Direct observation of optically induced transient structures in graphite using ultrafast electron crystallography

Details Direct observation of optically induced transient structures in graphite using ultrafast electron crystallography Direct observation of optically induced transient structures in graphite using ultrafast electron crystallography

2008-07-09

arxiv.org/abs/0807.1377v1

Physics

Condensed Matter

Materials Science

5 pages, 4 figures; to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.101.077401

We use ultrafast electron crystallography to study structural changes induced in graphite by a femtosecond laser pulse. At moderate fluences of ~< 21mJ/cm^2, lattice vibrations are observed to thermalize on a time scale of ~8ps. At higher fluences approaching the damage threshold, lattice vibration amplitudes saturate. Following a marked initial contraction, graphite is driven nonthermally into a transient state with sp^3-like character, forming interlayer bonds. Using ab initio density functional calculations, we trace the governing mechanism back to electronic structure changes following the photo-excitation.

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