RAUTERT, Janina, Timur S. SHAMIRZAEV, S. V. NEKRASOV, Dmitri R. YAKOVLEV, Petr KLENOVSKÝ, Yu. G. KUSRAYEV and Manfred BAYER. Optical orientation and alignment of excitons in direct and indirect band gap (In,Al)As/AlAs quantum dots with type-I band alignment. Physical Review B. American Physical Society, 2019, vol. 99, No 19, p. 195411-195420. ISSN 2469-9950. doi:10.1103/PhysRevB.99.195411.
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Basic information
Original name Optical orientation and alignment of excitons in direct and indirect band gap (In,Al)As/AlAs quantum dots with type-I band alignment
Authors RAUTERT, Janina (276 Germany), Timur S. SHAMIRZAEV (643 Russian Federation), S. V. NEKRASOV (643 Russian Federation), Dmitri R. YAKOVLEV (643 Russian Federation), Petr KLENOVSKÝ (203 Czech Republic, guarantor, belonging to the institution), Yu. G. KUSRAYEV (643 Russian Federation) and Manfred BAYER (276 Germany).
Edition Physical Review B, American Physical Society, 2019, 2469-9950.
Other information
Original language English
Type of outcome Article in a journal
Field of Study 10302 Condensed matter physics
Country of publisher United States of America
Confidentiality degree is not subject to a state or trade secret
WWW URL
Impact factor Impact factor: 3.575
RIV identification code RIV/00216224:14310/19:00109629
Organization unit Faculty of Science
Doi http://dx.doi.org/10.1103/PhysRevB.99.195411
UT WoS 000467383900003
Keywords in English (InAl)As/AlAs;kvantove tecky;rekombinacni procesy
Tags International impact, Reviewed
Changed by Changed by: Mgr. Michal Petr, učo 65024. Changed: 13/5/2020 10:52.
Abstract
The spin structure and spin dynamics of excitons in an ensemble of (In,Al)As/AlAs quantum dots (QDs) with type-I band alignment, containing both direct and indirect band gap dots, are studied. Time-resolved and spectral selective techniques are used to distinguish between the direct and indirect QDs. The exciton fine structure is studied by means of optical alignment and optical orientation techniques in magnetic fields applied in the Faraday or Voigt geometries. A drastic difference in emission polarization is found for the excitons in the direct QDs involving a ?-valley electron and the excitons in the indirect QDs contributed by an X -valley electron. We show that in the direct QDs the exciton spin dynamics is controlled by the anisotropic exchange splitting, while in the indirect QDs it is determined by the hyperfine interaction with nuclear field fluctuations. The anisotropic exchange splitting is determined for the direct QD excitons and compared with model calculations.
Links
8C18001, research and development projectName: CMOS Compatible Single Photon Sources based on SiGe Quantum Dots (Acronym: CUSPIDOR)
Investor: Ministry of Education, Youth and Sports of the CR, ERA-NET, QUANTERA
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