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Phonon wave packet emission during state preparation of a semiconductor quantum dot using different schemes

Title data

Bracht, Thomas K. ; Seidelmann, Tim ; Kuhn, Tilmann ; Axt, Vollrath Martin ; Reiter, Doris E.:
Phonon wave packet emission during state preparation of a semiconductor quantum dot using different schemes.
In: Physica Status Solidi B. (2022) . - No. 2100649.
ISSN 0370-1972
DOI: https://doi.org/10.1002/pssb.202100649

Official URL: Volltext

Project information

Project financing: Deutsche Forschungsgemeinschaft
Open Access funding enabled and organized by Projekt DEAL

Abstract in another language

The carrier–phonon interaction in semiconductor quantum dots (QDs) can greatly affect the optical preparation of the excited state. For resonant excitation used in the Rabi preparation scheme, the polaron is formed accompanied by the emission of a phonon wave packet, leading to a degradation of preparation fidelity. In this article, phonon wave packets for different coherent excitation schemes are analyzed. One example is the adiabatic rapid passage scheme relying on a chirped excitation. Herein, also a phonon wave packet is emitted, but the preparation fidelity can still be approximately unity. A focus is on the phonon impact on a recently proposed swing-up scheme, induced by two detuned pulses. Similar to the Rabi scheme, a degradation and a phonon wave packet emission are found, despite the detuning. If the swing-up frequency coincides with the maximum of the phonon spectral density, a series of wave packets is emitted yielding an even stronger degradation. The insight gained from our results further helps in designing an optimal preparation scheme for QDs.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: phonon wave packets; electron–phonon interaction; quantum dots; state preparation; two-level system
Subject classification: condensed matter physics (theoretical)
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III > Chair Theoretical Physics III - Univ.-Prof. Dr. Martin Axt
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 28 Mar 2022 06:55
Last Modified: 28 Mar 2022 06:55
URI: https://eref.uni-bayreuth.de/id/eprint/69036