A5042783006- Magnetic and transport properties of perovskites and related materials
- 2D Materials and Applications
- Advanced Condensed Matter Physics
- Topological Materials and Phenomena
- Physics of Superconductivity and Magnetism
- Multiferroics and related materials
- Graphene research and applications
- Iron-based superconductors research
- Electronic and Structural Properties of Oxides
- Atomic and Subatomic Physics Research
- Magnetic properties of thin films
- MXene and MAX Phase Materials
- Perovskite Materials and Applications
- Theoretical and Computational Physics
- Quantum Dots Synthesis And Properties
- Rare-earth and actinide compounds
- Advanced Memory and Neural Computing
- Gas Sensing Nanomaterials and Sensors
- Quantum, superfluid, helium dynamics
- High-pressure geophysics and materials
- Electrical and Thermal Properties of Materials
- Magnetic Properties of Alloys
- Diamond and Carbon-based Materials Research
Peng Cheng Laboratory
2025
Sun Yat-sen University
2022-2024
Arising from the extreme/saddle point in electronic bands, Van Hove singularity (VHS) manifests divergent density of states (DOS) and induces various new matter such as unconventional superconductivity. VHS is believed to exist one two dimensions, but rarely found three dimension (3D). Here, we report discovery 3D a topological magnet EuCd
We investigate the magnetoelectric properties of monolayer NiX$_{2}$ (X = Br, I) through first-principles calculations. Our calculations predict that NiBr$_{2}$ exhibits a cycloidal magnetic ground state. For NiI$_{2}$ monolayer, proper-screw helical state with modulation vector \(\boldsymbol{Q} (q, 0, 0)\) is adopted, approximated based on experimental observations. The electric polarization in shows linear dependence spin-orbit coupling strength \(\lambda_{\text{SOC}}\), which can be...
The discovery of ambient-pressure superconductivity with $T_{c,\text{onset}} > 40$ K in La$_3$Ni$_2$O$_7$ (LNO) thin films under in-plane biaxial compressive strain underscores the pivotal role epitaxial tuning exotic electronic states and provides a unique platform for investigating superconducting mechanisms nickelate superconductors. Here, we use resonant inelastic X-ray scattering (RIXS) to probe strain-dependent spin excitations LNO ranging from $\epsilon\approx-1.04\%$ $1.91\%$....
After several decades of studies high-temperature superconductivity, there is no compelling theory for the mechanism yet; however, spin fluctuations have been widely believed to play a crucial role in forming superconducting Cooper pairs. The recent discovery superconductivity near 80 K bilayer nickelate La$_3$Ni$_2$O$_7$ under pressure provides new platform elucidate origins superconductivity. We perform elastic and inelastic neutron scattering on polycrystalline sample...
Tuning the Gilbert damping of ferromagnetic (FM) metals via a nonvolatile way is importance to exploit and design next-generation novel spintronic devices. Through systematical first-principles calculations, we study magnetic properties van der Waals heterostructure two-dimensional FM metal CrTe2 ferroelectric (FE) In2Te3 monolayers. The ferromagnetism maintained in CrTe2/In2Te3 its easy axis can be switched from in-plane out-of-plane by reversing FE polarization In2Te3. Excitingly, find...
Recently, there has been a rapidly growing interest in two-dimensional (2D) transition metal chalcogenide monolayers (MLs) due to their unique magnetic and electronic properties. By using an evolutionary algorithm first-principles calculations, we report the discovery of previously unexplored, chemically, energetically, thermodynamically stable 2D antiferromagnetic (AFM) CrSe ML with N\'eel temperature higher than room temperature. Remarkably, predict electric field-controllable...
The kagome antiferromagnetic metal FeSn has become an attractive platform for the exploration of novel electronic states such as topological Dirac and formation flat bands by localized electrons. Apart from properties, magnons magnon have also been proposed applying simplified Heisenberg models to magnetic systems. Inelastic neutron scattering studies on found well-defined dispersions at low energies, but high energies are strongly damped, which cannot be explained spin models. In this...
