Photoinduced sp^3 Nanosize Domain with Frozen Shear Displacement in Graphite

• Authors: K. Nishioka , K. Nasu
• Languages of publication: EN

Abstracts

EN

A novel sp^3-bonded nanosize domain, known as a diaphite which is an intermediate state between a graphite and a diamond, is generated by the irradiation of visible laser pulse onto a graphite crystal. The sp^3 structure is well stabilized by shear displacement between neighboring graphite layers. We theoretically study the interlayer sp^3 bond formation with frozen shear displacement in a graphite crystal, using a classical molecular dynamics and a semi-empirical Brenner potential. We show that a pulse excitation under the fluctuation of shearing motion of carbons in an initial state can generate interlayer sp^3 bonds which freeze the shear, though no frozen shear appears if there is no fluctuation initially. Moreover, we investigate a pulse excitation under the coherent shearing motion and consequently obtain that the sp^3-bonded domain with frozen shear is efficiently formed. We conclude that the initial shear is important for the photoinduced sp^3 nanosize domain formation.

Keywords

EN

64.70.Nd; 61.48.Gh; 31.15.xv; 05.40.-a

Discipline

• 64.70.Nd: Structural transitions in nanoscale materials
• 61.48.Gh: Structure of graphene
• 31.15.xv: Molecular dynamics and other numerical methods(for simulation techniques for biomolecules, see 87.15.ak, ap)
• 05.40.-a: Fluctuation phenomena, random processes, noise, and Brownian motion(for fluctuations in superconductivity, see 74.40.-n; for statistical theory and fluctuations in nuclear reactions, see 24.60.-k; for fluctuations in plasma, see 52.25.Gj; for nonlinear dynamics and chaos, see 05.45.-a)

• Journal: Acta Physica Polonica A
• Year: 2012
• Volume: 121
• Issue: 2
• Pages: 350-354

Dates

published

2012-02

Contributors

author

K. Nishioka

• Institute for Molecular Science, Okazaki, Aichi 444-8585, Japan

author

K. Nasu

• Solid State Theory Division, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki, 305-0801, Japan

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Identifiers

DOI

10.12693/APhysPolA.121.350