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Fluctuation properties of acoustic phonons generated by ultrafast optical excitation of a quantum dot

Title data

Wigger, Daniel ; Reiter, Doris ; Axt, Vollrath M. ; Kuhn, Tilmann:
Fluctuation properties of acoustic phonons generated by ultrafast optical excitation of a quantum dot.
In: Physical Review B. Vol. 87 (2013) Issue 8 . - Art.Nr. 085301, 7 S..
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.87.085301

Abstract in another language

We study theoretically the fluctuation properties of acoustic phonons created in a semiconductor quantum dot after ultrafast optical excitation. An excitation with a single ultrafast pulse creates an exciton confined to the quantum dot, which is coupled to longitudinal acoustic phonons. This leads to the formation of a polaron in the quantum dot accompanied by the emission of a phonon wave packet. We show that the fluctuations of the lattice displacement associated with the wave packet after a single laser pulse excitation in resonance with the exciton transition are always larger than their respective vacuum values. Manipulation of the exciton with a second pulse can result in a reduction of the fluctuations below their vacuum limit, which means that the phonons are squeezed. We show that the squeezing properties of the wave packet strongly depend on the relative phase and the time delay between the two laser pulses.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: quantum dots; generating functions; exact results; ultrafast dynamics; phonon squeezing; optical excitation; phonon dynamics; lattice fluctuations
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
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 02 Nov 2017 13:25
Last Modified: 02 Nov 2017 13:25
URI: https://eref.uni-bayreuth.de/id/eprint/40250