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Real-time path integrals for quantum dots : Quantum dissipative dynamics with superohmic environment coupling

Title data

Vagov, Alexei ; Croitoru, Mikhail D. ; Glässl, Martin ; Axt, Vollrath M. ; Kuhn, Tilmann:
Real-time path integrals for quantum dots : Quantum dissipative dynamics with superohmic environment coupling.
In: Physical Review B. Vol. 83 (2011) Issue 9 . - Art.Nr. 094303, 12 S..
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.83.094303

Project information

Project financing: Alexander von Humboldt-Stiftung

Abstract in another language

Based on a representation of the functional integral as the time evolution of the augmented density matrix we have worked out an implementation of the real-time path integral approach that is applicable to the dynamics of quantum dissipative systems with superohmic coupling to the environment. As a prototype for such a system we consider a laser-driven strongly confined semiconductor quantum dot coupled to acoustic phonons. First applications of this approach to quantum dot systems have already been published. Here, we provide a detailed description of the implementation, including a discussion of numerical issues and extend the formalism from two-level quantum dot models with a pure-dephasing type carrier-phonon coupling to the case of multiple electronic levels. The method allows for numerically exact calculations of the dot dynamics at strong dot-phonon and dot-laser coupling and at long times, usually inaccessible by other approaches.

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; non-Markovian dynamics; memory effects; phonon-induced memory; multi-phonon processes; quantum dissipative dynamics; numerically exact; superohmic environment
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 14:30
Last Modified: 30 Oct 2017 14:30
URI: https://eref.uni-bayreuth.de/id/eprint/40231