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Attosecond-scale absorption at extreme intensities

Savin, A. F. and Ross, A. J. and Serzans, M. and Trines, R. M. G. M. and Ceurvorst, L. and Ratan, N. and Spiers, B. and Bingham, R. and Robinson, A. P. L. and Norreys, P. A. (2017) Attosecond-scale absorption at extreme intensities. Physics of Plasmas, 24 (11). ISSN 1070-664X

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    A novel non-ponderomotive absorption mechanism, originally presented by Baeva et al. in one dimension, is extended into higher dimensions for the first time. This absorption mechanism, the Zero Vector Potential (ZVP), is expected to dominate the interactions of ultra-intense laser pulses with critically over-dense plasmas such as those that are expected with the Extreme Light Infrastructure laser systems. It is shown that the mathematical form of the ZVP mechanism and its key scaling relations found by Baeva et al. in 1D are identically reproduced in higher dimensions. The two dimensional particle-in-cell simulations are then used to validate both the qualitative and quantitative predictions of the theory.