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Fizika i Tekhnika Poluprovodnikov, 2020, Volume 54, Issue 11, Page 1262 (Mi phts6678)  
NANOSTRUCTURES : PHYSICS AND TECHNOLOGY 28th International Symposium (Minsk, Republic of Belarus, September, 2020)
Excitons in Nanostructures

Spin-valley dynamics of interlayer excitons in heterobilayers Mo$_x$W$_{1-x}$Se$_2$/WSe$_2$

A. D. Liubomirova, V. Kravtsovb, R. V. Cherbunina

a St. Petersburg State University, 198504 St. Petersburg, Russia
b Information Technologies, Mechanics and Optics University, 197101 St. Petersburg, Russia
Full-text PDF (28 kB)
Abstract: We study spin-valley relaxation dynamics in two-dimensional Mo$_x$W$_{1-x}$Se$_2$/WSe$_2$ heterobilayers with different relative Mo/W concentration $x$ in the monolayer alloy. Three types of heterobilayers with $x$ = 1.00, 0.50, 0.33 are studied in time-resolved Kerr rotation experiments for different wavelengths and temperatures. The spin-valley relaxation times are found to decrease from $\sim$10 nanoseconds for $x$ = 1.00 to $\sim$50 picoseconds for $x$ = 0.33. The observed relaxation times are limited by the recombination of indirect excitons formed in the heterobilayers. Our results demonstrate that spin-valley relaxation in alloy-based van der Waals heterostructures can be controlled via their chemical composition.
Keywords: TMDC, heterobilayers, interlayer excitons, spin-valley relaxation.
Funding agency Grant number
Saint Petersburg State University 51125686
Russian Foundation for Basic Research 19-52-51010
The authors acknowledge Saint-Petersburg State University for a research Grant no. 51125686 and the group of Prof. Alexander Tartakovskii for providing several TMD heterostructure samples. V.K. acknowledges funding from RFBR according to project no. 19-52-51010.
Received: 23.06.2020
Revised: 23.07.2020
Accepted: 27.07.2020
English version:
Semiconductors, 2020, Volume 54, Issue 11, Pages 1518–1521
DOI: https://doi.org/10.1134/S1063782620110196
Document Type: Article
Language: English
Citation: A. D. Liubomirov, V. Kravtsov, R. V. Cherbunin, “Spin-valley dynamics of interlayer excitons in heterobilayers Mo$_x$W$_{1-x}$Se$_2$/WSe$_2$”, Fizika i Tekhnika Poluprovodnikov, 54:11 (2020), 1262; Semiconductors, 54:11 (2020), 1518–1521
Citation in format AMSBIB
\Bibitem{LiuKraChe20}
\by A.~D.~Liubomirov, V.~Kravtsov, R.~V.~Cherbunin
\paper Spin-valley dynamics of interlayer excitons in heterobilayers Mo$_x$W$_{1-x}$Se$_2$/WSe$_2$
\jour Fizika i Tekhnika Poluprovodnikov
\yr 2020
\vol 54
\issue 11
\pages 1262
\mathnet{http://mi.mathnet.ru/phts6678}
\transl
\jour Semiconductors
\yr 2020
\vol 54
\issue 11
\pages 1518--1521
\crossref{https://doi.org/10.1134/S1063782620110196}
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