Brightening of dark excitons in monolayers of semiconducting transition metal dichalcogenides
Maciej R. Molas,Clément Faugeras,A. O. Slobodeniuk,K. Nogajewski,Miroslav Bartos,Miroslav Bartos,Denis M. Basko,Marek Potemski +7 more
- Vol. 4, Iss: 2, pp 021003
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TLDR
In this paper, low-temperature magneto-photoluminescence experiments were conducted to demonstrate the brightening of dark excitons by an in-plane magnetic field B applied to monolayers of different semiconducting transition metal dichalcogenides.Abstract:
We present low-temperature magneto-photoluminescence experiments which demonstrate the brightening of dark excitons by an in-plane magnetic field B applied to monolayers of different semiconducting transition metal dichalcogenides. For WSe2 and WS2 monolayers, the dark exciton emission is observed at??~50 meV below the bright exciton peak and displays a characteristic doublet structure whose intensity grows with B 2, while no magnetic field induced emission peaks appear for MoSe2 monolayer. Our experiments also show that the MoS2 monolayer has a dark exciton ground state with a dark-bright exciton splitting energy of??~100 meV.read more
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Colloquium : Excitons in atomically thin transition metal dichalcogenides
Gang Wang,Alexey Chernikov,Mikhail M. Glazov,Tony F. Heinz,Xavier Marie,Thierry Amand,Bernhard Urbaszek +6 more
TL;DR: In this article, the authors reviewed recent progress in understanding of the excitonic properties in monolayer transition metal dichalcogenides (TMDs) and future challenges are laid out.
Journal ArticleDOI
Excitonic Linewidth Approaching the Homogeneous Limit in MoS 2 -Based van der Waals Heterostructures
Fabian Cadiz,E. Courtade,Cedric Robert,Gang Wang,Y. Shen,Hui Cai,T. Taniguchi,Kenji Watanabe,Hélène Carrère,D. Lagarde,M. Manca,Thierry Amand,Pierre Renucci,Sefaattin Tongay,Xavier Marie,B. Urbaszek +15 more
TL;DR: In this article, the authors show that encapsulation of monolayer MoS2 in hexagonal boron nitride can efficiently suppress the inhomogeneous contribution to the exciton linewidth, as they measure in photoluminescence and reflectivity a FWHM down to 2 meV at T=4
Journal ArticleDOI
Exciton physics and device application of two-dimensional transition metal dichalcogenide semiconductors
Thomas Mueller,Ermin Malic +1 more
TL;DR: In this paper, the properties of transition metal dichalcogenide semiconductors have been examined in depth, including bright, dark, localized and interlayer excitons.
Journal ArticleDOI
Probing dark excitons in atomically thin semiconductors via near-field coupling to surface plasmon polaritons
You Zhou,Giovanni Scuri,Dominik S. Wild,Alexander High,Alan Dibos,Luis A. Jauregui,Chi Shu,Kristiaan De Greve,Kateryna Pistunova,Andrew Y. Joe,Takashi Taniguchi,Kenji Watanabe,Philip Kim,Mikhail D. Lukin,Hongkun Park +14 more
TL;DR: The SPP-based near-field spectroscopy significantly improves experimental capabilities for probing and manipulating exciton dynamics of atomically thin materials, thus opening up new avenues for realizing active metasurfaces and robust optoelectronic systems, with potential applications in information processing and communication.
Journal ArticleDOI
In-Plane Propagation of Light in Transition Metal Dichalcogenide Monolayers: Optical Selection Rules.
Gang Wang,Cedric Robert,Mikhail M. Glazov,Fabian Cadiz,E. Courtade,Thierry Amand,Delphine Lagarde,Takashi Taniguchi,Kenji Watanabe,Bernhard Urbaszek,Xavier Marie +10 more
TL;DR: Experimental results are in agreement with the optical selection rules deduced from group theory analysis, highlighting the key role played by the different symmetries of the conduction and valence bands split by the spin-orbit interaction.
References
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Journal ArticleDOI
Atomically thin MoS2: a new direct-gap semiconductor
TL;DR: The electronic properties of ultrathin crystals of molybdenum disulfide consisting of N=1,2,…,6 S-Mo-S monolayers have been investigated by optical spectroscopy and the effect of quantum confinement on the material's electronic structure is traced.
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Coupled spin and valley physics in monolayers of MoS2 and other group-VI dichalcogenides.
TL;DR: It is shown that inversion symmetry breaking together with spin-orbit coupling leads to coupled spin and valley physics in monolayers of MoS2 and other group-VI dichalcogenides, making possible controls ofspin and valley in these 2D materials.
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Control of valley polarization in monolayer MoS2 by optical helicity
TL;DR: It is demonstrated that optical pumping with circularly polarized light can achieve complete dynamic valley polarization in monolayer MoS(2) (refs 11, 12), a two-dimensional non-centrosymmetric crystal with direct energy gaps at two valleys.
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Valley polarization in MoS2 monolayers by optical pumping
TL;DR: It is demonstrated that optical pumping with circularly polarized light can achieve a valley polarization of 30% in pristine monolayer MoS(2), demonstrating the viability of optical valley control and valley-based electronic and optoelectronic applications in MoS (2) monolayers.
Journal ArticleDOI
Valley-selective circular dichroism of monolayer molybdenum disulphide
Ting Cao,Gang Wang,Wen-Peng Han,Huiqi Ye,Chuanrui Zhu,Junren Shi,Qian Niu,Qian Niu,Ping-Heng Tan,Enge Wang,Baoli Liu,Ji Feng +11 more
TL;DR: It is shown, using first principles calculations, that monolayer molybdenum disulphide is an ideal material for valleytronics, for which valley polarization is achievable via valley-selective circular dichroism arising from its unique symmetry.