Hannover 2016 – scientific programme

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A: Fachverband Atomphysik

A 35: Attosecond physics

A 35.1: Invited Talk

Thursday, March 3, 2016, 14:30–15:00, f107

History and current status of the Keldysh theory — •Sergey Popruzhenko — National Research Nuclear University MEPhI, Kashirskoe shosse 31, 115409, Moscow, Russia

This talk presents an overview of the Keldysh theory of strong field ionization. The historic development and applications of this analytic model of nonlinear ionization of atoms and solids by intense laser radiation proposed by L.V. Keldysh in his seminal work [1] more than 50 years ago are briefly described. The relationship between the Keldysh theory and other analytic approaches to the problem of strong field ionization, including the famous Strong Field Approximation [2,3] is discussed. Special attention is paid to open questions and to those aspects of the theory, which remain actively debated or frequently receive erroneous interpretations. This includes in particular the conditions of applicability, the problem of gauge invariance and the concept of the tunneling time. Finally, prospects for the future development of the theory are outlined.

[1] L.V. Keldysh, Sov. Phys. JETP 20, 1307 (1965).

[2] F.H.M. Faisal, J. Phys. B: At. Mol. Opt. Phys. 6, L89 (1973).

[3] H.R. Reiss, Phys. Rev. A 22, 1786 (1980).