Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy

Thermalization of quantum light induced by classical nonlinear wave dynamics

Thermalization of isolated quantum systems is an intriguing phenomenon at the forefront of contemporary physics. In this work, we demonstrate that nonlinear multimode optical platforms can be harnessed to induce effective quantum interactions between photons. Through numerical ex...

Photodoping-Driven Lattice Expansion Enables Polarization Enhancement in Sliding Ferroelectric MoS2

Abstract Light-matter interactions provide a powerful route to dynamically control ferroelectricity in low-dimensional materials, yet the microscopic mechanisms governing light-induced polarization remain elusive in sliding ferroelectrics. However, the influence of photodoped car...

Ultrafast Mimic of Spin Hall Effect in Altermagnets

Abstract The spin Hall effect, a key effect in creating spin currents and controlling magnetic order at the nanoscale, presupposes a population of mobile carriers in a conducting state, in which a driving charge current generates a perpendicular spin-current. Here we show an ultr...

All-Optical Ultrafast Pure Spin Current in the Altermagnet Cr2SO

Abstract All-optical generation of pure spin current─the flow of spin in the absence of a corresponding charge flow─relies on symmetry based compensation between the two spin channels. 2D d-wave altermagnets, which in many respects are ideal spintronic materials due to their very...

Phase control of interfering stimulated Raman pathways in the XUV regime

Abstract Coherent control uses interference between quantum pathways to enhance or suppress transitions to a target quantum state. In stimulated Raman excitation, such control can be achieved through interference between two indistinguishable pathways connecting the same initial...

Interfacial ferroelectricity at naturally-formed van der Waals interfaces

Sliding ferroelectrics emerge as compelling candidates for next-generation wafer-level non-volatile storage applications with low power consumption and high packing density. However, artificially stacked sliding ferroelectrics with homogeneous/heterogeneous interfaces rely on hig...

A thorium-229 optical nuclear clock with feedback loop

Abstract The laser-accessible nuclear transition in the thorium-229 isotope has been identified as a candidate for realizing an optical nuclear clock 1 that might outperform current optical clocks based on electron-shell transitions in atoms or ions 2 . It is expected to be more...

Time- and Frequency-Domain Study for Electron Beams Penetrating Dielectric Nanospheres: Fingerprints of Cherenkov and Transition Radiation

Abstract We present a theoretical study of Cherenkov and transition radiation for swift electron beams penetrating dielectric nanospheres using material models of different sophistication. Specifically, we perform a combined time-domain (numerically, via the discontinuous Galerki...

Continuous-wave laser absorption spectroscopy of the thorium-229 nucleus

Abstract The low-energy nuclear transition in thorium-229 (Th-229) has been excited in thorium-doped crystals with laser light 1–3 , opening the path towards a highly stable and robust solid-state optical nuclear clock 4 . The required laser radiation at 148-nm wavelength has so...

Structural dynamics during the three-ion Coulomb explosion of highly charged CS2 in intense soft x-ray pulses

Using intense femtosecond soft x-ray pulses above the sulfur 2p edge produced by the Free-electron LASer in Hamburg (FLASH), we investigate the multiple ionization and fragmentation dynamics of CS2. We focus on the three-ion fragmentation pathways of CS2 polycations with total ch...

Transient Laser‐Induced Periodic Surface Structures Revealed by Time‐Resolved EUV Diffuse Scattering

ABSTRACT The formation of permanent laser‐induced periodic surface structures (LIPSS) on solid surfaces under impulsive laser irradiation above the damage threshold has been the subject of extensive research. Here, we report the formation of transient quasi‐periodic surface modul...