Community Research and Development Information Service - CORDIS



Project ID: 616823
Funded under: FP7-IDEAS-ERC
Country: Germany

Mid-Term Report Summary - NEARFIELDATTO (Attosecond physics at nanoscale metal tips - strong field physics in the near-field optics regime)

The ERC Consolidator Project "NearFieldAtto" has achieved a number of results around the control of electrons with the help of femtosecond laser pulses. These electrons are either photo-emitted from needle tips, or are electrons inside of the two-dimensional material graphene. In both cases, entirely new ways of controlling these electrons on femtosecond timescales (1fs = 10^(-15) s = 1 millionth of a billionth of a second) could be demonstrated. In the tip case, we could show that we can steer electron emission fully coherently with the help of a second harmonic of the driving field, leading to coherent quantum path interferece between two emission pathways. A stunningly large emission current variation of more than 95% could be observed when the time delay between fundamental and weak second harmonic was varied. This work will be of interest for laser-triggered electron sources and also for light-field driven electronics. In the case of graphene, we could observe a qualitatively new way of generating an optical-phase dependent persistent current. Based on multiple Landau-Zener transitions of the optically driven electrons, we could observe an interference effect that leads to a phase sensitive generation of conduction band population. This effect is called Landau-Zener-Stückelberg interferometry and has been observed for the first time in a regular (yet 2-d) material.

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