Phonons and excitonic complex in a monolayer semiconductor

Xiaodong Xu

doi:10.1117/12.2590942

5 March 2021 Phonons and excitonic complex in a monolayer semiconductor

Xiaodong Xu

Proceedings Volume 11694, Photonic and Phononic Properties of Engineered Nanostructures XI; 116941G (2021) https://doi.org/10.1117/12.2590942
Event: SPIE OPTO, 2021, Online Only

Abstract

The coupling between spin, charge, and lattice degrees of freedom plays an important role in a wide range of fundamental phenomena. Monolayer semiconductor is an emerging platform for studying these coupling effects due to unique spin-valley locking physics for hosting rich excitonic species and reduced screening for strong Coulomb interaction. In this talk, I will present the observation of both symmetry-allowed and -forbidden valley phonons, i.e. phonons with momentum vectors pointing to the corners of Brillouin zone, in a monolayer semiconductor WSe2. We unravel a series of photoluminescence peaks as valley phonon replicas of neutral and charged dark excitons, as well as intrinsic donor bound excitonic states with anomalously long population lifetime (> 5 µs).Our work shows monolayer WSe2 is a prime candidate for studying interactions between spin, pseudospin, and zone-edge phonons.

Conference Presentation

Citation Download Citation

Xiaodong Xu "Phonons and excitonic complex in a monolayer semiconductor", Proc. SPIE 11694, Photonic and Phononic Properties of Engineered Nanostructures XI, 116941G (5 March 2021); https://doi.org/10.1117/12.2590942

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