Dresden 2017 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 6: Ultrafast Phenoma I

HL 6.9: Vortrag

Montag, 20. März 2017, 12:15–12:30, POT 51

Ultrafast transmission electron microscopy using laser-triggered field emitters — •Thomas Danz, Armin Feist, Nora Bach, Nara Rubiano da Silva, Marcel Möller, Sascha Schäfer, and Claus Ropers — IV. Physical Institute – Solids and Nanostructures, University of Göttingen, Germany

Ultrafast transmission electron microscopy (UTEM) is a promising approach to investigate ultrafast processes with nanometer spatial resolution [1]. Using the versatile imaging, diffraction, and spectroscopy capabilities of such an instrument, structural, electronic, and magnetic dynamics can be probed in a laser pump/electron probe scheme [2].

The pulsed electron source of the Göttingen UTEM project employs linear photoemission from a nanoscopic Schottky emitter, delivering highly coherent electron pulses with down to 200 fs pulse duration, 0.6 eV energy width, and sub-1 nm focused beam diameter [3]. We present first applications, as well as prospects and challenges of the UTEM in ultrafast electron imaging, diffraction, energy loss spectroscopy (EELS), and holography, and discuss approaches to reversibly drive electronic and structural phase transitions in inhomogeneous systems.
[1] A. H. Zewail, Science 328, 187 (2010)

[2] A. Feist et al., in preparation

[3] A. Feist et al., arXiv:1611.05022