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Optical excitation of squeezed longitudinal optical phonon states in an electrically biased quantum well

Title data

Papenkort, Thomas ; Axt, Vollrath M. ; Kuhn, Tilmann:
Optical excitation of squeezed longitudinal optical phonon states in an electrically biased quantum well.
In: Physical Review B. Vol. 85 (2012) Issue 23 . - Art.Nr. 235317, 5 S..
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.85.235317

Project information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

We present quantum kinetic calculations showing how squeezed phonon states can be generated in a biased quantum well by optical driving. In such states the uncertainty of the lattice displacement or momentum is reduced below its zero-point value. It is shown that quantitative results that are meaningful for real observations require accounting for the inevitably limited spatial resolution. Our simulations yield results for the strength of the squeezing and predict under which conditions it can occur: Optical excitations on the lowest absorption line need at least two pulses to generate squeezing, while a single pulse below the band gap may produce a squeezed state which has an almost minimum-value uncertainty product.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: quantum wells; semiconductors; ultrafast dynamics; LO phonon squeezing; optical excitation; phonon dynamics; 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: 02 Nov 2017 06:58
Last Modified: 02 Nov 2017 06:58
URI: https://eref.uni-bayreuth.de/id/eprint/40239