Description
The Poster Session is held on Tue and Wed. All posters are to be presented on both days. However, due to technical reasons, the contributions are only listed in the timetable of Tue.
We simulate and visualize the three-dimensional domain structure of multiferroic hexagonal manganites using phase-field simulations. Due to the improper nature of their ferroelectric order, hexagonal manganites exhibit unconventional six-fold vortices in their ferroelectric domain patterns. In 3D, these domain patterns are characterized by vortex lines, which are 1D topological defects that...
Graphene nanoribbons (GNRs) are narrow strips of graphene with width-dependent electronic bandgaps, making them promising building blocks for nanoelectronic devices. However, structural defects can alter their electronic and optical properties, making defect characterization in GNRs a crucial step towards their further development. We use angle-resolved polarized Raman spectroscopy and density...
Using Hartree-Fock calculations we explored the possibility of spin,valley and translational symmetry breaking in Bernal bilayer graphene. Our aim is to explain the phases present near the van Hove singularity that arises in the band structure when an out-of-plane electric field is applied. A displacement field versus carrier density phase diagram was obtained in good agreement ...
Mueller Polarimetry is a technique that can differentiate areas with distinct optical structures, such as tumorous and healthy tissue, or identify complex optical structures like fiber orientation in the brain. The well-established calibration methods of Mueller Polarimetric setups in transmission cannot be straightforwardly applied to reflection or back-scattering configurations. In our...
To improve existing theoretical models and obtain accurate values for fundamental constants, precise measurements of absolute nuclear charge radii are necessary. These can help in improving our knowledge of bound-state QED and aid in exploring new physics beyond the Standard Model.
While muonic atom spectroscopy is known for its precision, measuring 2p–1s transition energies for low-Z nuclei...
At the Paul Scherrer Institute we are developing a high precision instrument to measure the electric dipole moment (EDM) of the muon by trapping particles in a compact storage ring. A muon EDM is a background free sign of new physics and would lead to a time-dependent directional asymmetry of decay positrons, measured by detectors close to the storage ring. The strong magnetic pulse used to...
Dual-phase xenon Time Projection Chambers (TPCs) have been the leading technology in dark matter direct detection for the last several decades. Many questions remain regarding the responses from interactions within the liquid xenon (LXe). The Michigan Xenon experiment (MiX) is a 10 kg LXe TPC designed to study the microphysics of LXe, including measuring the W-value, or the mean energy...
A precise configuration of electric and magnetic fields will be essential to realise the yet-undemonstrated frozen-spin technique [Farley et al. (2004), PRL:93:052001]. The apparatus under development at PSI relies on storing muons within a 3T solenoid. The trapping scheme involves a pulsed magnetic field to kick their longitudinal momentum upon entry into a weakly-focusing magnetic...
A new SciFi tracker was added to the LHC during the second Long Shutdown (2019-2022). It consists of three stations, each with four detection layers of around 6mx5m. Real-time 3D alignment monitoring is provided by opto-electronic BCAM sensors, which detect movements caused by magnet cycles, SciFi detector powering, or environmental changes. Triangulation provides positions for 14 points on...
In the poster I will discuss the LEMING experiment and recent efforts in finding low-threshold (~keV) electron detectors using bright perovskite nanocrystals at cryogenic temperatures.
The n2EDM experiment aims to improve the most accurate measurement of the neutron electric dipole moment (nEDM), which requires a stable and uniform magnetic field.
Our Remote Magnetometer System (RMS) uses 14 Raspberry Pis to continuously measure the magnetic field around the n2EDM experiment. The acquired data can provide real-time information for other subsystems of the experiment....
In High-Energy Physics, generating meaningful parton configurations from a collision reconstructed within a detector is a critical step for many complex tasks like the Matrix Element Method computation and Bayesian inference on parameters of interest.
We propose to tackle this problem from a new perspective by using a Transformer network to analyze the full event at the reconstruction...
The n2EDM experiment, currently under commission at the Paul Scherrer Institute, aims to improve the sensitivity of the neutron electric dipole moment measurement by an order of magnitude. Achieving this sensitivity requires precise magnetic field measurements to control adverse systematic effects resulting from magnetic field inhomogeneities. An array of 112 optically-pumped cesium...
The AEgIS experiment aims at measuring the gravitational acceleration of antihydrogen ($\bar{\hbox{H}}$). A key limitation is the $\bar{\hbox{H}}$ temperature because the thermal motion blurs the $\bar{\hbox{H}}$ free-fall trajectories. Sympathetic cooling of antiprotons by co-trapped laser-cooled negative ions would enable synthesis of $\bar{\hbox{H}}$ at mK temperatures -- three to four...
Lithium niobate on insulator is a promising platform for integrated quantum photonics. Its strong nonlinear coefficient and electro-optic effect allow the integration of photon pair sources and fast reconfigurable interferometers for boson sampling. The photons are generated via spontaneous parametric down-conversion (SPDC). Two key aspects of the photon pairs are their bandwidth and the...
Globular clusters, as observed, host various stellar populations with distinct abundance patterns of light elements but the underlying mechanisms remain elusive. The existing literature explores the formation of these populations and their abundances, with one of the proposed scenarios being the creation of supermassive stellar objects via protostar collisions during cluster formation....
The Laser Interferometer Space Antenna (LISA) is an upcoming space-based observatory designed to detect gravitational waves (GWs) in the millihertz frequency range, expecting to observe 1-20 massive black hole binaries (MBHBs) annually. Precise estimation of both the merger time and sky location of MBHBs is critical for capturing the electromagnetic signals enabling multi-messenger astronomy....
