A5007540111- Topological Materials and Phenomena
- Advanced Condensed Matter Physics
- Rare-earth and actinide compounds
- Physics of Superconductivity and Magnetism
- Iron-based superconductors research
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum, superfluid, helium dynamics
- Magnetic and transport properties of perovskites and related materials
- Quantum and electron transport phenomena
- Theoretical and Computational Physics
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Graphene research and applications
- Inorganic Chemistry and Materials
- Magnetic Properties of Alloys
- Boron and Carbon Nanomaterials Research
- High-pressure geophysics and materials
- Intermetallics and Advanced Alloy Properties
- High Entropy Alloys Studies
- 2D Materials and Applications
- Nuclear materials and radiation effects
- Thermal Expansion and Ionic Conductivity
- Hydrogen Storage and Materials
- Phase-change materials and chalcogenides
- Ferroelectric and Piezoelectric Materials
Chinese Academy of Sciences
2021-2025
Institute of Physics
2021-2025
University of Chinese Academy of Sciences
2021-2024
Czech Academy of Sciences, Institute of Physics
2021-2024
National Laboratory for Superconductivity
2023-2024
The Kagome superconductors AV3Sb5 (A=K, Rb, Cs) have received enormous attention due to their nontrivial topological electronic structure, anomalous physical properties and superconductivity. Unconventional charge density wave (CDW) has been detected in AV3Sb5. High-precision structure determination is essential understand its origin. Here we unveil nature of the CDW phase our high-resolution angle-resolved photoemission measurements on KV3Sb5. We observed CDW-induced Fermi surface...
CsV${}_{3}$Sb${}_{5}$ has been recently discovered to be a kagome superconductor. Here, the authors use scanning tunneling microscopy study its charge order and superconductivity at atomic scale. Through mapping energy gap of order, identify chiral electronic nature. They also elucidate surface nature 1$\ifmmode\times\else\texttimes\fi{}$4 superlattice superconducting excitations.
Superconductors with kagome lattices have been identified for over 40 years, a superconducting transition temperature ${T}_{c}$ up to 7 K. Recently, certain superconductors found exhibit an exotic charge order, which intertwines superconductivity and persists being one order of magnitude higher than ${T}_{c}$. In this work, we use scanning tunneling microscopy study the in superconductor $\mathrm{Rb}{\mathrm{V}}_{3}{\mathrm{Sb}}_{5}$. We observe both $2\ifmmode\times\else\texttimes\fi{}2$...
In crystalline materials, electron-phonon coupling (EPC) is a ubiquitous many-body interaction that drives conventional Bardeen-Cooper-Schrieffer superconductivity. Recently, in new kagome metal $\rm{CsV_3Sb_5}$, superconductivity possibly intertwines with time-reversal and spatial symmetry-breaking orders observed. Density functional theory calculations predicted weak EPC strength,$\lambda$, supporting an unconventional pairing mechanism $\rm{CsV_3Sb_5}$. However, experimental determination...
Motived by time-reversal symmetry breaking and giant anomalous Hall effect in kagome superconductor \textit{A}V$_3$Sb$_5$ (\textit{A} = Cs, K, Rb), we carried out the thermal transport measurements on CsV$_3$Sb$_5$. In addition to effect, Nernst emerge. Interestingly, longitudinal conductivity $\kappa_{xx}$ largely deviates from electronic contribution obtained $\sigma_{xx}$ Wiedemann-Franz law. contrast, $\kappa_{xy}$ is roughly consistent with law contribution. All these results indicate...
Abstract Condensed matter physics has often provided a platform for investigating the interplay between particles and fields in cases that have not been observed high-energy physics. Here, using angle-resolved photoemission spectroscopy, we provide an example of this by visualizing electronic structure noncentrosymmetric magnetic Weyl semimetal candidate NdAlSi both paramagnetic ferrimagnetic states. We observe surface Fermi arcs bulk fermion dispersion as well emergence new fermions state....
We report the magnetic properties of newly synthesized, single crystals ${\mathrm{TbTi}}_{3}{\mathrm{Bi}}_{4}$ whose crystal structure is highlighted by stacking terbium-based zigzag chains and titanium-based kagome lattices. This compound demonstrates extreme easy-axis anisotropy due to crystalline-electric-field effect which aligns ${\mathrm{Tb}}^{3+}$ moments along chain direction. As result strong single-ion multiple interactions, behaves as a quasi-one-dimensional Ising magnet with...
Non-Hermitian physics, studying systems described by non-Hermitian Hamiltonians, reveals unique phenomena not present in Hermitian systems. Unlike systems, have complex eigenvalues, making their effects less directly observable. Recently, significant efforts been devoted to incorporating the into condensed matter physics. However, progress is hindered absence of a viable experimental approach. Here, discovery surface-selectively spontaneous reconstructed Weyl semimetal NdAlSi provides...
