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TT: Fachverband Tiefe Temperaturen
TT 84: Focus Session: Emerging Magnetic Phenomena from Chiral Phonons II (joint session MA/TT)
TT 84.7: Talk
Friday, March 22, 2024, 11:00–11:15, H 1058
Chiral phonons as dark matter detectors — •Carl Romao1, Riccardo Catena2, Nicola Spaldin1, and Marek Matas1 — 1Department of Materials, ETH Zurich, CH-8093 Zurich, Switzerland — 2Department of Physics, Chalmers University of Technology, SE-412 96 Goteborg, Sweden
We have proposed a method for detecting single chiral phonons using magnetometers. This would allow chiral phonons to be used as dark-matter detectors capable of exploring a multitude of unprobed dark-matter candidates. Metal*organic frameworks are potential candidate detector materials, as their flexibility yields low-energy chiral phonons with measurable magnetic moments, and their anisotropy leads to directional sensitivity, which mitigates background contamination. InF3(4,4'-bipyridine) has been identified as a candidate material; sensing of its phonon magnetic moments would extend detector reach by orders of magnitude below current limits.
Keywords: Phonons; Chiral phonons; Phonon magnetism; Dark matter; Density functional theory