Ultrafast Optical Control of Rashba Interactions in a TMDC Heterostructure

• URL: http://arxiv.org/abs/2406.04454v1
• Date: Thu, 6 Jun 2024 19:27:28 GMT
• Title: Ultrafast Optical Control of Rashba Interactions in a TMDC Heterostructure
• Authors: Henry Mittenzwey, Abhijeet Kumar, Raghav Dhingra, Kenji Watanabe, Takashi Taniguchi, Cornelius Gahl, Kirill I. Bolotin, Malte Selig, Andreas Knorr,
• Abstract summary: We develop a theoretical description based on a microscopic approach to quantify the magnitude of Rashba interactions. We find that the Rashba-induced intravalley spin mixing becomes the dominating spin relaxation channel above T = 50 K. Our work identifies a previously unexplored spin-depolarization channel in heterostructures which can be used for ultrafast spin manipulation.
• Score: 0.17413461132662073
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We investigate spin relaxation dynamics of interlayer excitons in a MoSe2/MoS2 heterostructure induced by the Rashba effect. In such a system, Rashba interactions arise from an out-of-plane electric field due to photo-generated interlayer excitons inducing a phonon-assisted intravalley spin relaxation. We develop a theoretical description based on a microscopic approach to quantify the magnitude of Rashba interactions and test these predictions via time-resolved Kerr rotation measurements. In agreement with the calculations, we find that the Rashba-induced intravalley spin mixing becomes the dominating spin relaxation channel above T = 50 K. Our work identifies a previously unexplored spin-depolarization channel in heterostructures which can be used for ultrafast spin manipulation.

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