Non-local synchronization of continuous time crystals in a semiconductor

Area of Science:

• Solid-state physics
• Quantum mechanics
• Spintronics

Background:

• Collective behavior and synchronization phenomena are observed in various coupled systems.
• Understanding long-range coupling mechanisms in solid-state systems is crucial for developing advanced electronic devices.

Purpose of the Study:

• To demonstrate synchronization in spatially remote, auto-oscillating electron-nuclear spin systems in a semiconductor.
• To identify the mechanism and range of coupling between these spin systems.

Main Methods:

• Utilizing optically pumped, auto-oscillating electron-nuclear spin systems in a semiconductor.
• Investigating the synchronization behavior of these systems at varying spatial separations (up to 40 μm).
• Correlating interaction distance with electron spin diffusion length.

Main Results:

• Spatially remote spin oscillators synchronized their frequencies over distances up to 40 μm.
• Synchronization failed at larger separations, indicating a finite interaction range.
• The coupling distance was found to match the electron spin diffusion length, confirming spin transport as the mediating mechanism.
• A wide-area optical pump induced synchronized behavior in an inhomogeneous ensemble of oscillators.

Conclusions:

• Spin transport mediates long-range coupling in semiconductor spin systems, enabling synchronization over mesoscopic distances.
• This synchronization leads to exceptional stability in auto-oscillations, crucial for collective motion in distributed spin systems.
• The findings pave the way for creating robust spin networks for future spintronics applications.