Berlin 2018 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 20: 2D materials: Chalcogenides I (joint session HL/DS)

DS 20.9: Vortrag

Mittwoch, 14. März 2018, 11:45–12:00, A 151

Spatiotemporal dynamics of the carrier capture into localized states in a TMDC monolayer — •Roberto Rosati, Frank Lengers, Doris E. Reiter, and Tilmann Kuhn — Institut für Festkörpertheorie, Universität Münster, Wilhelm-Klemm-Str. 10, 48149 Münster

Monolayers of transition metal dichalcogenides (TMDC) have attracted wide attention due to their interesting optical and electronic properties. Local strain distributions lead to the formation of embedded 0D confinement potentials which can be exploited, e.g., as single photon sources [1]. In such hybrid 2D-0D systems, the bound states of the 0D potential may be populated through carrier capture by emission of optical phonons. Such capture processes are known to generate non-trivial spatiotemporal dynamics in hybrid 1D-0D systems [2]. In this work we study the capture of a wave packet in a MoSe2 monolayer into localized states. We find interesting spatio-temporal dynamics of the trapped charge distribution associated with the capture into specific superposition states, which can be controlled by the propagation direction of the wave packet. To calculate the dynamics we use a recently introduced Lindblad single-particle approach, which allows us to deal with the dimensionality-related computational demands and, at the same time, catches the most relevant features of the carrier capture, in particular its locality [3].
 [1] Kern et al., Adv. Mater., 28, 7101-7105 (2016)
 [2] Glanemann et al., Phys. Rev. B 72, 045354 (2005)
 [3] Rosati et al., Phys. Rev. B 95, 165302 (2017)