Time Crystals Synchronize Across a Semiconductor
Physicists at TU Dortmund University have shown that multiple continuous time crystals inside a gallium arsenide semiconductor can lock their electron-nuclear spin oscillations to a shared frequency. The effect, reported in Nature Communications and highlighted on 24 September 2026, occurs when a broad laser beam illuminates separate regions, coupling oscillators up to 40 micrometers apart—more than 1,000 times the size of a single oscillator—via spin-polarized electron diffusion. This non-local synchronization produces a collective, stable rhythm without external periodic driving.
Time crystals are systems whose internal order repeats periodically in time even in the absence of a repeating external force. Earlier work by the same group demonstrated a single continuous time crystal that remained stable for hours at near absolute zero. Local material variations normally produce slightly different frequencies; simultaneous optical pumping overcomes that inhomogeneity through spin transport matching the electron diffusion length.
The precise mechanism of long-range coupling and its scalability remain open. Whether the synchronized state can be controlled or extended into functional spin networks for spintronic devices is still uncertain, and the cryogenic conditions limit immediate practical use. Further experiments will test whether larger arrays maintain coherence and whether the effect can be harnessed beyond laboratory settings.
Sources: ScienceDaily, Nature Communications, TU Dortmund University.
Lutetium Atomic Clock Sets New Accuracy Record
Researchers at Singapore’s Centre for Quantum Technologies have built an optical atomic clock based on a single charged lutetium-176 ion that achieves a systematic uncertainty of 1 × 10^{-19}, the lowest reported for any optical clock. Published in Nature on 23 September 2026 and covered the following day, two independent lutetium clocks agreed to 5.7 × 10^{-19} in direct comparison—the most precise clock-to-clock measurement yet. The team used a novel hyperfine-averaging technique to define the clock transition at 848 nm.
Optical atomic clocks measure time by locking a laser to an electron transition frequency. Conventional high-performance clocks rely on strontium, ytterbium or aluminum; lutetium had not previously been used for this purpose. The element’s properties confer exceptional stability against temperature and magnetic-field variations, allowing the device to maintain performance across extreme environmental ranges.
Verification across multiple laboratories is required before any redefinition of the second, and only one group currently operates lutetium clocks. Gravity-induced frequency shifts at the millimeter scale already appear in comparisons, underscoring the extreme sensitivity. Whether the architecture can be made portable or networked for practical metrology applications remains unresolved.
Sources: New Atlas, Nature, Centre for Quantum Technologies / National University of Singapore.
Ancient Meteorites Reveal Strong Early Solar Magnetic Field
MIT-led analysis of calcium-aluminum-rich inclusions (CAIs) inside the primitive Antarctic meteorite DOM 08006 shows that a magnetic field of 150–600 microteslas—three to twelve times Earth’s present field—existed in the solar nebula during the first 200,000 years of solar-system history. The paleomagnetic results, published in PNAS and reported on 24 September 2026, indicate magnetism helped transport gas and dust inward toward the forming Sun alongside gravity.
CAIs are the oldest known solid materials in the solar system. Their ferromagnetic minerals recorded the ambient field as they cooled. DOM 08006 preserves an unusually pristine record with minimal later alteration, allowing the team to isolate the ancient remanent magnetization. Earlier studies had established nebular fields at later epochs; this work pushes the evidence back to the pre-planetary disk stage.
Sample size is limited to a handful of inclusions from one meteorite, and laboratory heating risks oxidizing the carriers. The exact contribution of magnetism versus gravity, and how the field strength varied radially, remain model-dependent. Additional pristine CAIs will be needed to confirm the intensity and spatial extent of the early field.
Sources: ScienceDaily, PNAS, MIT News.