Prediction of hyperbolic exciton-polaritons in monolayer black phosphorus

Wang, Fanjie; Wang, Chong; Chaves, Andrey; Song, Chaoyu; Zhang, Guowei; Huang, Shenyang; Lei, Yuchen; Xing, Qinghe; Mu, Lina; Xie, Yongjun; Yan, Hugen

doi:10.1038/s41467-021-25941-5

Cited by 39 publications

(37 citation statements)

References 52 publications

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“…The interplay between grating diffraction and material anisotropy enables unprecedented opportunities for directional, bidirectional, and unidirectional excitation and steering of ultraconfined polariton waves. The concept can be readily extended to other frequency ranges and other anisotropic materials (6,9,(29)(30)(31). We foresee that, beyond the grating orientation angle, other parameters (or degrees of freedom), including incident angle (32), polarization, and grating geometric structures, may be used to further control the polariton diffraction.…”

Section: Discussionmentioning

confidence: 99%

Unidirectionally excited phonon polaritons in high-symmetry orthorhombic crystals

Zhang

et al. 2022

Sci. Adv.

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Advanced control over the excitation of ultraconfined polaritons—hybrid light and matter waves—empowers unique opportunities for many nanophotonic functionalities, e.g., on-chip circuits, quantum information processing, and controlling thermal radiation. Recent work has shown that highly asymmetric polaritons are directly governed by asymmetries in crystal structures. Here, we experimentally demonstrate extremely asymmetric and unidirectional phonon polariton (PhP) excitation via directly patterning high-symmetry orthorhombic van der Waals (vdW) crystal α-MoO 3 . This phenomenon results from symmetry breaking of momentum matching in polaritonic diffraction in vdW materials. We show that the propagation of PhPs can be versatile and robustly tailored via structural engineering, while PhPs in low-symmetry (e.g., monoclinic and triclinic) crystals are largely restricted by their naturally occurring permittivities. Our work synergizes grating diffraction phenomena with the extreme anisotropy of high-symmetry vdW materials, enabling unexpected control of infrared polaritons along different pathways and opening opportunities for applications ranging from on-chip photonics to directional heat dissipation.

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Section: Discussionmentioning

confidence: 99%

Unidirectionally excited phonon polaritons in high-symmetry orthorhombic crystals

Zhang

et al. 2022

Sci. Adv.

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“…As graphene physics matured, the interest in other 2D materials grew and novel physical properties were found. The existence of correlated phases in twisted graphene layers, [16][17][18][19][20][21] valley physics and excitons in TMDs, [3,[22][23][24][25][26][27] 2D superconductivity, [28][29][30][31][32] 2D magnetic materials, and the myriad of heterostructures made of these materials has created a new and exciting research field in condensed matter physics and materials science alike.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Methods for Excitonic Physics in 2D Materials

Quintela

Henriques

Tenório

et al. 2022

Physica Status Solidi (b)

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In this Perspective article, the reader is introduced to several theoretical methods of determining the exciton wave functions and the corresponding eigenenergies. The methods covered are either analytical, semianalytical, or numeric. All the details associated with the different methods are made explicit, thus allowing newcomers to do research on their own, without experiencing a steep learning curve. The Perspective starts with a variational method and ends with a simple semianalytical approach to solve the Bethe–Salpeter equation (BSE) in gapped 2D materials. For the first methods addressed in this Perspective, the authors focus on a single layer of hexagonal boron nitride (hBN) and of transition metal dichalcogenide (TMD), as these are exemplary materials in the field of 2D excitons. For explaining the Bethe–Salpeter method, the biased bilayer graphene, which presents a tunable bandgap is chosen. The system has the right amount of complexity (without being excessive). This allows the presentation of the solution in a context that can be easily generalized to more complex systems or to apply it to simpler models.

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“…In some materials a distortion of the planar hexagonal lattice, such as in ReS 2 , leads to biaxial anisotropy with different values of the in-plane permittivity tensor elements, i.e. ε xx = ε yy and both being different from the out-of-plane ε zz [15][16][17]. Nonlinear optical properties of multilayer TMDs, such as second-harmonic genera-tion (SHG), also attract research attention [5,18,19].…”

Section: Introductionmentioning

confidence: 99%

Nanostructured transition metal dichalcogenide multilayers for advanced nanophotonics

Munkhbat¹,

Küçüköz²,

Baranov³

et al. 2022

Preprint

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Transition metal dichalcogenides (TMDs) attract significant attention due to their exceptional optical, excitonic, mechanical, and electronic properties. Nanostructured multilayer TMDs were recently shown to be highly promising for nanophotonic applications, as motivated by their exceptionally high refractive indexes and optical anisotropy. Here, we extend this vision to more sophisticated structures, such as periodic arrays of nanodisks and nanoholes, as well as proof-ofconcept waveguides and resonators. We specifically focus on various advanced nanofabrication strategies, including careful selection of resists for electron beam lithography and etching methods. The specific materials studied here include semiconducting WS 2 , in-plane anisotropic ReS 2 , and metallic TaSe 2 , TaS 2 and NbSe 2 . The resulting nanostructures can potentially impact several nanophotonic and optoelectronic areas, including high-index nanophotonics, plasmonics and on-chip optical circuits. The knowledge of TMD material-dependent nanofabrication parameters developed here will help broaden the scope of future applications of these materials in all-TMD nanophotonics.

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Prediction of hyperbolic exciton-polaritons in monolayer black phosphorus

Cited by 39 publications

References 52 publications

Unidirectionally excited phonon polaritons in high-symmetry orthorhombic crystals

Unidirectionally excited phonon polaritons in high-symmetry orthorhombic crystals

Theoretical Methods for Excitonic Physics in 2D Materials

Nanostructured transition metal dichalcogenide multilayers for advanced nanophotonics

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