Quantum 2025 – scientific programme

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MON: Monday Contributed Sessions

MON 23: Poster Session: Fundamental Aspects and Model Systems

MON 23.39: Poster

Monday, September 8, 2025, 18:30–20:30, ZHG Foyer 1. OG

Towards low-energy structured coherent electron and ion beams — •Prosenjit Majumder, Matias Eriksson, and Robert Fickler — Physics Unit, Photonics Laboratory, Tampere University, Tampere, Finland

In recent years, structured matter waves particularly structured electron beams have attracted growing interest due to their potential in advanced microscopy and quantum experiments. Spatially coherent field-emission electron sources are well-established, enabling precise control over electron beam wavefronts and facilitating developments in electron microscopy and spectroscopy. Our research focuses on developing a tunable low-energy source capable of structuring both electron and ion beams. The setup features a cryogenically cooled nanotip field/gas field ion emission source followed by a 2-meter free propagation region. This configuration is designed to generate transversely coherent beams, with coherence lengths of several micrometers for ions suitable for shaping with nanofabricated electrostatic elements.

We aim to investigate the physics of low-energy vortex electrons and ions using electrostatic chopsticks as a minimally invasive shaping tool. Housed in a custom-built vacuum chamber, the setup includes electrostatic lenses, deflectors, and full-length magnetic shielding to suppress ambient magnetic interference. Realizing a spatially coherent ion source would mark a major advance, enabling new studies in composite charged wave systems and pushing the frontiers of ion-based microscopy and quantum technologies.

Keywords: Field emission; vortex electrons and ions; Structured ions; Chopsticks; Advanced microscopy