Weak measurements [1], introduced more than 30 years ago, underwent a metamorphosis from a theoretical curiosity to a powerful resource for exploring foundations of quantum mechanics, as well as a practical laboratory tool. However, unlike in the original textbook experiment, where an experiment with massive particles is proposed, experimental applications are realized applying photonic...
Standard diffraction experiments are routinely used to investigate the (PERIODIC) structure of materials. However, they only yield information on the amplitudes while the phase information is lost ('phase problem' of diffraction).
In this talk we will experimentally demonstrate by the example of a simple one-dimensional holographic grating how the entire information - amplitude and phase - of...
The search for a neutron electric dipole moment (EDM) is of significant interest in understanding the observed baryon asymmetry in the universe. Historically, two methods have been employed to measure an EDM, storage of ultracold neutrons (UCN) and cold neutron beams, with the latter being abandoned in the 1980s due to a limiting relativistic systematic effect. The BeamEDM...
Recent detector developments lead to enhancement of spatial resolution capabilities of neutron imaging to single digit micrometer level. At PSI, a device that enabled imaging with better than 5 micrometers spatial resolution was developed in the framework of a Neutron Microscope project and is now available to a broad neutron imaging user community at various beamlines. The progress achieved...
Neutron beams enable a large variety of studies in fundamental physics research. In particular, neutron beta decay allows for a detailed study of the weak interaction within the standard model of particle physics and possible extensions beyond it. Among other observables, a number of correlation coefficients may be determined, providing a complementary way to high-energy accelerator...
Neutron grating interferometry (nGI) is an established neutron imaging method that has found successful application in a wide range of scientific fields such as soft matter, magnetism and superconductors.
Here we present the latest developments that enable to achieve directional sensitivity of the scattering signal and retrieve quantitative information about the phase shift induced by the...
Angle-resolved photoemission spectroscopy (ARPES), and its extension in the time-resolved regime (TR-ARPES), has revealed to be a powerful technique to study of unconventional superconductivity. In this contribution I will present our TR-ARPES measurements on the cuprate Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$. By employing a pulse of duration comparable to the timescales of the superconducting...
Revealing the dynamics of collective excitations (e.g. excitons, phonons, plasmons, magnons…) in quantum materials is a central topic in condensed matter physics, as collectivity lies at the origin of several cooperative phenomena that lead to profound transformations, instabilities and phase transitions. Here, we will explore the dynamics of such collective excitations from the perspective of...
Furka, the end-station for condensed matter and quantum materials at Athos beamline, will be dedicated to time resolved Resonant Inelastic and Elastic X-ray Scattering (tr-RIXS and tr- REXS) and time-resolved soft X-ray diffraction (tr-SXRD) studies. The intriguing properties of correlated materials originate from the strong coupling between charge, orbital, spin, and lattice degrees of...
Magnonics, the study and development of devices utilising collective spin excitations, is a rapidly growing field, covering both fundamental topics (antiferromagnetism, quasiparticle condensates) and technological applications (MRAM, spintronics). Yttrium iron garnet (YIG) is a ferrimagnetic insulator with the lowest known magnon damping factor of any material. This low damping leads to a...
Ultrafast electron microscopy provides the possibility to conduct time-resolved experiment in three independent dimensions: real space, reciprocal space and energy domain. Being promising for condensed matter and material research it also serves as a platform for electron-light interaction. There are two mechanisms which facilitate the strong interaction regime: interaction with near-fields...
