Science

Twisted atomic layers slide spontaneously at room temperature in simulations

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Briefings

Researchers discovered that twisted bilayer MoS2 moiré superlattices can slide spontaneously at room temperature via domain walls, with sulfur-vacancy concentrations as low as 0.1% triggering localized oscillations. This represents a new ultralow-barrier mechanism for interlayer motion, challenging previous assumptions about energy requirements for such sliding.

Key points

• Twisted bilayer MoS2 moiré superlattices exhibit spontaneous long-range interlayer sliding at room temperature mediated by domain walls.
• Sulfur-vacancy concentrations of approximately 0.1% are sufficient to induce localized oscillations in the sliding motion.

Context

This finding challenges established models of interlayer friction in transition metal dichalcogenides, suggesting that structural defects and domain configurations can enable room-temperature sliding without significant energy barriers.

Limitations

The study relies on computational simulations rather than experimental validation. The specific defect concentration threshold of 0.1% remains a calculated estimate based on current modeling, and the long-range nature of the sliding mechanism requires further physical verification.

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