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Modifying the interlayer interaction in layered materials with an intense IR laser.

Yoshiyuki Miyamoto1, Hong Zhang2, Takehide Miyazaki1

  • 1Nanosystem Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Central 2, 1-1-1 Umezono, Tsukuba 305-8568, Japan.

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|April 4, 2015
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Summary

Researchers demonstrate transient interlayer compression in layered materials like hexagonal boron nitride (h-BN) using infrared laser pulses. This method induces an 11.3% contraction, opening new possibilities for nanospace chemistry and pressure-induced reactions.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Physical Chemistry

Background:

  • Layered materials possess unique properties due to their structure.
  • Controlling interlayer distances is crucial for applications in nanospace chemistry and catalysis.
  • Existing methods for interlayer manipulation are limited.

Purpose of the Study:

  • To propose and investigate a novel method for inducing transient interlayer compression in two-dimensional compound materials.
  • To explore the potential of infrared laser excitation for manipulating interlayer distances.
  • To demonstrate the feasibility of this approach using bilayer hexagonal boron nitride (h-BN) as a model system.

Main Methods:

  • Utilizing intense infrared (IR) laser irradiation resonant with the out-of-plane optical phonon mode (A(2u) mode).
  • Performing excited state molecular dynamics calculations based on time-dependent density functional theory (TD-DFT).
  • Simulating the dynamic response of bilayer h-BN to laser excitation.

Main Results:

  • Achieved an 11.3% transient interlayer contraction in bilayer h-BN.
  • Identified interlayer dipole-dipole attraction induced by the laser-pumped A(2u) mode as the mechanism for contraction.
  • The transient contraction was sustained for at least 1 picosecond (ps).

Conclusions:

  • The proposed IR laser-induced transient interlayer compression is effective for layered materials.
  • This technique offers a new pathway for controlling interlayer spacing in 2D materials.
  • The ability to induce and control interlayer distance could enable novel chemical reactions in nanospaces.