Radio Whisper of Dark Matter: A New Axion Detector ⚡ экспресс
SQWARE detectors have been proposed for the direct search for axion dark matter in the meV range. They consist of multiple semiconductor quantum wells forming magnetoplasmon resonators with a two-dimensional electron gas, where tunable resonances with near-zero permittivity (epsilon-near-zero) are achieved in the THz region. By orienting the resonator in the magnetic field, the frequency and axion-induced current are optimized, allowing mass scanning without mechanical tuning. The signal from the inverse Primakoff effect is radiated and picked up by a photodetector. Simulations and sensitivity estimates for realistic configurations show that SQWARE can probe the axion parameter space predicted by quantum chromodynamics, closing a crucial gap in direct experiments.
The new detector is a highly sensitive 'musical instrument.' Its heart is a layered material in a strong magnetic field. The layers form a resonator that amplifies the signal, much like the body of a cello amplifies the sound of a string. When an axion passes through the layers, the magnetic field makes it 'sing'—emitting a photon with a frequency depending on the axion's mass. To tune to this frequency, you simply tilt the device—no internal moving parts, like changing channels on an old TV. This method, akin to spectroscopy, allows scanning a wide range of masses in search of the elusive dark matter signal. Trillions of axions pass through the device every second—their energy could boil a kettle, but they barely interact. Only a few are caught, recorded by a supersensitive detector.
🎯 The name 'axion' was a joke by Nobel laureate [scientist:Frank Wilczek]Frank Wilczek[/scientist]: he used the brand of Axion laundry detergent because the new particle 'cleaned up' the theory's inconsistencies.