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Optical Stark shift to control the dark exciton occupation of a quantum dot in a tilted magnetic field

Title data

Neumann, Miriam ; Kappe, Florian ; Bracht, Thomas K. ; Cosacchi, Michael ; Seidelmann, Tim ; Axt, Vollrath Martin ; Weihs, Gregor ; Reiter, Doris E.:
Optical Stark shift to control the dark exciton occupation of a quantum dot in a tilted magnetic field.
In: Physical Review B. Vol. 104 (August 2021) . - No. 075428.
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.104.075428

Project information

Project financing: Deutsche Forschungsgemeinschaft
Studienstiftung des deutschen Volkes
Austrian Science Fund FWF

Abstract in another language

When a detuned and strong laser pulse acts on an optical transition, a Stark shift of the corresponding energies occurs. We analyze how this optical Stark effect can be used to prepare and control the dark exciton occupation in a semiconductor quantum dot. The coupling between the bright and dark exciton states is facilitated by an external magnetic field. Using sequences of laser pulses, we show how the dark exciton and different superposition states can be prepared. We give simple analytic formulas, which yield a good estimate for optimal preparation parameters. The preparation scheme is quite robust against the influence of acoustic phonons. We further discuss the experimental feasibility of the used Stark pulses. Giving a clear physical picture, our results will stimulate the usage of dark excitons in schemes to generate photons from quantum dots.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: dark states; quantum control; preparation of dark states; nonlinear optics; ultrafast dynamics
Subject classification: condensed matter physics
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
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 18 Aug 2021 08:03
Last Modified: 18 Aug 2021 08:03
URI: https://eref.uni-bayreuth.de/id/eprint/66816