER spectroscopy
Zdroj:	Applied Physics A: Materials Science & Processing; Apr2020, Vol. 126 Issue 4, p1-9, 9p, 2 Charts, 7 Graphs
Abstrakt:	Biexcitons localized at ZnxCd1−xS quantum dots (x = 0.37 or 0.45) with a diameter of ~ 45 Å synthesized by two different methods were studied by femtosecond laser spectroscopy. The spectral features of ultrafast transient absorption spectra at the short-time delay of 70 fs are associated with the three lowest energy transitions of quantum dots. The shapes of the transient absorption bands were modeled by fitting to linear absorption. The spectral positions of the absorption components of the excited state in the transient spectra take into account the energy of the biexciton coupling. By fitting the experimental transient absorption spectra of ZnxCd1−xS QDs, the binding energies of biexcitons were determined. The biexciton binding energies vary from 16.6 to 37 meV depending on the biexciton transition excited at the ZnxCd1−xS quantum dot. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
Externí odkaz:	Zobrazit plný text záznamu Plný text ve formátu HTML
Nepřihlášeným uživatelům se plný text nezobrazuje	K zobrazení výsledku je třeba se přihlásit.