Fizika Nizkikh Temperatur: Volume 44, Number 8 (August 2018), p. 1045-1051    ( to contents , go back )

Exciton spectroscopy with a spatially separated electron and a hole in a Ge/Si heterostructure with germanium quantum dots

S.I. Pokutnyi

Chuiko Institute of Surface Chemistry of NAS of Ukraine, 17 General Naumov str., Kyiv, 03164, Ukraine

Received October 31, 2017, revised December 27, 2017


It is shown that taking into account the centrifugal energy in the Hamiltonian of an exciton with a spatially separated electron and a hole (the hole moves at the germanium quantum dot and the electron is localized above the spherical interface quantum dot–silicon matrix) leads to the appearance in the zone of surface exciton states of quasistationary states that with in-creasing radius of the quantum dot go into stationary states. It is established that the spectra of interband ab-sorption by a nanosystem are composed of energy bands formed by electron transitions between quasistationary and stationary states, and intraband absorption spectra from zones due to electron transitions between station-ary states.

PACS: 73.21.–b Electron states and collective excitations in multilayres, quantum wells, mesoscopic, and nanoscale systems.

Key words: quasistationary surface states of an exciton, quantum dots.

Published online: June 27, 2018

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