Recently, the topological nature of an antiferromagnet YbMnBi2 has been controversial. is regarded as a candidate Type-II Weyl semimetals with magnetic moments Mn atoms canting about 10{\deg} in some studies but Dirac semimetal without others. By means systematical density functional theory calculations, we show perfect bulk collinear antiferromagnetic ordering and, naturally, it semimetal. Considering vital role moment generating state, artificially cant and find that enters into state from...
Quasi-one-dimensional iron chalcogenides possess various magnetic states depending on the lattice distortion, electronic correlations, and presence of defects. We present neutron diffraction inelastic scattering experiments spin ladder compound BaFe$_{2-\delta}$S$_{1.5}$Se$_{1.5}$ with $\sim$6% vacancies. The data reveal that long-range order is absent, while characteristic excitations correspond to both stripe- block-type antiferromagnetic correlations are observed. First-principles...
Two-dimensional (2D) magnetic materials with nontrivial topological states have recently drawn considerable attention. Among them, 2D metal-organic frameworks (MOFs) are standing out due to their advantages such as the easy synthesis in practice and less sensitivity oxidation that distinctly different from inorganic materials. By means of density-functional theory calculations, we systematically investigate electronic properties a class MOFs X(C21H15N3) (X = transition metal element 3d 5d)....
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The intricate correlation between lattice geometry, topological behavior and charge degrees of freedom plays a key role in determining the physical chemical properties quantum-magnetic system. Herein, we investigate introduction unusual oxidation state as an alternative pathway to modulate magnetic ground well-known S = 1 Haldane system nickelate Y2BaNiO5 (YBNO). YBNO is topologically reduced incorporate d9-Ni+ (S 1/2) one-dimensional chain random distribution Ni+ for first time results...
The recent discovery of high-temperature superconductivity in high-pressurized La$_3$Ni$_2$O$_{7-\delta}$ has garnered significant attention. Using density functional theory, we investigate the magnetic properties La$_3$Ni$_2$O$_7$ at ambient pressure. Our calculations suggest that with $\delta=0$, double spin stripe phase is favored as ground state. Oxygen vacancies may effectively turn nearest Ni spins into charge sites. Consequently, moderate $\delta$ values, our theoretical state...
Arising from the extreme or saddle point in electronic bands, Van Hove singularity (VHS) strongly enhances correlation its vicinity and leads to various new states of matter such as density wave unconventional superconductivity. In contrast divergent (DOS) one two dimensions, VHS is generally non-divergent three dimension (3D). Here we report observation 3D a topological magnet EuCd2As2 by magneto-infrared spectroscopy. The generated substantially tuning energy dispersion momentum...
Recently, there has been a rapidly growing interest in two-dimensional (2D) transition metal chalcogenide monolayers (MLs) due to their unique magnetic and electronic properties. By using an evolutionary algorithm first-principles calculations, we report the discovery of previously unexplored, chemically, energetically, thermodynamically stable 2D antiferromagnetic (AFM) CrSe ML with Néel temperature higher than room temperature. Remarkably, predict electric field-controllable...
Two-dimensional (2D) magnetic materials with nontrivial topological states have drawn considerable attention recently. Among them, 2D metal-organic frameworks (MOFs) are standing out due to their advantages, such as the easy synthesis in practice and less sensitivity oxidation that distinctly different from inorganic materials. By means of density-functional theory calculations, we systematically investigate electronic properties a class MOFs X(C21H15N3) (X = transition metal element 3d 5d)....
Kagome antiferromagnetic metal FeSn has become an attracting platform for the exploration of novel electronic states, such as topological Dirac states and formation flat bands by localized electrons. Apart from properties, magnons magnon have also been proposed applying simplified Heisenberg models to kagome magnetic systems.Inelastic neutron scattering studies on found well defined dispersions at low energies,but high energies are strongly dampled, which can not be explained spin models. In...