A5002290563- Advanced Condensed Matter Physics
- Topological Materials and Phenomena
- Quantum, superfluid, helium dynamics
- Cold Atom Physics and Bose-Einstein Condensates
- Physics of Superconductivity and Magnetism
- Traditional and Medicinal Uses of Annonaceae
- Magnetic and transport properties of perovskites and related materials
- Organic and Molecular Conductors Research
- Iron-based superconductors research
- Semiconductor Quantum Structures and Devices
- Advanced Semiconductor Detectors and Materials
- Axial and Atropisomeric Chirality Synthesis
- Surface and Thin Film Phenomena
- Quantum optics and atomic interactions
- Multiferroics and related materials
- Earthquake Detection and Analysis
- Alkaloids: synthesis and pharmacology
- Electronic and Structural Properties of Oxides
- Photodynamic Therapy Research Studies
- Force Microscopy Techniques and Applications
- Biochemical and Structural Characterization
- Carbon Nanotubes in Composites
- Radical Photochemical Reactions
- 2D Materials and Applications
- Synthesis of heterocyclic compounds
University of Stuttgart
2015-2025
Center for Integrated Quantum Science and Technology
2015
Schott (Germany)
2002
University of Würzburg
1991-1999
Friedrich Schiller University Jena
1999
Temperature-dependent reflectivity measurements on the kagome metal ${\mathrm{CsV}}_{3}{\mathrm{Sb}}_{5}$ in a broad frequency range of $50\ensuremath{-}20\phantom{\rule{0.16em}{0ex}}000\phantom{\rule{4pt}{0ex}}{\mathrm{cm}}^{\ensuremath{-}1}$ down to $T$=10 K are reported. The charge-density wave (CDW) formed below ${T}_{\mathrm{CDW}}$ = 94 manifests itself prominent spectral-weight transfer from low higher energy regions. CDW gap 60--75 meV is observed at lowest temperature and shows...
The properties of kagome metals are governed by the interdependence band topology and electronic correlations resulting in remarkably rich phase diagrams. Here, we study temperature evolution bulk structure antiferromagnetic metal FeGe using infrared spectroscopy. We uncover drastic changes low-energy interband absorption at 100 K structural transition that has been linked to a charge-density-wave (CDW) instability. explain this effect minuscule Fe displacement plane, which results parallel...
The presence of magnetism in potentially altermagnetic <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:msub><a:mi>RuO</a:mi><a:mn>2</a:mn></a:msub></a:math> has been a subject intense debate. Using broadband infrared spectroscopy combined with density-functional band-structure calculations, we show that the optical conductivity <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"><b:msub><b:mi>RuO</b:mi><b:mn>2</b:mn></b:msub></b:math>, bulk probe its electronic structure, is best...
We show that for ultracold magnetic lanthanide atoms chaotic scattering emerges due to a combination of anisotropic interaction potentials and Zeeman coupling under an external field. This is studied in collaborative experimental theoretical effort both dysprosium erbium. present extensive atom-loss measurements their dense Feshbach-resonance spectra, analyze statistical properties, compare predictions from random-matrix-theory-inspired model. Furthermore, coupled-channels simulations the...
We report on the observation of weakly bound dimers bosonic dysprosium with a strong universal $s$-wave halo character, associated broad magnetic Feshbach resonances. These states surprisingly decouple from chaotic background narrow resonances, persisting across many such In addition they show highest reported moment $\ensuremath{\mu}\ensuremath{\simeq}20{\ensuremath{\mu}}_{\mathrm{B}}$ any ultracold molecule. analyze our findings using coupled-channel theory taking into account short range...
Temperature-dependent reflectivity studies on the nonmagnetic kagome metal ${\mathrm{RbV}}_{3}{\mathrm{Sb}}_{5}$ in a broad energy range ($50--20000{\mathrm{cm}}^{\ensuremath{-}1}$, equivalent to 6 meV--2.5 eV) down 10 K are reported. Below ${T}_{\mathrm{CDW}}=102$ K, optical spectra demonstrate prominent spectral-weight transfer from low higher energies as fingerprint of charge-density-wave (CDW) formation with opening partial gap. A detailed analysis reveals two scales respectively...
