A5017753868- Molecular Junctions and Nanostructures
- Physics of Superconductivity and Magnetism
- Advanced Memory and Neural Computing
- Quantum and electron transport phenomena
- Surface and Thin Film Phenomena
- Electronic and Structural Properties of Oxides
- Neural dynamics and brain function
- Magnetic properties of thin films
- Neural Networks and Reservoir Computing
- Magnetic and transport properties of perovskites and related materials
- Magnetic confinement fusion research
- Electromagnetic Effects on Materials
- stochastic dynamics and bifurcation
- Fusion materials and technologies
- Topological Materials and Phenomena
- Spectroscopy and Quantum Chemical Studies
- Surface Chemistry and Catalysis
- Superconductivity in MgB2 and Alloys
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Condensed Matter Physics
- Ferroelectric and Negative Capacitance Devices
- Advanced Chemical Physics Studies
Freie Universität Berlin
2025
Radboud University Medical Center
2018-2024
Radboud Institute for Molecular Life Sciences
2018-2024
Radboud University Nijmegen
2018-2024
The pathway toward the tailored synthesis of materials starts with precise characterization conformational properties and dynamics individual molecules. Electron spin resonance (ESR)-based scanning tunneling microscopy can potentially address molecular structure unprecedented resolution. Here, we determine fine geometry an titanium-hydride molecule, utilizing a combination newly developed millikelvin ESR microscope in vector magnetic field ab initio approaches. We demonstrate strikingly...
BCS theory has been widely successful at describing elemental bulk superconductors. Yet, as the length scales of such superconductors approach atomic limit, dimensionality well environment superconductor can lead to drastically different and unpredictable superconducting behavior. Here, we report a threefold enhancement critical temperature gap size in ultrathin epitaxial Al films on Si(111), when approaching 2D based high-resolution scanning tunneling microscopy/spectroscopy (STM/STS)...
In the last decade, detecting spin dynamics at atomic scale has been enabled by combining techniques such as electron resonance (ESR) or pump–probe spectroscopy with scanning tunneling microscopy (STM). Here, we demonstrate an ultra-high vacuum STM operational milliKelvin (mK) temperatures and in a vector magnetic field capable of both ESR spectroscopy. By implementing GHz compatible cabling, achieve appreciable RF amplitudes junction while maintaining mK base temperature high energy...
Magnetic adatoms on superconductors induce Yu-Shiba-Rusinov (YSR) states, which are key to the design of low-dimensional correlated systems and topological superconductivity. Competing magnetic interactions superconducting pairing lead a rich phase diagram. Using scanning tunneling microscope (STM), we position Fe atoms <a:math...
Artificial electronic lattices, created atom by in a scanning tunneling microscope, have emerged as highly tunable platform to realize and characterize the lowest-energy bands of novel lattice geometries. Here, we show that artificial lattices can be tailored exhibit higher-energy bands. We study p-like four-fold three-fold rotationally symmetric lattices. In addition, how an anisotropic design used lift degeneracy between p_x- p_y-like The experimental measurements are corroborated...
Abstract A magnetic atom epitomizes the scaling limit for information storage. Individual atomic spins have recently exhibited remanence, a requirement memory. However, such memory has been only realized on thin insulating surfaces, removing potential tunability via electronic gating or exchange-driven coupling. Here, we show previously unobserved mechanism single-atom storage based bistability in orbital population, so-called valency, of an individual Co semiconducting black phosphorus...
Stochastically fluctuating multiwell systems are a promising route toward physical implementations of energy-based machine learning and neuromorphic hardware. One the challenges is finding tunable material platforms that exhibit such behavior understanding how complex dynamic input signals influence their stochastic response. platform recently discovered atomic Boltzmann machine, where each unit represented by binary orbital memory state an individual atom. Here, we investigate response...
Excitations of individual and coupled spins on superconductors provide a platform to study quantum spin impurity models as well pathway toward realizing topological computing. Here, we characterize, using ultralow temperature scanning tunneling microscopy/spectroscopy, the Yu-Shiba-Rusinov (YSR) states manganese phthalocyanine molecules with high an ultrathin lead film in variable transverse magnetic field. We observe two types YSR excitations, depending adsorption geometry. Using...
Excitations of individual and coupled spins on superconductors provide a platform to study quantum spin impurity models as well pathway toward realizing topological computing. Here, we characterize, using ultra-low temperature scanning tunneling microscopy/spectroscopy, the Yu-Shiba-Rusinov (YSR) states manganese phthalocyanine molecules with high character surface an ultra-thin lead film in variable transverse magnetic field. We observe two types YSR excitations, depending adsorption...
Orbital memory is defined by two stable valencies that can be electrically switched and read out. To explore the influence of an electric field on orbital memory, we studied distance-dependent atomic Cu donor state favorability individual Co atom black phosphorus. Using low temperature scanning tunneling microscopy spectroscopy, characterized electronic properties donors, corroborating this behavior with ab initio calculations based density functional theory. We charging energy stochastic...
BCS theory has been widely successful at describing elemental bulk superconductors. Yet, as the length scales of such superconductors approach atomic limit, dimensionality well environment superconductor can lead to drastically different and unpredictable superconducting behavior. Here, we report a threefold enhancement critical temperature gap size in ultrathin epitaxial Al films on Si(111), when approaching 2D based high-resolution scanning tunneling microscopy/spectroscopy (STM/STS)...
In the last decade, detecting spin dynamics at atomic scale has been enabled by combining techniques like electron resonance (ESR) or pump-probe spectroscopy with scanning tunneling microscopy (STM). Here, we demonstrate an ultra-high vacuum (UHV) STM operational milliKelvin (mK) and in a vector magnetic field capable of both ESR spectroscopy. By implementing GHz compatible cabling, achieve appreciable RF amplitudes junction while maintaining mK base temperature. We successful operation our...
Stochastically fluctuating multi-well systems as physical implementations of energy-based machine learning models promise a route towards neuromorphic hardware. Understanding the response to dynamic input signals is crucial in this regard. Here, we investigate stochastic binary orbital memory states derived from individual Fe and Co atoms on black phosphorus surface sinusoidal voltages. Using scanning tunneling microscopy, quantify state residence times for DC AC voltage drive with various...