Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 18: Plasmonics and Nanooptics II: Ultrafast and Nonlinear Phenomena (joint session O/CPP)

O 18.7: Vortrag

Montag, 16. März 2020, 16:45–17:00, WIL A317

Quantum Coherent Interference Paths in Interaction of Single-Electron Wavepackets with Light — •Nahid Talebi1 and Christoph Lienau21Institute für Experimentelle und Angewandte Physik, Christian Albrechts Universität zu Kiel, D-24118 Kiel, Deutschland — 2Institut für Physik and Center of Interface Science, Carl von Ossietzky Universität Oldenburg, D-26111 Oldenburg, Germany

Ultrafast coherent processes imposed by laser beams into a traveling electron wavepacket in an electron microscope modulate the phase and amplitude of the electron wavefunction (Near-Field Mediated Electron-Light Interactions, Springer Nature, Switzerland (2019)). As a result, electrons can be either accelerated (Nat. Phys. 14 121-5 (2018)), or diffracted (Proc. Camb. Phil. Soc. 29 297-300 (1923)). Particularly the latter, the so-called Kapitza-Dirac effect (KDE), is within the scope of current work. Here, with the aid of first-principle numerical calculations, we describe the physics of KDE. Moreover, we generalize the KDE into a combination of standing-wave and travelling-wave platforms (New J. Phys. 21 093016 (2019)). We show that by virtue of such generalizations, novel quantum-coherent interference paths are formed. Two competing parts of the interaction Hamiltonian, i.e., photon-absorption and emission processes as well as ponderomotive potential, contributes to these interference effects. These interference paths can be controlled by means of either laser or electron wavepacket parameters. Our investigations open up new directions in the domain of matter-wave interferometry.

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