Interlayer exciton polaritons in homobilayers of transition metal dichalcogenides

Koenig, J.; Fitzgerald, Jamie M.; Hagel, Joakim; Erkensten, Daniel; Malić, Ermin

doi:10.1088/2053-1583/acc1f5

Cited by 5 publications

(2 citation statements)

References 58 publications

(94 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Using a Wannier–Hopfield method, ,, we model the optical response of exciton-polaritons in TMD monolayers integrated within a Fabry–Perot cavity (Figure a). The excitonic landscape is obtained by solving the Wannier equation, − including DFT input on single-particle energies .…”

Section: Resultsmentioning

confidence: 99%

Revealing Dark Exciton Signatures in Polariton Spectra of 2D Materials

Ferreira,

Shan,

Rosati

et al. 2024

ACS Photonics

Self Cite

View full text Add to dashboard Cite

Dark excitons in transition metal dichalcogenides (TMDs) have been so far neglected in the context of polariton physics due to their lack of oscillator strength. However, in tungsten-based TMDs, dark excitons are known to be the energetically lowest states and could thus provide important scattering partners for polaritons. In this joint theoretical–experimental work, we investigate the impact of the full exciton energy landscape on polariton absorption and reflectance. By changing the cavity detuning, we vary the polariton energy relative to the unaffected dark excitons in such a way that we open or close specific phonon-driven scattering channels. We demonstrate both in theory and experiment that this controlled switching of scattering channels manifests in characteristic sharp changes in the optical spectra of polaritons. These spectral features can be exploited to extract the position of dark excitons. Our work suggests new possibilities for exploiting polaritons for fingerprinting nanomaterials via their unique exciton landscape.

show abstract

Section: Resultsmentioning

confidence: 99%

Revealing Dark Exciton Signatures in Polariton Spectra of 2D Materials

Ferreira,

Shan,

Rosati

et al. 2024

ACS Photonics

Self Cite

View full text Add to dashboard Cite

show abstract

“…In recent years, moiré heterobilayers based on monolayers of Transition Metal Dichalcogenides (TMDs) have emerged as an exciting playground for studying the excitonic Stark effect [1][2][3], orbitals and layer hybridization [4][5][6], as well as other related phenomena such as exciton-exciton interaction [7] and moiré polariton [8,9], etc. These complex structures are formed by stacking two TMDs monolayers with a slight rotational mismatch, creating a moiré pattern that dramatically alters the electronic properties.…”

Section: Introductionmentioning

confidence: 99%

Stark effect and orbitals hybridization of moir\'e interlayer exciton in $ MoSe{2}/ WSe{2} $ heterobilayer.

Hannachi,

Jaziri

2023

Preprint

View full text Add to dashboard Cite

We theoretically investigate the interlayer excitons response in the $WSe_{2}/MoSe_{2}$ heterobilayer under the effects of in-plane and out-of-plane static electric fields. We thoroughly analyze a wide range of properties pertaining to the interlayer exciton, including the binding energy, Stark shift, orbital hybridization, photoluminescence (PL) spectrum, and radiative lifetime. We examine various factors influencing interlayer exciton behavior, including the dielectric environment and the moir\'e traps effects. Our results demonstrate that the in-plane electric field significantly affects the binding energies of the interlayer exciton, leading to energy splitting between states with non-zero angular momentum, such as the $2p_{\pm}$ dark states. Furthermore, we show that the applied in-plane electric field results in orbitals hybridization of the interlayer exciton, including hybrid states such as $1s$, $2p_{\pm}$, and $2s$. In counterpart, we demonstrate that an out-of-plane electric field induced by a double-gate setup causes a quadratic Stark effect on the center of mass eigenenergies of the interlayer exciton and leads to energy splitting of degenerate states, result in an orbitals hybridization of center of mass eigenvectors. Finally, we determine the PL spectra and radiative lifetime of the moiré interlayer exciton as a function of electric field strength. Our results reveal that the $2p_{\pm}$ dark state becomes brighter through a one-photon PL process as the in-plane electric field strength increases. This phenomenon is directly attributed to the coupling between the $ns$ and $ np_{\pm} $ states generated by the in-plane electric field. In short, our investigation can help experimenters to designing novel optoelectronic applications, such as on-chip electro-optic modulators and TeraHertz devices.

show abstract

Dipolar many-body complexes and their interactions in stacked 2D heterobilayers

Sun,

Malic,

2024

Nat Rev Phys

View full text Add to dashboard Cite

Interlayer exciton polaritons in homobilayers of transition metal dichalcogenides

Cited by 5 publications

References 58 publications

Revealing Dark Exciton Signatures in Polariton Spectra of 2D Materials

Revealing Dark Exciton Signatures in Polariton Spectra of 2D Materials

Stark effect and orbitals hybridization of moir\'e interlayer exciton in $ MoSe{2}/ WSe{2} $ heterobilayer.

Dipolar many-body complexes and their interactions in stacked 2D heterobilayers

Contact Info

Product

Resources

About