Titlebar

Export bibliographic data
Literature by the same author
plus on the publication server
plus at Google Scholar

 

Ultrafast carrier and phonon dynamics in GaAs and GaN quantum dots

Title data

Krummheuer, B. ; Vagov, Alexei ; Kuhn, Tilmann ; Glanemann, Markus ; Axt, Vollrath M. ; D'Amico, I. ; Rossi, F.:
Ultrafast carrier and phonon dynamics in GaAs and GaN quantum dots.
In: Semiconductor Science and Technology. Vol. 19 (2004) Issue 4 . - S31-S33.
ISSN 0268-1242
DOI: https://doi.org/10.1088/0268-1242/19/4/012

Project information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

We analyse the electronic and phononic dynamics in GaAs and GaN quantum dot structures due to their interaction with acoustic phonons. We compare results for two specific quantum dot heterostructures which have been proposed as hardware building blocks for a quantum computer in recent quantum computation/information schemes. In particular, we are interested in the loss of coherence after excitation with an ultrashort laser pulse and in the dynamics of phonons which are created as a consequence of the optical excitation process. Our results are non-perturbative with respect to both carrier–phonon and carrier–light interaction and therefore include multi-phonon processes of arbitrary order. We find that, due to different quantum dot sizes, involved electric fields and material parameters, the decoherence is stronger in the GaN dots. The interplay of these effects also strongly determines the details of the created phonon occupation, which splits into two parts: one remains in the vicinity of the dot and forms a stable polaron and another leaves the dot as a phononic wave packet travelling with the velocity of sound. Due to the dot geometry and the carrier–phonon coupling matrix elements this phonon emission is strongly anisotropic.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: quantum dot; generating functions; non-linear optics; ultrafast dynamics; pure dephasing; phonons; analytical solutions; phonon sidebands; excitons; four-wave mixing; polaron formation; Non-perturbative solution; GaN dots; GaAs dots
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: No
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 23 Oct 2017 09:45
Last Modified: 23 Oct 2017 09:45
URI: https://eref.uni-bayreuth.de/id/eprint/40108