What is it about?
How 2D materials change under pressure depends heavily on how they are stacked, yet a complete "map" of this relationship has been missing. We filled this gap by testing bilayer MoS2 across all major stacking angles(0°，10°，20°，30°，40°，50°，60°）. Using Raman spectroscopy, we found that different stacks react differently to pressure, revealed a new hidden phase, and discovered a unique chevron pattern between transition pressure and stacking angle. This work provides a comprehensive phase diagram that helps us better understand and predict the behavior of 2D materials under extreme conditions.
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Why is it important?
By integrating stacking angles into a detailed phase diagram, this work provides a new understanding of how 2D materials evolve under pressure. Our study reveals that the stacking angle is a critical determinant of phase behavior, uncovering a unique metastable phase and a chevron-shaped transition pattern, which fills a long-standing research gap by resolving how stacking configurations mediate atomic rearrangements under pressure. Beyond its fundamental insights, our findings demonstrate that stacking manipulation is a powerful tool for engineering metastable phases, providing a new roadmap for exploring non-equilibrium states in 2D material systems.
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Jiaze Qin
University of Electronic Science and Technology of China
Read the Original
This page is a summary of: Completing the stacking–pressure phase diagram in bilayer MoS
2, Nano Research, March 2026, Tsinghua University Press,
DOI: 10.26599/nr.2025.94908129.
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