Optomechanical control of stacking patterns of h-BN bilayer
Author(s)Xu, Haowei; Zhou, Jian; Li, Yifei; Jaramillo, Rafael; Li, Ju
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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. [Figure not available: see fulltext.].
DepartmentMassachusetts Institute of Technology. Department of Nuclear Science and Engineering; Massachusetts Institute of Technology. Department of Materials Science and Engineering
Springer Science and Business Media LLC
Xu, Haowei et al. "Optomechanical control of stacking patterns of h-BN bilayer." Nano Research 12, 10 (August 2019): 2634–2639 © 2019 Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature
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