Decoherence in semiconductor nanostructures with type-II band alignment: All-optical measurements using Aharonov-Bohm excitons

Abstract

We examine the temperature dependence of the visibility of the excitonic Aharonov-Bohm peak in type-II quantum dots. We obtain a functional temperature dependence, which is similar to that determined by transport experiments, namely, with T -1 term due to electron-electron collisions and with T -3 term due to electron-phonon interactions. However, the magnitude of the latter term is much smaller than that for the transport electrons and similar to the interaction strength of the exciton-phonon coupling. Such suppressed electron-phonon interaction ushers a way for all-optical studies of decoherence processes in semiconductor nanostructures as other dephasing mechanisms become more pronounced.

Near-infrared emission from spatially indirect excitons in type II ZnTe/CdSe/(Zn,Mg)Te core/double-shell nanowires

“…Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. nanowire (NW) heterojunctions is the opportunity to investigate coherently rotating states, which should be manifested by the presence of Aharonov-Bohm oscillations in an external magnetic field [14][15][16]. The latter effect might be employed in the framework of several protocols proposed for quantum information storage [17][18][19].…”