A5010555835- Topological Materials and Phenomena
- Magnetic properties of thin films
- Iron-based superconductors research
- 2D Materials and Applications
- Rare-earth and actinide compounds
- Advanced Condensed Matter Physics
- MXene and MAX Phase Materials
- Inorganic Chemistry and Materials
- Semiconductor materials and interfaces
- Intermetallics and Advanced Alloy Properties
- Advanced Fiber Optic Sensors
- Microwave and Dielectric Measurement Techniques
- Magnetic Properties of Alloys
- Cold Atom Physics and Bose-Einstein Condensates
- Chalcogenide Semiconductor Thin Films
- Power Line Communications and Noise
- Heusler alloys: electronic and magnetic properties
- Electrocatalysts for Energy Conversion
- Advanced Thermoelectric Materials and Devices
- Physics of Superconductivity and Magnetism
RIKEN Center for Emergent Matter Science
2022-2025
National Taiwan University
2022-2025
National Center for Theoretical Sciences
2022-2024
In order to solve the problem of deviation in continuous annealing unit strip steel, section, deviation-sensitive process parameters, and incoming material parameters were analyzed judged from perspectives characteristics, plate passing characteristics. Based on analysis results, an indicator set was established; Subsequently, based random forest (RF) algorithm unit’s historical production data, RF annealed prediction model established compared with same type regression algorithms verify...
In a multivalley electronic band structure, lifting of the valley degeneracy is associated with rotational symmetry breaking in fluid and may emerge through spontaneous order or large response to small external perturbation such as strain. this work, we use scanning tunneling microscopy investigate an unexpected Landau levels formed unusual floating surface ZrSiS. We visualize ubiquitous splitting into valley-polarized sublevels. demonstrate methods measure valley-selective level...
The electronic structure of compensated antiferromagnets (CAF) creates large functional responses, reminiscent ferromagnets and suitable for data storage readout, despite (nearly) net-zero spontaneous magnetization. Many experimental signatures CAF - such as giant thermoelectric Nernst effects should be enhanced when two or more bands are nearly degenerate in vicinity the Fermi energy. Here, we report a zero-field, effect >1 μV/K CoNb3S6 its tiny net magnetization ~2 milli − μB. As drivers...
The recent discovery of long-range magnetic orders in atomically thin semiconductors ${\mathrm{Cr}}_{2}{\mathrm{Ge}}_{2}{\mathrm{Te}}_{6}$ and $\mathrm{Cr}{\mathrm{I}}_{3}$ as well metal ${\mathrm{Fe}}_{3}\mathrm{Ge}{\mathrm{Te}}_{2}$ has opened up exciting opportunities for fundamental physics two-dimensional (2D) magnetism also technological applications based on 2D materials. To exploit these metallic magnets, the mechanisms that control their physical properties should be understood. In...
Antiferromagnetic FeSn is considered to be a close realization of the ideal two-dimensional (2D) kagome lattice, hosting Dirac cones, van Hove singularities, and flat bands, as it comprises ${\mathrm{Fe}}_{3}\mathrm{Sn}$ layers well separated by Sn buffer layers. We observe pronounced optical anisotropy, with low-energy conductivity being surprisingly higher perpendicular planes than along This finding contradicts prevalent picture dominantly 2D electronic structure for FeSn. Our...
Materials carrying topological surface states (TSS) provide a fascinating platform for the hydrogen evolution reaction (HER). Based on systematic first-principles calculations ${A}_{3}B$ ($A$ = Ni, Pd, Pt; $B$ Si, Ge, Sn), we propose that electric polarization characterized by Zak phase can be crucial to designing efficient catalysts HER. For ${A}_{3}B$, show takes nontrivial value of $\ensuremath{\pi}$ in whole (111) projected Brillouin zone, which causes quantized charges at surface....
Giant anomalous Hall effect (AHE) and magneto-optical activity can emerge in magnets with topologically non-trivial degeneracies. However, identifying the specific band structure features like Weyl points, nodal lines or planes which generate response is a challenging issue. Since low-energy interband transitions govern static AHE, we addressed this question prototypical magnetic semimetal Co$_3$Sn$_2$S$_2$ also hosting by broadband polarized reflectivity Kerr spectroscopy focus on...
Antiferromagnetic FeSn is considered to be a close realization of the ideal two-dimensional (2D) kagome lattice, hosting Dirac cones, van Hove singularities, and flat bands, as it comprises Fe$_3$Sn layers well separated by Sn buffer layers. We observe pronounced optical anisotropy, with low-energy conductivity being surprisingly higher perpendicular planes than along This finding contradicts prevalent picture dominantly 2D electronic structure for FeSn. Our material-specific theory...
We perform a systematic ab initio study on phonon-mediated superconductivity in the transition-metal-based superconductors Sc$_6M$Te$_2$ ($M$ = Fe, Co, Ni). Firstly, our charge analysis reveals significant electron transfer from Sc to $M$ due substantial difference electronegativity, filling 3$d$ orbitals of and suppressing magnetic instability. Secondly, we show that Sc$_6$FeTe$_2$ exhibits strong lattice anharmonicity. Moreover, for $M =$ Fe find low-frequency soft phonon bands which can...
Topological magnets exhibit fascinating properties like topologically protected surface states or anomalous transport phenomena. While these can be significantly altered by manipulating the magnetic state, experimental verification of such predictions remains challenging. Here, we demonstrate efficient field control Weyl semimetallic state collinear ferromagnet Co$_3$Sn$_2$S$_2$ magneto-optical spectroscopy. We resolve a redshift nodal loop resonance as magnetization is rotated into kagome...
In a multi-valley electronic band structure, lifting of the valley degeneracy is associated with rotational symmetry breaking in fluid, and may emerge through spontaneous order, or large response to small external perturbation such as strain. this work we use scanning tunneling microscopy investigate an unexpected Landau levels formed unusual floating surface ZrSiS. We visualize ubiquitous splitting into valley-polarized sub-levels. demonstrate methods measure valley-selective level...
Giant anomalous Hall effect (AHE) and magneto-optical activity can emerge in magnets with topologically non-trivial degeneracies. However, identifying the specific band structure features like Weyl points, nodal lines or planes which generate response is a challenging issue. Since low-energy interband transitions govern static AHE, we addressed this question prototypical magnetic semimetal Co$_3$Sn$_2$S$_2$ also hosting by broadband polarized reflectivity Kerr spectroscopy focus on...