Gate tunable light-matter interaction in natural biaxial hyperbolic van der Waals heterostructures

Bapat, Aneesh; Dixit, Saurabh Kumar; Gupta, Yashika; Low, Tony; Kumar, Adepu

doi:10.48550/arxiv.2110.07526

Cited by 2 publications

(2 citation statements)

References 51 publications

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“…It should be noted that, in the preparation for revisions of our paper, we became aware of other papers reporting the tunable phonon polaritons in graphene-covered α-MoO 3 heterostructures. − Our work was conducted separately.…”

Section: Discussionmentioning

confidence: 99%

Tailoring Topological Transitions of Anisotropic Polaritons by Interface Engineering in Biaxial Crystals

Zeng

Liu

et al. 2022

Nano Lett.

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Polaritons in polar biaxial crystals with extreme anisotropy offer a promising route to manipulate nanoscale light−matter interactions. The dynamic modulation of their dispersion is of great significance for future integrated nano-optics but remains challenging. Here, we report tunable topological transitions in biaxial crystals enabled by interface engineering. We theoretically demonstrate such tailored polaritons at the interface of heterostructures between graphene and α-phase molybdenum trioxide (α-MoO 3 ). The interlayer coupling can be modulated by both the stack of graphene and α-MoO 3 and the magnitude of the Fermi level in graphene enabling a dynamic topological transition. More interestingly, we found that the wavefront transition occurs at a constant Fermi level when the thickness of α-MoO 3 is tuned. Furthermore, we also experimentally verify the hybrid polaritons in the graphene/α-MoO 3 heterostructure with different thicknesses of α-MoO 3 . The interface engineering offers new insights into optical topological transitions, which may shed new light on programmable polaritonics, energy transfer, and neuromorphic photonics.

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Section: Discussionmentioning

confidence: 99%

Tailoring Topological Transitions of Anisotropic Polaritons by Interface Engineering in Biaxial Crystals

Zeng

Liu

et al. 2022

Nano Lett.

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“…We note that during the proofreading we became aware of a related preprint. 41 ■ ASSOCIATED CONTENT * sı Supporting Information…”

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confidence: 99%

Active Tuning of Highly Anisotropic Phonon Polaritons in Van der Waals Crystal Slabs by Gated Graphene

et al. 2022

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Phonon polaritons (PhPs)lattice vibrations coupled to electromagnetic fieldsin highly anisotropic media display a plethora of intriguing optical phenomena, including ray-like propagation, anomalous refraction, and topological transitions, among others, which have potential for unprecedented manipulation of the flow of light at the nanoscale. However, the properties of these PhPs are intrinsically dictated by the anisotropic crystal structure of the host material. Although in-plane anisotropic PhPs can be steered, and even canalized, by twisting individual crystal slabs in a van der Waals (vdW) stack, active control of their propagation via external stimuli presents a significant challenge. Here, we report on a technology in which anisotropic PhPs supported by biaxial vdW slabs are actively tuned by simply gating an integrated graphene layer. Excitingly, we predict active tuning of optical topological transitions, which enable controlling the canalization of PhPs along different in-plane directions in twisted heterostructures. Apart from their fundamental interest, our findings hold promises for the development of optoelectronic devices (sensors, photodetectors, etc.) based on PhPs with dynamically controllable properties.

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Gate tunable light-matter interaction in natural biaxial hyperbolic van der Waals heterostructures

Cited by 2 publications

References 51 publications

Tailoring Topological Transitions of Anisotropic Polaritons by Interface Engineering in Biaxial Crystals

Tailoring Topological Transitions of Anisotropic Polaritons by Interface Engineering in Biaxial Crystals

Active Tuning of Highly Anisotropic Phonon Polaritons in Van der Waals Crystal Slabs by Gated Graphene

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