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Magnetic Monopole Noise (Hardcover, 1st ed. 2021)
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Magnetic Monopole Noise (Hardcover, 1st ed. 2021)
Series: Springer Theses
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This thesis presents the first ever measurement of the noise
emitted by magnetic monopoles and the development of an exquisitely
sensitive magnetic-field-noise spectrometer based on a
superconducting quantum interference device (SQUID) that enabled
it. Magnetic monopoles are highly elusive elementary particles
exhibiting quantized magnetic charge. The prospects for studying
them brightened recently with the theoretical discovery that the
thermally excited states in certain classes of magnetic insulators
exhibit all the characteristics of magnetic monopoles. Furthermore,
in 2018, it was predicted that the random motion of magnetic
monopoles inside would generate a very specific kind of
magnetization noise. In this thesis, the author describes a new
experimental technique, so-called spin noise spectroscopy, and the
subsequent discovery of virtually all of the predicted features of
the magnetic noise expected from a dense fluid of magnetic
monopoles in crystals of Dy2Ti2O7. Remarkably, because this
magnetic monopole noise occurs in the frequency range below 20kHz,
when amplified by the SQUID it is actually audible to humans.
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