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Quantum kinetics of squeezed lattice displacement generated by phonon down conversion

Title data

Daniels, J. M. ; Papenkort, Thomas ; Reiter, Doris ; Kuhn, Tilmann ; Axt, Vollrath M.:
Quantum kinetics of squeezed lattice displacement generated by phonon down conversion.
In: Physical Review B. Vol. 84 (2011) Issue 16 . - Art.Nr. 165310, 8 S..
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.84.165310

Project information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

We study the fluctuation properties of longitudinal acoustic (LA) phonons generated by the anharmonic decay of coherent longitudinal optical phonons in a bulk semiconductor and a quantum dot. This process is comparable to the down conversion of photons, which is well known to generate squeezed photons. We use a quantum kinetic model to calculate the fluctuations of lattice displacement and momentum. This allows us to analyze the strength and the spatial distribution of the fluctuations. It is shown that the fluctuations may fall below their vacuum value, i.e., squeezing occurs. The squeezing only persists for short times due to fast dephasing of the different LA phonon modes and the increasing LA phonon population. In the quantum dot case, it is found that although LA phonon wave packets travel out of the quantum dot, the squeezing does not leave the vicinity of the dot but remains confined.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: quantum dots; bulk semiconductors; ultrafast dynamics; phonon squeezing; optical excitation; phonon dynamics; phonon down conversion; lattice fluctuations; quantum kinetics
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: 30 Oct 2017 14:10
Last Modified: 30 Oct 2017 14:10
URI: https://eref.uni-bayreuth.de/id/eprint/40226