Share This Author
XFEL: The European X-Ray Free-Electron Laser - Technical Design Report
Massimo Altarelli, Reinhard Brinkmann, Majed Chergui, Winfried Decking, Barry Dobson, Stefan Düsterer, Gerhard Grübel, Walter Graeff, Heinz Graafsma, Janos Hajdu, Jonathan Marangos, Joachim Pflüger,…
The Gravitational Universe
The last century has seen enormous progress in our understanding of the Universe. We know the life cycles of stars, the structure of galaxies, the remnants of the big bang, and have a general…
Femtosecond Structural Dynamics in VO2 during an Ultrafast Solid-Solid Phase Transition.
Femtosecond x-ray and visible pulses were used to probe structural and electronic dynamics during an optically driven, solid-solid phase transition in VO, suggesting that, in this regime, the structural transition may not be thermally initiated.
Possible light-induced superconductivity in K3C60 at high temperature
By exciting metallic K3C60 with mid-infrared optical pulses, a large increase in carrier mobility is induced, accompanied by the opening of a gap in the optical conductivity, which is observed at equilibrium when cooling metallic K 3C60 below Tc (20 kelvin).
Light-Induced Superconductivity in a Stripe-Ordered Cuprate
Mid-infrared femtosecond pulses are used to enable coherent transport between the copper oxide planes of a cuprate superconductor, and an upper limit for the time scale needed to form the superconducting phase is estimated to be 1 to 2 picoseconds, which places stringent new constraints on the understanding of stripe order and its relation to superconductivity.
Snapshots of non-equilibrium Dirac carrier distributions in graphene.
Time- and angle-resolved photoemission spectroscopy with femtosecond extreme-ultraviolet pulses are used to directly probe the non-equilibrium response of Dirac electrons near the K-point of the Brillouin zone, and no indication of carrier multiplication is found, questioning the applicability of graphene for light harvesting.
Transient States of Matter during Short Pulse Laser Ablation
Short pulse laser ablation of semiconductors and metals is studied by means of ultrafast timeresolved microscopy. The characteristic stages of the conversion of solid material into hot fluid matter…
Nonlinear phononics as an ultrafast route to lattice control
Light can interact with the electrons in a crystalline solid, which in turn generates lattice vibrations or phonons. A related phenomenon was proposed 40 years ago in which it is the ions in the…
Control of the electronic phase of a manganite by mode-selective vibrational excitation
This work reports the ultrafast switching of the electronic phase of a magnetoresistive manganite via direct excitation of a phonon mode at 71 meV (17 THz), and reports the vibrationally driven bandgap collapse observed here, which is uniquely attributed to a large-amplitude Mn–O distortion.
Nonlinear lattice dynamics as a basis for enhanced superconductivity in YBa2Cu3O6.5
The crystal structure of this exotic non-equilibrium state of YBa2Cu3O6+x is reported, determined by femtosecond X-ray diffraction and ab initio density functional theory calculations, and the enhancement in the character of the in-plane electronic structure is likely to favour superconductivity.