Andreas Eich

Andreas Eich
Radboud University | RU · Academic Cooperation

Dr. rer. nat.

About

26
Publications
7,998
Reads
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831
Citations
Additional affiliations
August 2022 - present
LiangDao
Position
  • Teamlead Academic Cooperation
Description
  • It's all about LiDAR and AI-based perception technology.
June 2009 - January 2014
Hamburg University
Position
  • PhD Student

Publications

Publications (26)
Article
3D point cloud semantic segmentation plays an essential role in fine-grained scene understanding from photogrammetry to autonomous driving. Although recent efforts have been made to push the 3D semantic segmentation forward, many solutions cannot generalize well to new data with different sensor configurations. For example, when transferring the se...
Article
Full-text available
There is immense interest in how the local environment influences the electronic structure of materials at the single-layer limit. We characterize moiré induced spatial variations in the electronic structure of in situ grown monolayer V2S3 on Au(111) by means of low-temperature scanning tunneling microscopy and spectroscopy. We observe a long-range...
Preprint
Full-text available
There is immense interest in how the local environment influences the electronic structure of materials at the single layer limit. We characterize moir\'e induced spatial variations in the electronic structure of in-situ grown monolayer V$_{2}$S$_{3}$ on Au(111) by means of low temperature scanning tunneling microscopy and spectroscopy. We observe...
Article
A structurally ordered spin glass Spin glasses that form in disordered materials such as magnetic alloys have locally varying magnetic patterns, and their spin relaxation occurs over time scales spanning many orders of magnitude. Kamber et al. used spin-polarized scanning tunneling microscopy to image the magnetism on the (0001) surface of thick, s...
Preprint
Full-text available
Spin glasses are a fascinating but highly complex magnetic state of matter, traditionally investigated in materials with a random distribution of exchange interactions. Intricately linked to spin frustration and disorder, spin glasses exhibit no long-range order and exude aging phenomena, distinguishing them from quantum spin liquids. Here we repor...
Article
Full-text available
Charge transfers resulting from weak bondings between two-dimensional materials and the supporting substrates are often tacitly associated with their work function differences. In this context, two-dimensional materials could be normally doped at relatively low levels. Here, we demonstrate how even weak hybridization with substrates can lead to an...
Preprint
Full-text available
We demonstrate how hybridization between a two-dimensional material and its substrate can lead to an apparent heavy doping, using the example of monolayer TaS$_2$ grown on Au(111). Combining $\textit{ab-initio}$ calculations, scanning tunneling spectroscopy experiments and a generic model, we show that strong changes in Fermi areas can arise with m...
Article
Full-text available
We describe the design and performance of a scanning tunneling microscope (STM) which operates at a base temperature of 30 mK in a vector magnetic field. The cryogenics is based on an ultra-high vacuum (UHV) top-loading wet dilution refrigerator that contains a vector magnet allowing for fields up to 9 T perpendicular and 4 T parallel to the sample...
Preprint
We describe the design and performance of a scanning tunneling microscope (STM) which operates at a base temperature of 30 mK in a vector magnetic field. The cryogenics is based on an ultra-high vacuum (UHV) top-loading wet dilution refrigerator that contains a vector magnet allowing for fields up to 9 T perpendicular and 4 T parallel to the sample...
Article
Single-layer TaS$_2$ is epitaxially grown on Au(111) substrates. The resulting two-dimensional crystals adopt the 1H polymorph. The electronic structure is determined by angle-resolved photoemission spectroscopy and found to be in excellent agreement with density functional theory calculations. The single layer TaS$_2$ is found to be strongly n-dop...
Preprint
Single-layer TaS$_2$ is epitaxially grown on Au(111) substrates. The resulting two-dimensional crystals adopt the 1H polymorph. The electronic structure is determined by angle-resolved photoemission spectroscopy and found to be in excellent agreement with density functional theory calculations. The single layer TaS$_2$ is found to be strongly n-dop...
Article
