BEGIN:VCALENDAR VERSION:2.0 PRODID:icalendar-ruby CALSCALE:GREGORIAN METHOD:PUBLISH BEGIN:VEVENT DTSTAMP:20260415T032253Z UID:https://www.mpsd.mpg.de/events/45334/1086032 DTSTART:20260414T081500Z DTEND:20260414T100000Z CLASS:PUBLIC CREATED:20260408T133421Z DESCRIPTION:Interfaces between different material phases or materials of di fferent chemical composition often define or allow tuning the properties o f a system of interest. An atomistic level of understanding such interface s provides an invaluable insight into the electronic properties and micros copic mechanisms that lead to interfacial reactions\, atomic restructuring \, and emergent electronic properties. In the first part of this seminar\, I will introduce several fundamental concepts of the methodology our grou p uses in its research\, such as the Born—Oppenheimer approximation for the dynamics of nuclei and the notion of the first-principles potential en ergy surface\, the efficient and rigorous treatment of nuclear quantum eff ects via the imaginary-time path-integral formulation\, and the representa tion of first-principles electronic structure by machine learning models. I will then discuss in more detail how one can connect to experiments by u sing such simulations\, in particular regarding the simulation of Raman sc attering signals. I will discuss our developments of first-principles simu lations of tip-enhanced Raman spectroscopy (TERS) images of molecular adso rbates on metal substrates. The results demonstrate that accurate simulati ons are capable of reproducing experimental measurements and serve as a po werful interpretative tool that allows us to shed light on the role of the metal substrate in shaping TERS images and discuss the underlying physics . To reach beyond the harmonic approximation\, we demonstrate that the met hods of molecular dynamics and machine learning can be seamlessly integrat ed into the TERS simulations and enable efficient\, large-scale\, quantita tive predictions of nuclear quantum and finite-temperature effects on such spectra.\nSpeaker: Krystof Brezina LAST-MODIFIED:20260410T062128Z LOCATION:MPSD Bldg. 900\, Room: Seminar Room 136 SUMMARY:MPSD Exchange: First-principles simulations of interfacial processe s URL;VALUE=URI:https://www.mpsd.mpg.de/events/45334/1086032 END:VEVENT BEGIN:VEVENT DTSTAMP:20260415T032253Z UID:https://www.mpsd.mpg.de/events/44701/1086032 DTSTART:20260210T091500Z DTEND:20260210T110000Z CLASS:PUBLIC CREATED:20260204T151322Z DESCRIPTION:Surface Acoustic Waves (SAWs) are directed phonon modes whose a mplitude\, wavelength\, andfrequency can be precisely controlled via nanof abrication techniques. From transportmeasurements in 2D quantum materials to optical spectroscopy\, SAWs represent a tool forexploring and manipulat ing light-matter-phonon coupling in low-dimensional condensed mattersystem s.This talk will introduce the fundamental concept of SAW generation and p ropagation\,highlighting how piezoelectric transduction enables coherent p honon control. We will showcaseopportunities for interdisciplinary collabo ration across the Max Planck Institute for the Structureand Dynamics of Ma tter\, where SAW technology bridges multiple experimental domains:modeling phonon-driven dynamics and strain-engineered band structures\, optical sp ectroscopyof SAW-induced modulation in 2D materials\, and tailored microfa brication for ultra-shortwavelength devices.\nSpeaker: Lars Tiemann LAST-MODIFIED:20260204T151553Z LOCATION:MPSD Bldg. 900\, Room: Seminar Room 136 SUMMARY:MPSD Exchange: Good Vibrations: Probing &\; Controlling Matter via Surface Acoustic Waves URL;VALUE=URI:https://www.mpsd.mpg.de/events/44701/1086032 END:VEVENT BEGIN:VEVENT DTSTAMP:20260415T032253Z UID:https://www.mpsd.mpg.de/events/44330/1086032 DTSTART:20260113T093000Z DTEND:20260113T103000Z CLASS:PUBLIC CREATED:20260109T150228Z DESCRIPTION:When an intense laser is emitted on a solid\, the material can emit light at many multiples of the laser’s color\, so‑called high har monics. These harmonics act like fingerprints of how electrons move and in teract on an extremely short timescale. We review recent theoretical advan ces for describing the all-optical spectroscopic technique of high-order h armonic spectroscopy in condensed matter systems. Theoretical methods for characterizing the underlying ultrafast electron processes\, their interac tions beyond the electric dipole\, and the presence of excitons will be di scussed. With it\, predictions are made concerning the spectroscopic signa tures of beyond-electric-dipole interactions\, exciton processes\, phase t ransitions\, or other aspects of the ultrafast generation process.\nSpeake r: Simon Jensen LAST-MODIFIED:20260109T150857Z LOCATION:MPSD Bldg. 900\, Room: Seminar Room 136 SUMMARY:MPSD Exchange: How intense light drives electrons: Strong-field lig ht-matter interactions in materials URL;VALUE=URI:https://www.mpsd.mpg.de/events/44330/1086032 END:VEVENT BEGIN:VEVENT DTSTAMP:20260415T032253Z UID:https://www.mpsd.mpg.de/events/44000/1086032 DTSTART:20251209T091500Z DTEND:20251209T103000Z CLASS:PUBLIC CREATED:20251201T131738Z DESCRIPTION:UTe2 displays a tantalizing phase diagram under high magnetic f ields\, featuring multipleunconventional superconducting and magnetic phas es with distinct order parameters. In thisMPSD exchange seminar\, I will p resent our recent experimental results on probing nonlinearelectronic tran sport in these non-trivial states.First\, I will discuss the field-reinfor ced superconducting state and its strongly anisotropic vortexresponse with respect to both current and magnetic-field orientation. These results rev eal anunexpected quasi-2D superconducting state in a non-layered material. Next\, I will provideevidence for a first-order transition modulated by h igh current densities in the high-field region\,emphasizing its direct con nection to a hidden order within the field-polarized phase.\nSpeaker: Ling Zhang LAST-MODIFIED:20251201T132305Z LOCATION:MPSD Bldg. 900\, Room: Seminar Room 136 SUMMARY:MPSD Exchange: Nonlinear electric transport in high-field supercond uctor UTe2 URL;VALUE=URI:https://www.mpsd.mpg.de/events/44000/1086032 END:VEVENT BEGIN:VEVENT DTSTAMP:20260415T032253Z UID:https://www.mpsd.mpg.de/events/43311/1086032 DTSTART:20251111T093000Z DTEND:20251111T103000Z CLASS:PUBLIC CREATED:20251006T135817Z DESCRIPTION:Chirality is a fundamental symmetry property of materials. Beyo nd the conventional classification of crystal systems as chiral or achiral \, there exists a distinct subclass of achiral systems known as antiferroc hiral. In this kick-off seminar of the MPSD internal seminar series\, I wi ll discuss the novel properties of such systems\, including linear and non linear responses\, as well as quasiparticle excitations.The concept of hig her-order chirality will be introduced as a unified framework to describe these systems. Building on this perspective\, new opportunities for chiral ity engineering will be highlighted\, focusing on two recent experimental demonstrations from the Cavalleri department: light control of chirality a nd strain control of chirality.\nSpeaker: Paul Zheng LAST-MODIFIED:20251103T083734Z LOCATION:MPSD Bldg. 900\, Room: Seminar Room 136 SUMMARY:MPSD Exchange: Higher-order chiral systems: a new landscape for chi rality engineering URL;VALUE=URI:https://www.mpsd.mpg.de/events/43311/1086032 END:VEVENT END:VCALENDAR