Electron spin diffusion synchronizes distant time crystals in a semiconductor
Researchers at TU Dortmund University have shown that separate time crystals formed in the same semiconductor can synchronize their oscillations, locking to a common frequency even when they are up to about 40 micrometers apart. The team identified the diffusion of spin-polarized electrons as the coupling mechanism. It suggests the effect could serve as a basis for networks of coupled spin oscillators in spintronic devices.
A continuous time crystal is a system that oscillates spontaneously and persistently under constant driving, rather than in response to a periodic external signal. In 2024, the same group reported such a time crystal in an electron-nuclear spin system inside an indium gallium arsenide (InGaAs) semiconductor, with oscillations that remained stable for hours. The material is a 10 μm-thick InGaAs layer containing 3% indium and doped with silicon. Each electron bound to a silicon donor interacts with roughly a million surrounding nuclear spins and forms a single oscillator. A circularly polarized pump laser aligns the electron spins, which pass their polarization to the nuclei. The resulting nuclear magnetic field then acts back on the electrons, sustaining the oscillation, which a second laser reads out. The experiments were carried out at about 6 K.
Source: https://www.spintronics-info.com/electron-spin-diffusion-synchronizes-distant-time-crystals-semiconductor
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