J
J. Schlappa
Researcher at Paul Scherrer Institute
Publications - 42
Citations - 1074
J. Schlappa is an academic researcher from Paul Scherrer Institute. The author has contributed to research in topics: Scattering & Resonant inelastic X-ray scattering. The author has an hindex of 16, co-authored 30 publications receiving 887 citations. Previous affiliations of J. Schlappa include Helmholtz-Zentrum Berlin & European XFEL.
Papers
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Journal ArticleDOI
Spin-orbital separation in the quasi-one-dimensional Mott insulator Sr2CuO3.
J. Schlappa,J. Schlappa,Krzysztof Wohlfeld,K.J. Zhou,K.J. Zhou,Martin Mourigal,Maurits W. Haverkort,Vladimir N. Strocov,Liviu Hozoi,Claude Monney,Satoshi Nishimoto,Surjeet Singh,Surjeet Singh,A. Revcolevschi,Jean-Sébastien Caux,L. Patthey,Henrik M. Rønnow,J.E. van den Brink,T. Schmitt +18 more
TL;DR: The separation of the orbital degree of freedom (orbiton) is observed using resonant inelastic X-ray scattering on the one-dimensional Mott insulator Sr2CuO3 to resolve an orbiton separating itself from spinons and propagating through the lattice as a distinct quasi-particle with a substantial dispersion in energy over momentum.
Journal ArticleDOI
Unveiling the complex electronic structure of amorphous metal oxides
Cecilia Århammar,Annette Pietzsch,Nicolas Bock,Erik Holmstroem,C. Moyses Araujo,Johan Gråsjö,Shuxi Zhao,Sara Green,Travis Peery,Franz Hennies,Shahrad Amerioun,Alexander Foehlisch,J. Schlappa,Thorsten Schmitt,Vladimir N. Strocov,Gunnar A. Niklasson,Duane C. Wallace,Jan-Erik Rubensson,Börje Johansson,Rajeev Ahuja +19 more
TL;DR: In this paper, the authors presented X-ray synchrotron measurements, with an energy resolution which is about 5-10 times higher than is attainable with standard spectrometers, of amorphous alumina.
Journal ArticleDOI
Collective Magnetic Excitations in the Spin Ladder Sr14Cu24O41 Measured Using High-Resolution Resonant Inelastic X-Ray Scattering
J. Schlappa,Thorsten Schmitt,Francois Vernay,Vladimir N. Strocov,V. Ilakovac,V. Ilakovac,B. Thielemann,Henrik M. Rønnow,S. Vanishri,A. Piazzalunga,Xiaoqun Wang,Lucio Braicovich,Giacomo Claudio Ghiringhelli,C. Marin,Joël Mesot,Joël Mesot,Bernard Delley,Luc Patthey +17 more
TL;DR: In this paper, the authors investigated magnetic excitations in the spinladder compound Sr14Cu24O41 using high-resolution Cu L-3 edge resonant inelastic x-ray scattering (RIXS), and demonstrated that RIXS couples to two-triplon collective excitations.
Journal ArticleDOI
Observation of fluctuation-mediated picosecond nucleation of a topological phase
Felix Büttner,Bastian Pfau,Marie Böttcher,Michael Schneider,G. Mercurio,Christian M. Günther,Piet Hessing,Christopher Klose,Angela Wittmann,Kathinka Gerlinger,Lisa-Marie Kern,Christian Strüber,Clemens von Korff Schmising,Josefin Fuchs,Dieter Engel,Alexandra Churikova,Siying Huang,Daniel Suzuki,Ivan Lemesh,Mantao Huang,Lucas Caretta,David Weder,John H. Gaida,Marcel Möller,Tyler R. Harvey,Sergey Zayko,Kai Bagschik,Robert Carley,Laurent Mercadier,J. Schlappa,Alexander Yaroslavtsev,Loïc Le Guyarder,Natalia Gerasimova,A. Scherz,Carsten Deiter,Rafael Gort,David Hickin,Jun Zhu,Monica Turcato,David Lomidze,F. Erdinger,Andrea Castoldi,Andrea Castoldi,S. Maffessanti,M. Porro,Andrey Samartsev,Jairo Sinova,Claus Ropers,J.H. Mentink,Bertrand Dupé,Bertrand Dupé,Geoffrey S. D. Beach,Stefan Eisebitt +52 more
TL;DR: Atomistic simulations indicate that the fluctuation state largely reduces the topological energy barrier and thereby enables the observed rapid and homogeneous nucleation of the skyrmion phase, and suggest a path towards ultrafast topological switching in a wide variety of materials through intermediate fluctuating states.
Journal ArticleDOI
Spatial quantum beats in vibrational resonant inelastic soft x-ray scattering at dissociating states in oxygen
Annette Pietzsch,Yu-Ping Sun,Franz Hennies,Zilvinas Rinkevicius,Hans O. Karlsson,Thorsten Schmitt,Vladimir N. Strocov,Joakim Andersson,Brian Kennedy,J. Schlappa,Alexander Föhlisch,Alexander Föhlisch,Jan-Erik Rubensson,Faris Gel'mukhanov +13 more
TL;DR: Resonant inelastic soft x-ray scattering (RIXS) spectra excited at the 1σ(g) → 3σ(u) resonance in gas-phase O2 show excitations due to the nuclear degrees of freedom with up to 35 well-resolved discrete vibronic states and a continuumDue to the kinetic energy distribution of the separated atoms.