SKM 2021 – scientific programme

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SYWH: Symposium Physics of van der Waals 2D heterostructures

SYWH 1: Symposium: Physics of van der Waals 2D heterostructures

SYWH 1.2: Invited Talk

Thursday, September 30, 2021, 14:00–14:30, Audimax 2

Exciton optics, dynamics and transport in atomically thin materials — •Ermin Malic^1,2, Samuel Brem¹, Raul Perea-Causin², Daniel Erkensten², and Roberto Rosati¹ — ¹Philipps-University of Marburg, Germany — ²Chalmers University of Technology, Sweden

Monolayer transition metal dichalcogenides (TMDs) exhibit a remarkable excitonic landscape including bright and a variety of dark exciton states. Solving 2D material Bloch equations for excitons, phonons and photons, we obtain a microscopic access to the interplay of optics, ultrafast dynamics and diffusion of excitons in TMDs. In joint theory-experiments studies we shed light on the importance of momentum-dark excitons in low-temperature photoluminescence spectra [1], non-equilibrium exciton dynamics visualized in tr-ARPES experiments [2], temperature-resolved exciton-exciton annihilation processes [3], phonon-driven dissociation of excitons [4], and accelerated hot-exciton diffusion [5]. The gained microscopic insights into the spatiotemporal exciton dynamics are crucial for understanding and controlling many-particle phenomena governing exciton optics, dynamics and transport in technologically promising 2D materials.
[1] S. Brem et al., Nano Lett. 20, 2849 (2020)

[2] R. Wallauer et al., Nano Lett. 21, 5867 (2021)

[3] D. Erkensten et al., arXiv 2106.05035 (2021)

[4] R. Perea-Causin et al., Nanoscale 13, 1884 (2021)

[5] R. Rosati et al., arXiv 2105.10232 (2021)