Universal conductivity and the electrodynamics of graphite at high pressures

Details Universal conductivity and the electrodynamics of graphite at high pressures Universal conductivity and the electrodynamics of graphite at high pressures

2011-11-04

arxiv.org/abs/1111.1126v1

Physics

Condensed Matter

Materials Science

5 pages, 4 figures

Scientific paper

We address the in-plane pressure-dependent electrodynamics of graphite through synchrotron based infrared spectroscopy and ab initio Density Functional Theory calculations. The Drude term remarkably increases upon pressure application, as a consequence of an enhancement of both electron and hole charge densities. This is due to the growth of the band dispersion along the k_z direction between the K and H points of the Brillouin zone. On the other hand, the mid-infrared optical conductivity between 800 and 5000 cm-1 is almost flat, and very weakly pressure dependent, at least up to 7 GPa. This demonstrates a surprising robustness of the graphene-like universal quantum conductance of graphite, even when the interlayer distance is significantly reduced.

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