This poster showcases development of an experimental setup for time-resolved THz time-domain spectroscopy with tunable temperature and pressure capabilities, down to 10K and up to 10GPa. Ultrafast dynamics experiments typically excite materials from their equilibrium ground state to investigate various properties. Pressure control enables direct manipulation of this state. Combining tunable...
Physical properties can change significantly when bulk materials are thinned down to a few atomic layers. Here, we study the intriguing example of the metallic charge density wave system 1T-$TaSe_2$. Previous transport experiments on 1T-$TaSe_2$ found a metal to insulator transition at a thickness of 5 layers. Monolayer 1T-$TaSe_2$ was proposed to be a Mott insulator and is a candidate quantum...
Bulk T$_d$-MoTe$_2$ is a type-II Weyl semimetal and becomes superconducting at a critical temperature of $T_c = 0.1,\text{K}$. Remarkably, superconductivity becomes far more robust in the 2D-limit, contrary to the trend in ultrathin metal-films. Recent transport measurements reported an increase in $T_c$ for decreasing thickness, with $T_c = 7.6,\text{K}$ in the monolayer. The reasons for the...
The primary objective of this study is to propose a methodology for determining the fill factor and thickness of III-V semiconductor nanowire layer grown on a substrate. To achieve this goal, we utilized the surface phonon-peak positions in the Raman spectra, which correspond to the perturbation of the GaN nanowire (NW) surface, to model the dielectric environment near the surface and thus...
Ferrimagnetic materials have emerged as promising candidates for spintronic applications due to the ultrafast domain wall motion observed at the magnetization compensation point. Although there is an intrinsic explanation of this, the changes in the characteristics of the domain wall over this transition have not been observed. To probe these changes over the compensation point we measure...
Artificial spin ices are lithographically defined arrangements of dipolar-coupled nanomagnets, which are engineered to mimic various phenomena occurring in complex materials or theoretical models. An open challenge is the direct imaging of the low temperature phases in artificial kagome spin ice. Due to the high frustration associated with the kagome lattice, the moments freeze before the low...
In this experiment, we study Er, Dy, Gd and Ho deposited on NaCl thin films grown on Ag(100) using STM, IETS and DFT simulations.
The studied lanthanide atoms adsorbed as both adatoms and substitutional atoms. These two species present different adsorption sites, apparent height, and stability. These results agree with the performed DFT simulations.
The dI/dV spectra for Er, Dy and Ho...
Our recent developments in magnetically controlled micromachines enable precise angular motion control and device reconfigurability. Pairing this capability with metasurfaces exhibiting angular-dependent optical responses generates devices with a magnetically controlled coloration, opening avenues for advancements in angular-dependent optical properties. We will present our approach that...
Artificial spin ices are nanomagnet arrays whose coupled behaviour can be tailored by modifying the nanomagnet arrangement. Recently the Einstein “hat” tiling has been discovered, which includes the first non-trivial aperiodic monotile and can be obtained by deleting certain links in the deltoidal trihexagonal tiling. We have fabricated such artificial spin ices, which span the continuum...
At the BOA beamline at SINQ, neutron imaging and scattering experiments are conducted using cold polarised neutrons, which are obtained via moderation of spallation neutrons in a cold D2 moderator. Nevertheless, fast scattered neutrons can penetrate the beamline shielding, resulting in undesired noise for experiments.
The presence of fast neutrons in the BOA cave is demonstrated using an...
This work presents a single-shot THz detection technique utilizing optically chirped probe pulses combined with a small bias detection scheme to enhance the detected THz signals. By measuring the THz signals at opposite optical biases ±θ, where θ is a small angle of the quarter waveplate (QWP) near zero, an 18-fold enhancement factor is achieved compared to the standard electro-optic sampling...
Optical parametric oscillators (OPOs) are key components for applications like squeezing and random number generation. Their dense integration on-chip would allow the realization of computational networks such as Ising machines. However, integrated OPOs to date feature millimeters long quasi-phase matching regions that are located inside racetrack resonators, resulting in large footprint...
Integrated quantum photonics poses some essential requirements a material needs to fulfil to be able to provide a fully integrated platform, among those is the ability of creating and interfering single photons.
Given its second order non-linearity lithium niobate on insulator (LNOI) stands out among the contenders in integrated quantum photonics since it enables spontaneous parametric...
Cyanobacteria play a vital role in carbon and nitrogen cycles via photosynthesis, making them significant subjects for investigating factors affecting light utilization efficiency. Photosynthetic microorganisms hold promise for sustainable energy conversion in photovoltaics. Previous studies have shown that applying an external electric field to microbial biofilms or cells enhances electron...
Focal Molography is a new label-free method for real-time molecular interaction analysis in buffers, as well as in complex media, such as cell lysate. Here, we show an applied project from drug discovery research of an interaction between a protein and a peptide. The kinetic rate constant (KD) of the interaction was determined in buffer and in cell lysate (1 Mio cells / mL). We have shown that...
Natural chiral structures, such as those found in scarab beetle, characterized by objects that cannot be superimposed onto their mirror images, is a fundamental yet mysterious property observed from the molecular to the cosmic scale. Natural chiral structures, is significant progress in chiral photonics and the creation of synthetic photonic systems. The cuticle of jewel scarabs features...
SST-1M is a single-mirror small size Cherenkov telescope prototype developed by a consortium among institutes in Switzerland, Poland, and the Czech Republic. Currently undergoing commissioning at the Ondřejov Observatory in the Czech Republic, two SST-1M telescopes are actively collecting data of astrophysical gamma-ray sources. This poster provides an overview of the telescope and camera...
