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Ultrafast Structural Dynamics Group

USDG research image
Time resolved x-ray diffraction experiment investigating evolution of strain in natural graphite. Experiment was performed at the Swiss Light Source (PHYSICAL REVIEW B 84, 045435). (a) Simulated c-axis strain dynamics in laser-excited graphite as function of time and depth. (b) Profile of the strain wave at 50 ps and 100 ps. (c) Comparison between measured x-ray rocking curves (red circles) and simulated x-ray rocking curves (black lines) of strained graphite.
Our group develops techniques for resolving ultrafast structural dynamics in matter at timescales that are fundamental to materials science and condensed matter physics. The techniques are based on exciting matter with light and probing the response of the lattice with electrons or x-rays. We are interested in a range of phenomena and systems including phase transformations induced by strong laser excitation, phase transformations in strongly correlated systems, generation and detection of coherent lattice vibrations, and characterization of materials properties of graphene, few-layer-graphene, ultra-thin graphite & nanocrystalline diamond. Our experiments are conducted both in-house (in our Ultrafast Electron Diffraction lab) or at x-ray user facilities (Max-lab in Lund-Sweden, and ESRF in Grenoble-France). We are also interested in developing nanofluidic devices to enable in situ imaging of liquid samples using electron microscopy.

Maher Harb 

Advisor

Maher Harb, PhD

Assistant Professor
Disque 807
215.895.1985
maher.harb@drexel.edu
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