Tunable Axion Plasma Haloscopes

Matthew Lawson, Alexander J. Millar, Matteo Pancaldi, Edoardo Vitagliano, Frank Wilczek

Research output: Contribution to journalArticlepeer-review

125 Scopus citations


We propose a new strategy for searching for dark matter axions using tunable cryogenic plasmas. Unlike current experiments, which repair the mismatch between axion and photon masses by breaking translational invariance (cavity and dielectric haloscopes), a plasma haloscope enables resonant conversion by matching the axion mass to a plasma frequency. A key advantage is that the plasma frequency is unrelated to the physical size of the device, allowing large conversion volumes. We identify wire metamaterials as a promising candidate plasma, wherein the plasma frequency can be tuned by varying the interwire spacing. For realistic experimental sizes, we estimate competitive sensitivity for axion masses of 35-400 μeV, at least.

Original languageEnglish (US)
Article number141802
JournalPhysical Review Letters
Issue number14
StatePublished - Oct 1 2019

ASJC Scopus subject areas

  • General Physics and Astronomy


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