The structural and electronic properties of FeSe ultra-thin layers on Bi$_{2}$Se$_{3}$ have been investigated with a combination of scanning tunneling microscopy and spectroscopy and angle-resolved photoemission spectroscopy. The FeSe multi-layers, which are predominantly 3-5 monolayers (ML) thick, exhibit a hole pocket-like electron band at \bar{\...
Preprint
The structural and electronic properties of FeSe ultra-thin layers on Bi$_{2}$Se$_{3}$ have been investigated with a combination of scanning tunneling microscopy and spectroscopy and angle-resolved photoemission spectroscopy. The FeSe multi-layers, which are predominantly 3-5 monolayers (ML) thick, exhibit a hole pocket-like electron band at \bar{\...
Article
Full-text available
Through a combination of experimental techniques we show that the topmost layer of the topo- logical insulator TlBiSe$_2$ as prepared by cleavage is formed by irregularly shaped Tl islands at cryogenic temperatures and by mobile Tl atoms at room temperature. No trivial surface states are observed in photoemission at low temperatures, which suggests...
Thesis
Full-text available
Topological insulators (TIs) are a recently discovered class of materials. Their topologically protected edge states (TES) promise break-throughs in the fields of spintronics and quantum computation. Before TIs can be utilized, it is necessary to understand the consequences of topological protection, analyze the interaction of TES with its environm...
Article
Full-text available
The band structure and intra- and interband scattering processes of the electrons at the surface of a bismuth bilayer on Bi2Se3 have been experimentally investigated by low-temperature Fourier-transform scanning tunneling spectroscopy. The observed complex quasiparticle interference patterns are compared to a simulation based on the spin-dependent...
Article
Full-text available
The band structure, intra- and interband scattering processes of the electrons at the surface of a bismuth-bilayer on Bi$_2$Se$_3$ have been experimentally investigated by low-temperature Fourier-transform scanning tunneling spectroscopy. The observed complex quasiparticle interference patterns are compared to a simulation based on the spin-depende...
Article
We study the electronic screening mechanisms of the effective Coulomb on-site repulsion in hole-doped Sr_{14}Cu_{24}O_{41} compared to undoped La_{6}Ca_{8}Cu_{24}O_{41} using polarization dependent high-resolution resonant inelastic x-ray scattering at Cu M edges. By measuring the energy of the effective Coulomb on-site repulsion and the spin excit...
Article
Full-text available
A combined experimental and theoretical study of doping individual Fe atoms into Bi2Se3 is presented. It is shown through a scanning tunneling microscopy study that single Fe atoms initially located at hollow sites on top of the surface (adatoms) can be incorporated into subsurface layers by thermally-activated diffusion. Angle-resolved photoemissi...
Article
Full-text available
A topological insulator is a state of quantum matter that, while being an insulator in the bulk, hosts topologically protected electronic states at the surface. These states open the opportunity to realize a number of new applications in spintronics and quantum computing. To take advantage of their peculiar properties, topological insulators should...
Article
Full-text available
Optical excited molecules play an increasingly important role in research at light sources. Here we compare two approaches to structurally characterize such states, pumped-XAS and an innovative combination of EXAFS spectroscopy and resonant Raman scattering. The later combination allows to study efficiently charge-transfer complexes in their ground...
Article
An innovative combination of EXAFS spectroscopy and resonant Raman scattering for the characterization of the ground state and structural dynamics of a thermally stable binuclear bis(μ-oxo) dicopper(III) species has been demonstrated. Resonant Raman spectra at eleven excitation wavelengths have been collected by using several lasers and a spectrome...
Article
Increasing evidence suggests a central role for oxidative stress in the pathology of prion diseases, a group of fatal neurodegenerative disorders associated with structural conversion of the prion protein (PrP). Because UV-light-induced protein damage is mediated by direct photo-oxidation and radical reactions, we investigated the structural conseq...
Thesis
Full-text available
Within this diploma thesis, the influence of UV-light on two different samples was investigated: [Cu2L2(µ − O)2] I2 an artificial chemical complex, akin to tyrosinase and the first complex of its kind, which is stable at room temperature, as well as the influence of UV-light on murine and human prions. Via a resonance-Raman-study, the excitations...

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