Mastodawn

MPSD May 30, 2023

Now out in @Nature : #Terahertz light pulses stabilise #ferromagnetism in YTiO3 at three times its usual transition temperature!

https://www.nature.com/articles/s41586-023-05853-8#author-information

A brilliant collaboration by Ankit Disa and the MPSD's Cavalleri group with Jon Curtis and Prineha Naranag at the University of California - Los Angeles / @Harvard, the Leibniz Institute for Solid State and Materials Research and the Max Planck Institute for Solid State Research.

Photo-induced high-temperature ferromagnetism in YTiO3 - Nature

All-optical, mode-selective manipulation of the crystal lattice can be used to enhance and stabilize ferromagnetism in YTiO3 well above its equilibrium ordering temperature and for many nanoseconds, enabling dynamic engineering of practically useful non-equilibrium functionalities in fluctuating electronic systems.

Nature

MPSD Apr 13, 2023

idw_online Apr 13, 2023

Lightly dressed
A team of physicists watches electrons getting dressed with light...
https://idw-online.de/de/news812550

Lightly dressed

MPSD Apr 6, 2023

Fantastic news: Angel Rubio, MPSD director and head of our Theory Department, has been elected a member of Germany's National Academy of Sciences, the Leopoldina! Our warmest congratulations!

MPSD Apr 6, 2023

We've had a superb intern at the MPSD for the past five weeks. Yesterday was her final day. Good luck, Wiebke!

In den letzten fünf Wochen hatte wir eine tolle Praktikantin am Institut. Gestern war ihr letzter Tag. Alles Gute, Wiebke!
💐 🙏 🍀

#women #STEM #MINT #physics #research #internship #study #orientation

MPSD Mar 23, 2023

🧲 Now in npj Computational Materials: 'Attosecond magnetization dynamics in non-magnetic materials driven by intense femtosecond lasers' - a study by Ofer Neufeld and members of our Theory Department. They show that fast electron dynamics in bismuthumane (BiH) can be converted to #attosecond magnetism and predict a magnetic response at record speed. Such processes could be important for future memory storage devices.

#laser #lightsources #magnetization

Paper: https://www.nature.com/articles/s41524-023-00997-7

Attosecond magnetization dynamics in non-magnetic materials driven by intense femtosecond lasers - npj Computational Materials

Irradiating solids with ultrashort laser pulses is known to initiate femtosecond timescale magnetization dynamics. However, sub-femtosecond spin dynamics have not yet been observed or predicted. Here, we explore ultrafast light-driven spin dynamics in a highly nonresonant strong-field regime. Through state-of-the-art ab initio calculations, we predict that a nonmagnetic material can transiently transform into a magnetic one via dynamical extremely nonlinear spin-flipping processes, which occur on attosecond timescales and are mediated by cascaded multi-photon and spin–orbit interactions. These are nonperturbative nonresonant analogs to the inverse Faraday effect, allowing the magnetization to evolve in very high harmonics of the laser frequency (e.g. here up to the 42nd, oscillating at ~100 attoseconds), and providing control over the speed of magnetization by tuning the laser power and wavelength. Remarkably, we show that even for linearly polarized driving, where one does not intuitively expect the onset of an induced magnetization, the magnetization transiently oscillates as the system interacts with light. This response is enabled by transverse light-driven currents in the solid, and typically occurs on timescales of ~500 attoseconds (with the slower femtosecond response suppressed). An experimental setup capable of measuring these dynamics through pump–probe transient absorption spectroscopy is simulated. Our results pave the way for attosecond regimes of manipulation of magnetism.

Nature

MPSD Mar 7, 2023

Out now in Physical Review Letters: A new collaborative paper on #entanglement dynamics in a strongly correlated fermionic chain.

Michael Sentef, Mona Kalthoff, Damian Hofmann und Dante Kennes from the MPSD joined forces with Denitsa R. Baykusheva and Matteo Mitrano at Harvard University as well as Martin Claassen from the University of Pennsylvania. 😃 Congratulations on the publication!

#fermions @quantum #dynamics #nonequilibrium

https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.130.106902

Witnessing Nonequilibrium Entanglement Dynamics in a Strongly Correlated Fermionic Chain

Many-body entanglement in condensed matter systems can be diagnosed from equilibrium response functions through the use of entanglement witnesses and operator-specific quantum bounds. Here, we investigate the applicability of this approach for detecting entangled states in quantum systems driven out of equilibrium. We use a multipartite entanglement witness, the quantum Fisher information, to study the dynamics of a paradigmatic fermion chain undergoing a time-dependent change of the Coulomb interaction. Our results show that the quantum Fisher information is able to witness distinct signatures of multipartite entanglement both near and far from equilibrium that are robust against decoherence. We discuss implications of these findings for probing entanglement in light-driven quantum materials with time-resolved optical and x-ray scattering methods.

Physical Review Letters

MPSD Mar 2, 2023

Former MPSD postdoc Eike C. Schulz receives an @ERC_Research Synergy Grant to investigate the binding process between proteins. Time-resolved serial #crystallography, developed at the MPSD, will be one of the key methods to observe protein activity. Congratulations, Eike! 💐 👏

With @LindorffLarsen from the University of Copenhagen, Mikael Akke at Lund University and University Medical Centre Hamburg.

#nmr #md #simulations #spectroscopy #ligands #proteins

MPSD Feb 27, 2023

Max-Planck-Gesellschaft Feb 26, 2023

Happy birthday…to us! 😉😃 🎂🥳 We're celebrating a milestone anniversary today: 75 years ago, on February 26, 1948, the Max Planck Society was formally founded in Göttingen as the successor organization to the Kaiser Wilhelm Society. #maxplanck75 #maxplanckhistory

MPSD Feb 21, 2023

New paper outlines Xray measurement technique and analysis procedure to make the best use of collected photons @EuropeanXFEL. The resulting data is close to the photon shot-noise limit. Review of set-up by Le Guyader et al, with @ProfCompMod, now in the Journal of Synchrotron Radiation: https://bit.ly/3IHiHFq

#xfel #xray #free #electron #laser #spectroscopy

Photon-shot-noise-limited transient absorption soft X-ray spectroscopy at the European XFEL

A beam-splitting off-axis zone plate setup to measure transient X-ray absorption spectroscopy is presented, as implemented at the Spectroscopy and Coherent Scattering instrument at the European X-ray Free-Electron Laser.

Journal of Synchrotron Radiation

MPSD Feb 7, 2023

Gratulation, Matthew Day, zum Humboldt-Forschungstipendium! Matthew arbeitet in der Forschungsgruppe 'Ultrafast Transport in #Quantum Materials' und spezialisiert sich auf die nicht-lineare, multidimensionale #Spektroskopie.

@maxplanckpress @HumboldtStiftung #forschung #stipendium #postdoc