Materials with a kagome lattice structure display wealth of intriguing magnetic properties due to their geometric frustration and intrinsically flat band structure. Recently, topological superconducting states have also been observed in systems. The may host ``breathing'' mode that leads charge density wave (CDW) states, if there is strong electron-phonon coupling, electron-electron interaction, or external excitation the material. This can give rise candidate distortions such as star David...
Abstract Solid-state refrigeration based on the caloric effect is viewed as a promising efficient and clean technology. Barocaloric materials were developed rapidly but have since encountered general obstacle: prominent cannot be utilized reversibly under moderate pressure. Here, we report mechanism of an emergent large, reversible barocaloric (BCE) low pressure in hybrid organic–inorganic layered perovskite (CH 3 –(CH 2 ) n −1 –NH MnCl 4 ( = 9,10), which show entropy change high Δ S r ∼...
Superconductivity in V-based kagome metals has recently raised great interest as they exhibit the competing ground states associated with flat bands and topological electronic structures. Here we report discovery of superconductivity ${\mathrm{Ta}}_{2}{\mathrm{V}}_{3.1}{\mathrm{Si}}_{0.9}$ a superconducting transition temperature ${T}_{c}$ 7.5 K, record high for at ambient pressure. While V ions form two-dimensional breathing structure, length difference between two different V-V bonds is...
Understanding and mastering the control of surface states in topological materials are crucial steps for development future electronic devices technologies that leverage unique properties these materials. Here, using angle-resolved photoemission spectroscopy, we provide a good case study this by visualizing structure magnetic Weyl semimetal on both flat uneven surfaces. Our observations reveal preparation an sample can effectively suppress all NdAlSi, including Fermi arcs. This results...
Non-Hermitian physics, studying systems described by non-Hermitian Hamiltonians, reveals unique phenomena not present in Hermitian systems. Unlike systems, have complex eigenvalues, making their effects less directly observable. Recently, significant efforts been devoted to incorporating the into condensed matter physics. However, progress has hindered absence of a viable experimental approach. Here, discovery surface-selectively spontaneous reconstructed Weyl semimetal NdAlSi provides...
Emergent phases often appear when the electronic kinetic energy is comparable to Coulomb interactions. One approach seek material systems as hosts of such emergent realize localization wavefunctions due geometric frustration inherent in crystal structure, resulting flat bands. Recently, efforts have found a wide range exotic two-dimensional kagome lattice, including magnetic order, time-reversal symmetry breaking charge nematicity, and superconductivity. However, interlayer coupling layers...
In crystalline materials, electron-phonon coupling (EPC) is a ubiquitous many-body interaction that drives conventional Bardeen-Cooper-Schrieffer superconductivity. Recently, in new kagome metal $\rm{CsV_3Sb_5}$, superconductivity possibly intertwines with time-reversal and spatial symmetry-breaking orders observed. Density functional theory calculations predicted weak EPC strength,$λ$, supporting an unconventional pairing mechanism $\rm{CsV_3Sb_5}$. However, experimental determination of...
The newly discovered Kagome superconductors AV$_3$Sb$_5$ (A=K, Rb and Cs) continue to bring surprises in generating unusual phenomena physical properties, including anomalous Hall effect, unconventional charge density wave, electronic nematicity time-reversal symmetry breaking. Here we report an unexpected emergence of multiple flat bands the superconductors. By performing high-resolution angle-resolved photoemission (ARPES) measurements, observed four branches that span over entire momentum...
We report the magnetic properties of newly synthesized, single crystals $\mathrm{TbTi_3Bi_4}$ whose crystal structure is highlighted by stacking terbium-based zigzag chains and titanium-based kagome lattices. This compound demonstrates extreme easy-axis anisotropy due to crystalline-electric-field effect which aligns $\mathrm{Tb^{3+}}$ moments along chain direction. As result strong single-ion multiple interactions, behaves as a quasi-one-dimensional Ising magnet with remarkable...
Superconductivity involving finite momentum pairing can lead to spatial gap and pair density modulations, as well Bogoliubov Fermi states within the superconducting gap. However, experimental realization of their intertwined relations has been challenging. Here, we detect chiral kagome superconductivity modulations with residual arcs in KV3Sb5 CsV3Sb5 by normal Josephson scanning tunneling microscopy down 30mK resolved electronic energy difference at microelectronvolt level. We observe a...
Abstract The Kagome superconductors AV 3 Sb 5 (A=K, Rb, Cs) have received enormous attention due to their nontrivial topological electronic structure, anomalous physical properties and superconductivity. Unconventional charge density wave (CDW) has been detected in that is found be intimately intertwined with the Hall effect High-precision structure determination essential understand origin of CDW transition its interplay electron correlation, topology superconductivity, yet, little evidence...
<title>Abstract</title> As a critical reinforcing phase in matrix and coating materials, enhancing the hardness of TiFe<sub>2</sub> significantly improves upper limits alloy performance through low-concentration doping. However, mechanism by which doping alters macroscopic disturbance electronic structure remains unclear. Furthermore, there is lack robust experimental evidence to substantiate enhancements predicted theoretical calculations. This investigation assessed strengthening effect...