Publications by Paul Beaud | EPFL Graph Search

A compact and cost-effective hard X-ray free-electron laser driven by a high-brightness and low-energy electron beam

Majed Chergui, Leonid Rivkin, Giulia Fulvia Mancini, Rasmus Ischebeck, Camila Bacellar Cases Da Silveira, Mike Seidel, Christoph Peter Hauri, Paul Beaud, Christopher Alexander Arrell, Eugenio Ferrari

We present the first lasing results of SwissFEL, a hard X-ray free-electron laser (FEL) that recently came into operation at the Paul Scherrer Institute in Switzerland. SwissFEL is a very stable, compact and cost-effective X-ray FEL facility driven by a lo ...

Nature Publishing Group2020

Experimental station Bernina at SwissFEL: condensed matter physics on femtosecond time scales investigated by X-ray diffraction and spectroscopic methods

Christopher Alexander Arrell, Christoph Peter Hauri, Paul Beaud, Giulia Fulvia Mancini, Jochen Rittmann

The Bernina instrument at the SwissFEL Aramis hard X-ray free-electron laser is designed for studying ultrafast phenomena in condensed matter and material science. Ultrashort pulses from an optical laser system covering a large wavelength range can be used ...

International Union of Crystallography (IUCr)2019

Towards X-ray transient grating spectroscopy

Majed Chergui, Paul Beaud, Giulia Fulvia Mancini, Erwan Fabrice Koch, Jérémy Raymond Jean Maurice Rouxel, Christian David

The extension of transient grating spectroscopy to the x-ray regime will create numerous opportunities, ranging from the study of thermal transport in the ballistic regime to charge, spin, and energy transfer processes with atomic spatial and femtosecond t ...

OPTICAL SOC AMER2019

Perspective: Opportunities for ultrafast science at SwissFEL

Majed Chergui, Paul Beaud

We present the main specifications of the newly constructed Swiss Free Electron Laser, SwissFEL, and explore its potential impact on ultrafast science. In light of recent achievements at current X-ray free electron lasers, we discuss the potential territor ...

2018

Watching ultrafast responses of structure and magnetism in condensed matter with momentum-resolved probes

Fabrizio Carbone, Paul Beaud

We present a non-comprehensive review of some representative experimental studies in crystalline condensed matter systems where the effects of intense ultrashort light pulses are probed using x-ray diffraction and photoelectron spectroscopy. On an ultrafas ...

2017

Ultrafast structural dynamics of the orthorhombic distortion in the Fe-pnictide parent compound BaFe2As2

Paul Beaud, Jochen Rittmann

Using femtosecond time-resolved hard x-ray diffraction, we investigate the structural dynamics of the orthorhombic distortion in the Fe-pnictide parent compound BaFe2As2. The orthorhombic distortion analyzed by the transient splitting of the (1 0 3) Bragg ...

Amer Inst Physics2016

Magnetic order dynamics in optically excited multiferroic TbMnO3

Christoph Peter Hauri, Paul Beaud

We performed ultrafast time-resolved near-infrared pump, resonant soft x-ray diffraction probe measurements to investigate the coupling between the photoexcited electronic system and the spin cycloid magnetic order in multiferroic TbMnO3 at low temperature ...

Amer Physical Soc2015

Ultrafast Structural Dynamics of the Fe-Pnictide Parent Compound BaFe2As2

Paul Beaud, Jochen Rittmann

Using femtosecond time-resolved x-ray diffraction we investigate the structural dynamics of the coherently excited A(1g) phonon mode in the Fe-pnictide parent compound BaFe2As2. The fluence dependent intensity oscillations of two specific Bragg reflections ...

American Physical Society2015

Femtosecond X-ray absorption study of electron localization in photoexcited anatase TiO2

Majed Chergui, Paul Beaud, Edoardo Baldini, Jochen Rittmann, Camelia Borca, Fabio Giacomo Santomauro, Mahsa Silatani, Patric Zimmermann

Transition metal oxides are among the most promising solar materials, whose properties rely on the generation, transport and trapping of charge carriers (electrons and holes). Identifying the latter's dynamics at room temperature requires tools that combin ...

Nature Publishing Group2015

Large-Amplitude Spin Dynamics Driven by a THz Pulse in Resonance with an Electromagnon

Christoph Peter Hauri, Paul Beaud

Multiferroics have attracted strong interest for potential applications where electric fields control magnetic order. The ultimate speed of control via magnetoelectric coupling, however, remains largely unexplored. Here, we report an experiment in which we ...

American Association for the Advancement of Science2014