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OnderzoekVan Swinderen Institute

Dr. T. Elsaesser, Max-Born-Institute, Berlin: How atoms and charges move in crystals - x-ray diffraction in the femtosecond time domain

Roster

WhenWhere
15 November 2012 FWN-Building 5111.0080, Nijenborgh 4, 9747 AG, Groningen
Speaker: Dr. Thomas Elsaesser
Affiliation: Max-Born-Institute, Berlin
Title: How atoms and charges move in crystals - x-ray diffraction in the femtosecond time domain
Date: 15-11-2012
Start: 16.00 (Doors open and coffee available at 15.30)
Location: FWN-Building 5111.0080
Host: Thomas la Cour Jansen

Abstract

Numerous functional processes in condensed matter involve atomic motions and charge relocations on ultrashort time scales. X-ray diffraction methods with a femtosecond time resolution allow for spatially resolving transient structures and charge distributions in a most direct way, providing new insight into the structure-function relationship of crystalline materials. This talk combines an introduction into this research field with a discussion of recent results onstructural dynamics of ionic crystals. Experiments with laser-driven hard x-ray sources reveal the interplay of lattice and charge motions in the photoexcited prototype material KDP (KH2PO4).Upon elongation of the soft mode, a low-frequency lattice vibration, electrons are relocated over the length of a PO bond which is 100 times larger than the vibrational amplitude. As a second example, the field-driven transfer of valence electrons between ions in a superposition of quantum states of LiBH4 will be addressed.

Last modified:12 September 2014 11.21 a.m.