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Phonon-Assisted Population Inversion of a Single InGaAs/GaAs Quantum Dot by Pulsed Laser Excitation

Title data

Quilter, J. H. ; Brash, A. J. ; Liu, Feng ; Glässl, Martin ; Barth, Andreas M. ; Axt, Vollrath M. ; Ramsay, A. J. ; Skolnick, M. S. ; Fox, A. M.:
Phonon-Assisted Population Inversion of a Single InGaAs/GaAs Quantum Dot by Pulsed Laser Excitation.
In: Physical Review Letters. Vol. 114 (2015) Issue 13 . - Art.Nr. 137401, 5 S..
ISSN 1079-7114
DOI: https://doi.org/10.1103/PhysRevLett.114.137401

Project information

Project financing: Deutsche Forschungsgemeinschaft
Supported by the EPSRC (UK) EP/J007544/1

Abstract in another language

We demonstrate a new method to realize the population inversion of a single InGaAs/GaAs quantum dot excited by a laser pulse tuned within the neutral exciton phonon sideband. In contrast to the conventional method of inverting a two-level system by performing coherent Rabi oscillation, the inversion is achieved by rapid thermalization of the optically dressed states via incoherent phonon-assisted relaxation. A maximum exciton population of 0.67±0.06 is measured for a laser tuned 0.83 meV to higher energy. Furthermore, the phonon sideband is mapped using a two-color pump-probe technique, with its spectral form and magnitude in very good agreement with the result of path-integral calculations.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: Featured in Physics as Editors' Suggestion
Selected for a Viewpoint in Physics: Crystal Vibrations Invert Quantum Dot Exciton
Open Access
Keywords: quantum dot; path-integrals; nonlinear optics; ultrafast dynamics; pure dephasing; phonons; decoherence; exciton inversion; non-Markovian dynamics; memory effects; phonon-induced memory; multi-phonon processes; exciton preparation; phonon-assisted off-resonant preparation; numerically complete real-time path integrals; quantum dissipative 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: 02 Nov 2017 12:49
Last Modified: 02 Nov 2017 12:49
URI: https://eref.uni-bayreuth.de/id/eprint/40281