Freiburg 2019 – wissenschaftliches Programm

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FM: Fall Meeting

FM 38: Enabling Technologies: Quantum Dots, Quantum Wires, Point Contacts and Excitonic Systems

FM 38.3: Talk

Dienstag, 24. September 2019, 14:30–14:45, 3043

LO-phonon emission by electrons from single-electron sources — •Clarissa Barratt, Lewis Clark, and Clive Emary — Joint Quantum Centre Durham-Newcastle, School of Mathematics, Statistics and Physics, Newcastle University, Newcastle Upon Tyne, NE1 7RU, UK

There is substantial interest in the use of dynamic quantum dots as sources of single electrons, both to explore fundamental issues off solid-state physics as well as pursue quantum-technology applications. This is due to their high accuracy and speed, and the high energy of injection [1].

In this contribution we consider the effect of longitudinal-optical-phonon emission on the relaxation of electrons from a single electron source. Previous approaches to modelling such systems have been semiclassical, using the classical probability distribution only [2].

We derive the complete quantum master equation for this system which takes into account the coherence terms of the density matrix as well as the population previously considered. Our aim is to have a full quantum mechanical description of the electron transport process. These results will be used to calculate arrival times of the electrons, as well as for input into potential future experiments.

[1] Giblin, S. P. et al., An accurate high-speed single-electron quantum dot pump, NJP 12, 073013 (2010)

[2] Emary, C. et al., Phonon emission and arrival times of electrons from a single-electron source, PRB 93, 035436 (2016)