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A: Fachverband Atomphysik

A 2: Attosecond Science I (joint session A/MO)

A 2.4: Vortrag

Montag, 5. März 2018, 11:45–12:00, K 1.011

Light-Field-Driven Landau-Zener-Stückelberg interferometry — •Takuya Higuchi and Peter Hommelhoff — Department Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91058 Erlangen

When electrons are placed under an optical field which is stronger than the internal field inside of a matter, their dynamics turn into nonperturbative regime. Recently, we have observed a transition from perturbative to non-perturbative electron dynamics in graphene [1]. The electron dynamics in the non-perturbative regime are well described by the light-field-driven dynamics. In particular, this field-driven dynamics has the same form as repeated Landau-Zener transitions and resultant quantum-path interference around the touching points of graphene's electron bands, known as Landau-Zener-Stückelberg (LZS) interference.

Such Landau-Zener like dynamics are found in various physical systems. Therefore, a comprehensive understanding of this light-field-driven LZS interferometry can provide a general prescription for formulating strong-field dynamics. The purpose of this presentation is to clarify the relations between the parameters involved in this light-field-driven LZS interferometry. For example, we clarify the condition defining the perturbative and the non-perturbative regimes. Relations with strong-field physics in atomic gaseous systems, such as the non-adiabaticity parameter and the intensity parameter, will be discussed.

[1] T. Higuchi, C. Heide, K. Ullmann, H. B. Weber, and P. Hommelhoff, Nature 550, 224 (2017).