We study spin-valley relaxation dynamics in two-dimensional Mo_xW_1-xSe₂/WSe₂ 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 ~10 nanoseconds for x=1.00 to ~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.

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Дата начала обработки статистических данных - 27 января 2016 г.