Broadband and Resonant Approaches to Axion Dark Matter Detection
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PhysRevLett.117.141801.pdf
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276.5 KB
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Author(s)
Kahn, Yonatan
Safdi, Benjamin Ryan
Thaler, Jesse
Date Issued
September 2016
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Kahn, Yonatan, Benjamin R. Safdi, and Jesse Thaler. “Broadband and Resonant Approaches to Axion Dark Matter Detection.” Physical Review Letters 117.14 (2016): n. pag. © 2016 American Physical Society
Version
Final published version
Abstract
When ultralight axion dark matter encounters a static magnetic field, it sources an effective electric current that follows the magnetic field lines and oscillates at the axion Compton frequency. We propose a new experiment to detect this axion effective current. In the presence of axion dark matter, a large toroidal magnet will act like an oscillating current ring, whose induced magnetic flux can be measured by an external pickup loop inductively coupled to a SQUID magnetometer. We consider both resonant and broadband readout circuits and show that a broadband approach has advantages at small axion masses. We estimate the reach of this design, taking into account the irreducible sources of noise, and demonstrate potential sensitivity to axionlike dark matter with masses in the range of 10[superscript -14]-10[superscript -6] eV. In particular, both the broadband and resonant strategies can probe the QCD axion with a GUT-scale decay constant.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.117.141801
