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Energy transport and coherence properties of acoustic phonons generated by optical excitation of a quantum dot

Titelangaben

Wigger, Daniel ; Lüker, Sebastian ; Reiter, Doris ; Axt, Vollrath M. ; Machnikowski, Paweł ; Kuhn, Tilmann:
Energy transport and coherence properties of acoustic phonons generated by optical excitation of a quantum dot.
In: Journal of Physics: Condensed Matter. Bd. 26 (2014) Heft 35 . - Art.Nr. 355802 , 14 S..
ISSN 1361-648X
DOI: https://doi.org/10.1088/0953-8984/26/35/355802

Angaben zu Projekten

Projektfinanzierung: Deutsche Forschungsgemeinschaft

Abstract

The energy transport of acoustic phonons generated by the optical excitation of a quantum dot as well as the coherence properties of these phonons are studied theoretically both for the case of a pulsed excitation and for a continuous wave (CW) excitation switched on instantaneously. For a pulsed excitation, depending on pulse area and pulse duration, a finite number of phonon wave packets is emitted, while for the case of a CW excitation a sequence of wave packets with decreasing amplitude is generated after the excitation has been switched on. We show that the energy flow associated with the generated phonons is partly related to coherent phonon oscillations and partly to incoherent phonon emission. The efficiency of the energy transfer to the phonons and the details of the energy flow depend strongly and in a non-monotonic way on the Rabi frequency exhibiting a resonance behavior. However, in the case of CW excitation it turns out that the total energy transferred to the phonons is directly linked in a monotonic way to the Rabi frequency.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Keywords: phonon wave packets; phonon dynamics; coherent phonons; incoherent phonons; energy transport; ultrafast dynamics; electron-phonon interaction; quantum dot
Institutionen der Universität: Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Theoretische Physik III > Lehrstuhl Theoretische Physik III - Univ.-Prof. Dr. Martin Axt
Fakultäten
Fakultäten > Fakultät für Mathematik, Physik und Informatik
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Theoretische Physik III
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
Eingestellt am: 03 Nov 2017 07:51
Letzte Änderung: 03 Nov 2017 07:51
URI: https://eref.uni-bayreuth.de/id/eprint/40260