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Photonic axion insulator.
Science
January 2025
Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, Singapore.
Axions, hypothetical elementary particles that remain undetectable in nature, can arise as quasiparticles in three-dimensional crystals known as axion insulators. Previous implementations of axion insulators have largely been limited to two-dimensional systems, leaving their topological properties in three dimensions unexplored in experiment. Here, we realize an axion insulator in a three-dimensional photonic crystal and probe its topological properties.
View Article and Find Full Text PDFNew Upper Limit on the Axion-Photon Coupling with an Extended CAST Run with a Xe-Based Micromegas Detector.
Phys Rev Lett
November 2024
Physics Department, University of Patras, Patras, Greece.
Hypothetical axions provide a compelling explanation for dark matter and could be emitted from the hot solar interior. The CERN Axion Solar Telescope has been searching for solar axions via their back conversion to x-ray photons in a 9-T 10-m long magnet directed toward the Sun. We report on an extended run with the International Axion Observatory pathfinder detector, doubling the previous exposure time.
View Article and Find Full Text PDFSearch for Dark Matter Axions with Tunable TM_{020} Mode.
Phys Rev Lett
November 2024
Department of Physics, KAIST, Daejeon 34141, Republic of Korea.
Article Synopsis
- As the search frequency for axions increases, detection efficiency drops due to reduced cavity volume, although higher-order resonant modes could help maintain volume.
- A new tuning method using auxetic materials was introduced to improve detection, successfully applied to a specific mode, leading to new limits on axion-photon coupling strength in a targeted mass range.
New Constraints on Axion-Mediated Spin Interactions Using Magnetic Amplification.
Phys Rev Lett
November 2024
Helmholtz-Institut, GSI Helmholtzzentrum für Schwerionenforschung, Mainz 55128, Germany.
Article Synopsis
- Axions are theoretical particles that might explain dark matter and a specific physics problem (strong CP problem), and this study investigates their interactions using ^{129}Xe gas and Rb vapor.
- The method used enhances the detection sensitivity for these axion interactions by 145 times compared to traditional approaches through magnetic amplification and effective field exploitation.
- The research led to significant improvements in constraints on interactions related to axions, expanding the search for these particles and their potential links to dark matter, with implications for future investigations in this field.
Proposal for a Ramsey Neutron-Beam Experiment to Search for Ultralight Axion Dark Matter at the European Spallation Source.
Phys Rev Lett
November 2024
School of Physics, The University of Sydney, Sydney, New South Wales 2006, Australia.
Article Synopsis
- High-intensity neutron beams at the European Spallation Source (ESS) create new opportunities for fundamental research, particularly in the search for dark matter.
- A new Ramsey neutron-beam experiment aims to detect ultralight axion dark matter by examining its effects on neutron spins, which would rotate based on their interaction with the dark matter halo.
- This experiment, conducted at the HIBEAM beamline, is projected to increase the sensitivity of axion-neutron coupling measurements by 2-3 orders of magnitude across a specific mass range (10^{-22} eV to 10^{-16} eV).
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