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Stationary Phonon Squeezing by Optical Polaron Excitation

Title data

Papenkort, Thomas ; Axt, Vollrath M. ; Kuhn, Tilmann:
Stationary Phonon Squeezing by Optical Polaron Excitation.
In: Physical Review Letters. Vol. 118 (2017) Issue 9 . - Art.Nr. 097401, 5 S..
ISSN 1079-7114
DOI: https://doi.org/10.1103/PhysRevLett.118.097401

Abstract in another language

We demonstrate that a stationary squeezed phonon state can be prepared by a pulsed optical excitation of a semiconductor quantum well. Unlike previously discussed scenarios for generating squeezed phonons, the corresponding uncertainties become stationary after the excitation and do not oscillate in time. The effect is caused by two-phonon correlations within the excited polaron. We demonstrate by quantum kinetic simulations and by a perturbation analysis that the energetically lowest polaron state comprises two-phonon correlations which, after the pulse, result in an uncertainty of the lattice momentum that is continuously lower than in the ground state of the semiconductor. The simulations show the dynamics of the polaron formation process and the resulting time-dependent lattice uncertainties.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: quantum wells; semiconductors; ultrafast dynamics; phonon squeezing; optical excitation; phonon dynamics; lattice fluctuations; quantum kinetics; stationary squeezing; polaron formation; two-phonon correlations
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: 27 Nov 2017 13:42
Last Modified: 27 Nov 2017 13:42
URI: https://eref.uni-bayreuth.de/id/eprint/40686