Climate

Scaling Laws for Climate Model Emulation

Salva Rühling Cachay, Brian Henn

Featured May 23, 2026

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Simply

Scientists found a special 'dark' light-emitting particle in twisted layers of material that moves surprisingly far and keeps its quantum 'spin direction' better than normal particles, which could be useful for future tiny electronics.

In depth

The paper uncovers a brightened dark exciton in large-angle twisted molybdenum diselenide homobilayers, which typically lack the periodic Moiré superlattice effects. This dark exciton is found to be significantly more diffusive than its bright counterparts and exhibits robust valley coherence, a surprising property attributed to spin-mixing caused by broken out-of-plane reflection symmetry in the bilayer structure.

Key Takeaways

1
The study identifies a brightened dark intralayer exciton in large-angle twisted MoSe $_{2}$ homobilayers, which is usually optically suppressed in monolayers.
2
This brightened dark exciton demonstrates enhanced diffusion, with lengths exceeding 4 microns, making it more mobile than bright excitons or trions.
3
The dark exciton exhibits robust valley coherence due to spin-mixing from broken symmetry, opening new avenues for valleytronic device applications.

Conceptual Flow

HIGH LEVEL

Methodology: Finding Hidden Particles

The scientists stacked two thin material sheets, twisted them, and then shone light on them to see how far different types of tiny light-emitting particles traveled.

Two Material Sheets

Twist and Stack

Shine Light, Measure Glow

Particle Movement Data

Particle Light Colors

Results: A Special Moving Particle

They discovered a 'dark' particle that usually doesn't glow much, but here it glowed, moved very far, and kept its special quantum property, unlike other particles.

Normal Particles

New Dark Particle

Compare Movement & Spin

Normal: Moves Little, Loses Spin

Dark: Moves Far, Keeps Spin