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Impact of dark superpositions on the relaxation dynamics of an optically driven phonon-coupled exciton-biexciton quantum-dot system

Title data

Glässl, Martin ; Croitoru, Mikhail D. ; Vagov, Alexei ; Axt, Vollrath M. ; Kuhn, Tilmann:
Impact of dark superpositions on the relaxation dynamics of an optically driven phonon-coupled exciton-biexciton quantum-dot system.
In: Physical Review B. Vol. 85 (2012) Issue 19 . - Art.Nr. 195306, 5 S..
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.85.195306

Project information

Project financing: Alexander von Humboldt-Stiftung
Studienstiftung des deutschen Volkes

Abstract in another language

Within a numerically complete real-time path integral approach we identify the realization of dark superpositions as a general mechanism that strongly modifies the quantum dissipative relaxation of an optically driven quantum dot coupled to acoustic phonons. The presence of dark superpositions in an exciton-biexciton system that can be controlled by varying the laser polarization is shown to have a significant impact on the stationary values of the electronic occupations as well as on the precedent relaxation dynamics. Similar to the critical slowing down that is known to occur near phase transitions the time to reach a stationary state rises with no limit for polarizations that nearly realize a dark superposition. Interestingly, this time may show a nonmonotonic temperature dependence caused by a crossover between coherent and incoherent relaxation dynamics.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: quantum dot; path-integrals; non-linear optics; ultrafast dynamics; pure dephasing; phonons; decoherence; excitons; biexcitons; non-Markovian dynamics; memory effects; phonon-induced memory; multi-phonon processes; dark superpositions; numerically complete real-time path integrals; quantum dissipative dynamics; phonon induced relaxation
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 10:39
Last Modified: 02 Nov 2017 10:39
URI: https://eref.uni-bayreuth.de/id/eprint/40244