Observation of interlayer excitons in 
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 single crystals

Horng, Jason; Stroucken, T.; Zhang, Long; Paik, Eunice; Deng, Hui; Koch, S. W.

doi:10.1103/physrevb.97.241404

Cited by 73 publications

(55 citation statements)

References 40 publications

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“…The RC spectrum of the 2ML (Fig. 7) shows 4 resonances [38] which, in reference to our theoretical expectations (see Figs. 3 and 6), are assigned to the pair of intra-(X A ) and interlayer (X ′ A ) A-excitons, and to the analogous pair of intra-(X B ) and interlayer (X ′ B ) Bexcitons.…”

Section: Absorption Resonances In Mos2 Multilayerssupporting

confidence: 86%

Fine structure of K-excitons in multilayers of transition metal dichalcogenides

et al. 2019

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Reflectance and magneto-reflectance experiments together with theoretical modelling based on the k · p approach have been employed to study the evolution of direct bandgap excitons in MoS2 layers with a thickness ranging from mono-to trilayer. The extra excitonic resonances observed in MoS2 multilayers emerge as a result of the hybridization of Bloch states of each sub-layer due to the interlayer coupling. The properties of such excitons in bi-and trilayers are classified by the symmetry of corresponding crystals. The inter-and intralayer character of the reported excitonic resonances is fingerprinted with the magneto-optical measurements: the excitonic g-factors of opposite sign and of different amplitude are revealed for these two types of resonances. The parameters describing the strength of the spin-orbit interaction are estimated for bi-and trilayer MoS2.

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Section: Absorption Resonances In Mos2 Multilayerssupporting

confidence: 86%

Fine structure of K-excitons in multilayers of transition metal dichalcogenides

et al. 2019

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“…Comparisons of binding energies for these interlayer excitons are shown in Figure (a) without the exciton–LO phonon coupling at D = 7 nm. As can be seen that binding energies are in range of 160–173 meV for these interlayer excitons, which are consistent with the recent measurements . The higher binding energies are in MoS 2 –WS 2 , MoSe 2 –WS 2 , and WS 2 –WS 2 double layers, and the lower ones are in WSe 2 –MoS 2 and WSe 2 –MoSe 2 double layers.…”

Section: Effective Masses Of Electron (Hole) and The Energies Of Lo Psupporting

confidence: 90%

Effect of Exciton–Phonon Coupling on the Interlayer Excitons in Transition Metal Dichalcogenides Double Layers

Wang

Dong

et al. 2018

Physica Rapid Research Ltrs

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We investigate the correction of interlayer exciton binding energy in transition metal dichalcogenides double layers arising from the exciton-optical phonon coupling using the method of Lee-Low-Pines unitary transformation. We find that the binding energy varies in several tens of meV, depending on the polarizability of materials and the interlayer distance between double layers. Moreover, the correction of binding energy results in a remarkable increase of the critical temperature for the condensation of dilute excitonic gas basing on the Berezinskii-Kosterlitz-Thouless model. These results not only enrich the knowledge for the modulation of interlayer excitons, but also provide potential insights for the Bose-Einstein condensation and superfluid transport of interlayer excitons in two-dimensional heterostructures.Structure of the double layer consisting of different monolayer transition metal dichalcogenides (TMDS), that is called as van der Waals heterostucture, [1,2] provides an excellent platform to study the interlayer exciton physics, [3,4] in which an electron and a hole reside in different monolayers, bounded by attractive Coulomb interaction as illustrated in Figure 1(a). Due to the spatial charge separation, the recombination lifetimes of interlayer excitons are in the range of nanoseconds, several orders of magnitude longer than intralayer excitons shown in Figure 1(b). [5][6][7] More important is that optical properties of interlayer excitons can be easily modulated by some external ways, [4,[6][7][8][9][10][11] such as the gate voltage, temperature, and power of optical excitation, which provides an ideal candidate for realization of many excitonic devices, [3,12,13] such as excitonic photon storage, excitonic transistor, and excitonic light emission dipole. On the other hand, based on excitons are the nature of Bosonic particles, the Bose-Einstein condensation and superfluid transport of the dilute exciton gas in these double layers were proposed extensively in both recent experiments [13,14] and theories. [15][16][17][18][19] Of key importance to this species of exciton is its large binding energy, which determines above mentioned potential applications.Amount of experiments [20][21][22][23] and theories [17][18][19][22][23][24] have focused on the binding energies of interlayer excitons in different TMDS double layers in recent years. Wilson et al. deduced that the binding energy of interlayer exciton is large than 200 meV in MoSe 2 -WSe 2 heterobilayers by using rational device design and submicrometer angle-resolved photoemission spectroscopy in combination with photoluminescence. [20] But Mouri et al. found that the exciton binding energy is only 90 meV in MoS 2 -WSe 2 heterobilayers, determining from its thermal dissociation behavior. [21] The striking discrepancies between them can be attributed to the differences of the interlayer distance and the effective mass of exciton as theories predicted. Recently, Latini et al. developed the quantum electrostatic heterostructure model to calculate t...

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“…The near-K -point bands have a flat dispersion along the K − H axis, indicating that even in a multilayer structure, the corresponding quasi-particles are strongly confined within the individual layers and can be considered as effectively two-dimensional. Indeed, recent theoretical and experimental studies attribute the excitonic series in TMDC multilayer systems as being due to quasi twodimensional intra-and interlayer excitons [2,3].…”

Section: Introductionmentioning

confidence: 99%

Superradiant coupling effects in transition-metal dichalcogenides

Stroucken¹,

Stier²,

Paul³

et al. 2018

Optica

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Cooperative effects allow for fascinating characteristics in light-matter interacting systems. Here, we study naturally occurring superradiant coupling in a class of quasi-two-dimensional, layered semiconductor systems. We perform optical absorption experiments of the lowest exciton for transition-metal dichalcogenides with different numbers of atomic layers. We examine two representative materials, MoSe 2 and WSe 2 , using incoherent broadband white light. The measured transmission at the A exciton resonance does not saturate for optically thick samples consisting of hundreds of atomic layers, and the transmission varies nonmonotonously with the layer number. A self-consistent microscopic calculation reproduces the experimental observations, clearly identifying superradiant coupling effects as the origin of this unexpected behavior.

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Observation of interlayer excitons in MoSe2 single crystals

Cited by 73 publications

References 40 publications

Fine structure of K-excitons in multilayers of transition metal dichalcogenides

Fine structure of K-excitons in multilayers of transition metal dichalcogenides

Effect of Exciton–Phonon Coupling on the Interlayer Excitons in Transition Metal Dichalcogenides Double Layers

Superradiant coupling effects in transition-metal dichalcogenides

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