The role of momentum-dark excitons in the elementary optical response of bilayer WSe$_{2}$

Alexander H\"ogele; Andre Neumann; Ermin Malic; Feng Wang; Gunnar Bergh\"auser; Jessica Lindlau; Jonghwan Kim; L\'eo Colombier; Malte Selig

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The role of momentum-dark excitons in the elementary optical response of bilayer WSe$_{2}$

Jessica Lindlau, Malte Selig, Andre Neumann, Léo Colombier, Jonghwan Kim, Gunnar Berghäuser, Feng Wang, Ermin Malic

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Alexander Högele

Mesoscale and Nanoscale Physics · Submitted 3 Oct 2017

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim By combining theoretical calculations with comprehensive spectroscopy experiments, we identify the crucial role of momentum-indirect excitons for the understanding of basic absorption and emission spectra ubiquitously exhibited by various TMD BLs.

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arXiv ID1710.00989 (version 2)

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CitationAlexander H\"ogele, Andre Neumann, Ermin Malic, Feng Wang, Gunnar Bergh\"auser, Jessica Lindlau, Jonghwan Kim, L\'eo Colombier, Malte Selig. "The role of momentum-dark excitons in the elementary optical response of bilayer WSe$_{2}$." arXiv:1710.00989 (2017). https://pith.science/paper/BDWW5GFN

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Monolayer (ML) transition metal dichalcogenides (TMDs) undergo substantial changes in the single-particle band structure and excitonic optical response upon the addition of just one layer. As opposed to the single-layer limit, the bandgap of bilayer (BL) TMD semiconductors is indirect which results in reduced photoluminescence with richly structured spectra that have eluded a detailed understanding to date. Here, we provide a closed interpretation of the elementary optical responses of BL WSe$_2$ as a representative material for the wider class of TMD semiconductors. By combining theoretical calculations with comprehensive spectroscopy experiments, we identify the crucial role of momentum-indirect excitons for the understanding of basic absorption and emission spectra ubiquitously exhibited by various TMD BLs. Our results shed light on the origin of quantum dot (QD) formation in monolayer and bilayer crystals and will facilitate further advances directed at opto-electronic applications of layered TMD semiconductors in van der Waals heterostructures and devices.

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What the classifier reports for each sentence. The number is the probability it gave the label.
#	sentence	role	the authors' own work	states the main conclusion	strength
s0	Monolayer (ML) transition metal dichalcogenides (TMDs) undergo substantial changes in the single-particle band structure and excitonic optical response upon the addition of just one layer.	background 1.00	0.07	0.03	asserted 1.00
s1	As opposed to the single-layer limit, the bandgap of bilayer (BL) TMD semiconductors is indirect which results in reduced photoluminescence with richly structured spectra that have eluded a detailed understanding to date.	background 0.87	0.05	0.04	asserted 1.00
s2	Here, we provide a closed interpretation of the elementary optical responses of BL WSe$_2$ as a representative material for the wider class of TMD semiconductors.	contribution 0.99	0.91	0.17	asserted 0.99
s3	By combining theoretical calculations with comprehensive spectroscopy experiments, we identify the crucial role of momentum-indirect excitons for the understanding of basic absorption and emission spectra ubiquitously exhibited by various TMD BLs.	result 0.76	0.96	0.88	asserted 1.00
s4	Our results shed light on the origin of quantum dot (QD) formation in monolayer and bilayer crystals and will facilitate further advances directed at opto-electronic applications of layered TMD semiconductors in van der Waals heterostructures and devices.	interpretation 0.48	0.81	0.11	asserted 0.70

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Original abstract

Monolayer (ML) transition metal dichalcogenides (TMDs) undergo substantial changes in the single-particle band structure and excitonic optical response upon the addition of just one layer. As opposed to the single-layer limit, the bandgap of bilayer (BL) TMD semiconductors is indirect which results in reduced photoluminescence with richly structured spectra that have eluded a detailed understanding to date. Here, we provide a closed interpretation of the elementary optical responses of BL WSe$_2$ as a representative material for the wider class of TMD semiconductors. By combining theoretical calculations with comprehensive spectroscopy experiments, we identify the crucial role of momentum-indirect excitons for the understanding of basic absorption and emission spectra ubiquitously exhibited by various TMD BLs. Our results shed light on the origin of quantum dot (QD) formation in monolayer and bilayer crystals and will facilitate further advances directed at opto-electronic applications of layered TMD semiconductors in van der Waals heterostructures and devices.

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5 arXiv papers cite this in 7 sentences

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These dark states can lie energetically below the bright ones but are not directly accessible by light as they are either spin or momentum forbidden [ref] .

Molecule signatures in photoluminescence spectra of transition metal dichalcogenides · Introduction · 0.84

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Cites as background 3 papers

The realm of both momentum-direct excitons is expanded by the notion of momentum-indirect excitons involving electrons and holes in different valleys [ref] .

Dark and bright exciton formation, thermalization, and photoluminescence in monolayer transition metal dichalcogenides · Introduction · 0.90
The realm of both momentum-direct excitons is expanded by the notion of momentum-indirect excitons involving electrons and holes in different valleys [ref] .

Dark excitons in transition metal dichalcogenides · Introduction · 0.90
The realm of both momentum-direct excitons is expanded by the notion of momentum-indirect excitons involving electrons and holes in different valleys [ref] .

Identifying optical signatures of momentum-dark excitons in transition metal dichalcogenide monolayers · Introduction · 0.90

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