Abstract
Few-layer two-dimensional (2D) materials usually have different (meta)-stable stacking patterns, which have distinct electronic and optical properties. Inspired by optical tweezers, we show that a laser with selected frequency can modify the generalized stacking-fault energy landscape of bilayer hexagonal boron nitride (BBN), by coupling to the slip-dependent dielectric response. Consequently, BBN can be reversibly and barrier-freely switched between its stacking patterns in a controllable way. We simulate the dynamics of the stacking transition with a simplified equation of motion and demonstrate that it happens at picosecond timescale. When one layer of BBN has a nearly-free surface boundary condition, BBN can be locked in its metastable stacking modes for a long time. Such a fast, reversible and non-volatile transition makes BBN a potential media for data storage and optical phase mask.
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This work was supported by an Office of Naval Research MURI through grant #N00014-17-1-2661.
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Xu, H., Zhou, J., Li, Y. et al. Optomechanical control of stacking patterns of h-BN bilayer. Nano Res. 12, 2634–2639 (2019). https://doi.org/10.1007/s12274-019-2500-y
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DOI: https://doi.org/10.1007/s12274-019-2500-y