title: Collective lipid bilayer dynamics excited by surface acoustic waves.
abstract: We use standing surface acoustic waves to induce coherent phonons in model lipid multilayers deposited on a piezoelectric surface. Probing the structure by phase-controlled stroboscopic x-ray pulses we find that the internal lipid bilayer electron density profile oscillates in response to the externally driven motion of the lipid film. The structural response to the well-controlled motion is a strong indication that bilayer structure and membrane fluctuations are intrinsically coupled, even though these structural changes are averaged out in equilibrium and time integrating measurements. Here the effects are revealed by a timing scheme with temporal resolution on the picosecond scale in combination with the sub-nm spatial resolution, enabled by high brilliance synchrotron x-ray reflectivity.
authors.affiliation: Institut für Röntgenphysik, University of Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Reusch
authors.affiliation: Lehrstuhl für Experimentalphysik I, Universität Augsburg, Universitätsstr. 1, 86159 Augsburg, Germany and Nanosystems Initiative Munich, Schellingstrasse 4, 80799 Munich, Germany.
authors.forename: F J R
authors.initials: FJ
authors.lastname: Schülein
authors.affiliation: Institut für Röntgenphysik, University of Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany.
authors.forename: J D
authors.initials: JD
authors.lastname: Nicolas
authors.affiliation: Institut für Röntgenphysik, University of Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Osterhoff
authors.affiliation: Deutsches Elektronen-Synchrotron, Notkestrasse 85, 22605 Hamburg, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Beerlink
authors.affiliation: Lehrstuhl für Experimentalphysik I, Universität Augsburg, Universitätsstr. 1, 86159 Augsburg, Germany and Nanosystems Initiative Munich, Schellingstrasse 4, 80799 Munich, Germany.
authors.forename: H J
authors.initials: HJ
authors.lastname: Krenner
authors.affiliation: Institut für Theoretische Physik, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Müller
authors.affiliation: Lehrstuhl für Experimentalphysik I, Universität Augsburg, Universitätsstr. 1, 86159 Augsburg, Germany and Nanosystems Initiative Munich, Schellingstrasse 4, 80799 Munich, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Wixforth
authors.affiliation: Institut für Röntgenphysik, University of Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Salditt