An efficient material search for room temperature topological magnons

Karaki, Mohammed J.; Xu, Yang; Williams, Archibald J.; Nawwar, Mohamed; Doan-Nguyen, Vicky; Goldberger, Joshua E.; Lu, Yue

doi:10.48550/arxiv.2206.06248

Cited by 2 publications

(1 citation statement)

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“…[71] has proposed new methods to discover phononic materials, and Ref. [72] considered topological magnon materials. Similar efforts for phonon-polaritons may prove useful.…”

Section: Discussionmentioning

confidence: 99%

Axion detection with phonon-polaritons revisited

Marsh,

McDonald,

Millar

et al. 2022

Preprint

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In the presence of a background magnetic field, axion dark matter induces an electric field and can thus excite phonon-polaritons in suitable materials. We revisit the calculation of the axion-photon conversion power output from such materials, accounting for finite volume effects, and material losses. Our calculation shows how phonon-polaritons can be converted to propagating photons at the material boundary, offering a route to detecting the signal. Using the dielectric functions of GaAs, Al2O3, and SiO2, a fit to our loss model leads to a signal of lower magnitude than previous calculations. We demonstrate how knowledge of resonances in the dielectric function can directly be used to calculate the sensitivity of any material to axion dark matter. We argue that a combination of low losses encountered at O(1) K temperatures and near future improvements in detector dark count allow one to probe the QCD axion in the mass range ma ≈ 100 meV. This provides further impetus to examine novel materials and further develop detectors in the THz regime. We also discuss possible tuning methods to scan the axion mass.

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“…[71] has proposed new methods to discover phononic materials, and Ref. [72] considered topological magnon materials. Similar efforts for phonon-polaritons may prove useful.…”

Section: Discussionmentioning

confidence: 99%