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2018-01-09
10:44
OpenAccess [PUBDB-2018-00272] Journal Article
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Ultrashort Free-Electron Laser X-ray Pulses
ddc:600
For the investigation of processes happening on the time scale of the motion of bound electrons, well-controlled X-ray pulses with durations in the few-femtosecond and even sub-femtosecond range are a necessary prerequisite. Novel free-electron lasers sources provide these ultrashort, high-brightness X-ray pulses, but their unique aspects open up concomitant challenges for their characterization on a suitable time scale [...]
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2017-09-07
07:32
Embargoed OpenAccess [PUBDB-2017-10446] Journal Article
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Coherent Enantiomer-Selective Population Enrichment Using Tailored Microwave Fields
ddc:540
We report the experimental demonstration of coherent enantiomer-selective enrichment of chiral molecules by employing a novel microwave five-pulse scheme. Our results show that enantiomers can be selectively transferred to a rotational level of choice by applying sequences of resonant microwave pulses in a phase- and polarization-controlled manner. [...]
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2017-08-29
10:31
OpenAccess [PUBDB-2017-10022] Journal Article
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Compression of high-density 0.16 pC electron bunches through high field gradients for ultrafast single shot electron diffraction: The Compact RF Gun
ddc:530
We present an RF gun design for single shot ultrafast electron diffraction experiments that can produce sub-100 fs high-charge electron bunches in the 130 keV energy range. Our simulations show that our proposed half-cell RF cavity is capable of producing 137 keV, 27 fs rms (60 fs FWHM), 106 electron bunches with an rms spot size of 276 μm and a transverse coherence length of 2.0 nm. [...]
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2017-08-29
10:24
OpenAccess [PUBDB-2017-10018] Journal Article
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Creating stable Floquet–Weyl semimetals by laser-driving of 3D Dirac materials
ddc:500
Tuning and stabilizing topological states, such as Weyl semimetals, Dirac semimetals or topological insulators, is emerging as one of the major topics in materials science. Periodic driving of many-body systems offers a platform to design Floquet states of matter with tunable electronic properties on ultrafast timescales. [...]
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2017-08-29
10:21
OpenAccess [PUBDB-2017-10017] Journal Article
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Simultaneous control of magnetic topologies for reconfigurable vortex arrays
ddc:500
The topological spin textures in magnetic vortices in confined magnetic elements offer a platform for understanding the fundamental physics of nanoscale spin behavior and the potential of harnessing their unique spin structures for advanced magnetic technologies. For magnetic vortices to be practical, an effective reconfigurability of the two topologies of magnetic vortices, that is, the circularity and the polarity, is an essential prerequisite. [...]
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2017-04-21
10:55
OpenAccess [PUBDB-2017-01767] Journal Article
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Multiple Supersonic Phase Fronts Launched at a Complex-Oxide Heterointerface
ddc:550
Selective optical excitation of a substrate lattice can drive phase changes across heterointerfaces. This phenomenon is a nonequilibrium analogue of static strain control in heterostructures and may lead to new applications in optically controlled phase change devices [...]
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2016-11-30
10:41
OpenAccess [PUBDB-2016-05742] Journal Article
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Single-shot diffraction data from the Mimivirus particle using an X-ray free-electron laser
ddc:610
Free-electron lasers (FEL) hold the potential to revolutionize structural biology by producing X-ray pules short enough to outrun radiation damage, thus allowing imaging of biological samples without the limitation from radiation damage. Thus, a major part of the scientific case for the first FELs was three-dimensional (3D) reconstruction of non-crystalline biological objects. [...]
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2016-08-22
10:42
OpenAccess [PUBDB-2016-03283] Journal Article
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High-Field High-Repetition-Rate Sources for the Coherent THz Control of Matter
ddc:000
Ultrashort flashes of THz light with low photon energies of a few meV, but strong electric or magneticfield transients have recently been employed to prepare various fascinating nonequilibrium statesin matter. Here we present a new class of sources based on superradiant enhancement of radiationfrom relativistic electron bunches in a compact electron accelerator that we believe will revolutionizeexperiments in this field. [...]
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2016-08-22
10:24
OpenAccess [PUBDB-2016-03265] Journal Article
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Coupled Motion of Xe Clusters and Quantum Vortices in He Nanodroplets
ddc:530
Single He nanodroplets doped with Xe atoms are studied via ultrafast coherent x-ray diffraction imaging. The diffraction images show that rotating He nanodroplets about 200 nm in diameter contain a small number of symmetrically arranged quantum vortices decorated with Xe clusters. [...]
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2016-08-22
10:05
OpenAccess [PUBDB-2016-03250] Journal Article
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Stimulated x-ray Raman Scattering – a critical assessment of the building block of nonlinear x-ray spectroscopy
ddc:540
With the invention of femtosecond X-ray free-electron lasers (XFELs), studies of light-induced chemical reaction dynamics and structural dynamics reach a new era, allowing for time-resolved X-ray diffraction and spectroscopy. To ultimately probe coherent electron and nuclear dynamics on their natural time and length scales, coherent nonlinear X-ray spectroscopy schemes have been proposed. [...]
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