Abstract Coulomb repulsion among conduction electrons in solids hinders their motion and leads to a rise resistivity. A regime of electronic phase separation is expected at the first-order transition between correlated metal paramagnetic Mott insulator, but remains unexplored experimentally as well theoretically nearby T = 0. We approach this issue by assessing complex permittivity via dielectric spectroscopy, which provides vivid mapping deep insight into its microscopic nature. Our...
Shifting the Fermi level of celebrated $AM_3X_5$ (135) compounds into proximity flat bands strongly enhances electronic correlations and severely affects formation density waves superconductivity. Our broadband infrared spectroscopy measurements RbTi$_3$Bi$_5$ CsTi$_3$Bi$_5$ combined with density-functional band-structure calculations reveal that correlated Ti $d$-states are intricately coupled Bi $p$-states form a tilted Dirac crossing. Electron-phonon coupling manifests itself in strong...
The interplay between electronic correlations, density wave orders, and magnetism gives rise to several fascinating phenomena. In recent years, kagome metals have emerged as an excellent platform for investigating these unique properties, which stem from their itinerant carriers arranged in a lattice. Here, we show that structure of the prototypical metal, Fe$_3$Sn$_2$, can be tailored by manipulating breathing distortion its lattice with external pressure. is suppressed around 15 GPa...
Kagome metals possess peculiar optical spectra consisting of contributions from free charge carriers in a Drude-type response, localized seen as strongly temperature-dependent localization peak, and, some cases, phonons displaying strong anomalies. The rare-earth kagome metal series, $R$Mn$_6$Sn$_6$, provides marvelous playground to study the electronic properties presence variable magnetic order. Here, we report reflectivity studies on two members $R$Mn$_6$Sn$_6$ family, GdMn$_6$Sn$_6$...
The electronic properties of molecular conductors are varied by substituting ions with extended wave functions to enlarge the bandwidth W. This enables them cross Mott insulator-to-metal phase transition reducing correlations U / W .
Lectins and storage proteins from pea (Pisum sativum) other Leguminosae seeds interact in vitro. In order to evaluate whether this relationship may be important also vivo, the time course of biosynthesis these developing was followed. The appear following temporal order: vicilin-lectin-convicilin-legumin. protein synthesis followed by subcellular morphological changes occurring simultaneously. appearance vicilin coincides with formation regularly shaped globules within vacuole. Immediately...
The properties of kagome metals are governed by the interdependence band topology and electronic correlations resulting in remarkably rich phase diagrams. Here, we study temperature evolution bulk structure antiferromagnetic metal FeGe using infrared spectroscopy. We uncover drastic changes low-energy interband absorption at 100 K structural transition that has been linked to a charge-density-wave (CDW) instability. explain this effect minuscule Fe displacement plane, which results parallel...
We report temperature-dependent reflectivity spectra of the layered van der Waals magnet CrSBr in far-infrared region. Polarization-dependent measurements resolve vibrational modes along E$\|a$- and $b$-axes reveal clear structural anisotropy. While $a$-axis phonons notably harden on cooling, $b$-axis phonon frequencies are almost temperature-independent. A splitting due to antiferromagnetic phase transition is observed for 180~cm$^{-1}$ mode, accompanied by a softening below $T_N$....
Presence of magnetism in potentially altermagnetic RuO$_2$ has been a subject intense debate. Using broadband infrared spectroscopy combined with density-functional band-structure calculations, we show that optical conductivity RuO$_2$, the bulk probe its electronic structure, is well described by nonmagnetic model this material. The sharp Pauli edge demonstrates presence Dirac nodal line lying 45 meV below Fermi level. Good match between experimental and ab initio plasma frequencies...
The electronic properties of molecular conductors can be readily varied via physical or chemical pressure as it increases the bandwidth W; this enables crossing Mott insulator-to-metal phase transition by reducing correlations U/W. Here we introduce an alternative path increasing orbitals when partially replacing sulfur selenium in constituting bis-(ethylenedithio)-tetrathiafulvalene (BEDT-TTF) molecules title compound. We characterize tuning insulating quantum spin liquid state a to...
The coexistence of the charge-density wave (CDW) and superconducting phases their tunability under external pressure remains one key points in understanding electronic structure $A$V$_3$Sb$_5$ ($A$ = K, Rb, Cs) kagome metals. Here, we employ synchrotron-based infrared spectroscopy assisted by density-functional calculations to study evolution at room temperature up 17 GPa experimentally. optical spectrum CsV$_3$Sb$_5$ is characterized presence localized carriers seen as a broad peak finite...
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