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Interplay between coherent and incoherent phonons in optically excited biased quantum wells

Title data

Papenkort, Thomas ; Kuhn, Tilmann ; Axt, Vollrath M.:
Interplay between coherent and incoherent phonons in optically excited biased quantum wells.
In: Journal of Physics: Conference Series. Vol. 210 (2010) Issue 1 . - Art.Nr. 012054, 4 S..
ISSN 1742-6596
DOI: https://doi.org/10.1088/1742-6596/210/1/012054

Project information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

We present numerical simulations of the generation of coherent LO phonons in an electrically biased quantum well. An ultrashort laser pulse is used to simultaneously excite two exciton levels, which leads to an oscillating dipole moment that couples to the polar lattice and drives the phonons. The generation of coherent phonons becomes resonantly enhanced if the splitting of the two exciton levels is tuned to the LO phonon energy. In this case relaxation by emission of incoherent phonons becomes also possible. Our calculation therefore takes into account incoherent phonons on a quantum kinetic level as well. The intersubband relaxation by excitation of incoherent phonons competes with the generation of coherent phonons and is dominant in terms of the energy transferred.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: intersubband relaxation; coherent phonons; LO phonons; quantum wells; quantum kinetics; ultrafast dynamics
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 12:57
Last Modified: 30 Oct 2017 12:57
URI: https://eref.uni-bayreuth.de/id/eprint/40214