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HL: Fachverband Halbleiterphysik
HL 29: 2D Materials III: Growth and Heterostructures (joint session O/HL)
HL 29.13: Vortrag
Dienstag, 17. März 2020, 13:30–13:45, GER 38
Excited-State Trions in Monolayer WS2 — •Thorsten Deilmann1, Ashish Arora2, Till Reichenauer2, Johannes Kern2, Steffen Michaelis de Vasconcellos2, Michael Rohlfing1, and Rudolf Bratschitsch2 — 1Institute of Solid State Theory, University of Münster, Germany — 2Institute of Physics and Center for Nanotechnology, University of Münster, Germany
We discover an excited bound three-particle state, the 2s trion, appearing energetically below the 2s exciton in monolayer WS2, using absorption spectroscopy and ab initio GW and Bethe-Salpeter equation calculations [1]. The measured binding energy of the 2s trion (22 meV) is smaller compared to the 1s intravalley and intervalley trions (37 and 31 meV). Our discovery underlines the importance of trions for the entire excitation spectrum of two-dimensional semiconductors. [1] Phys. Rev. Lett. 123, 167401 (2019)