A5012757489- Topological Materials and Phenomena
- Iron-based superconductors research
- Advanced Condensed Matter Physics
- Graphene research and applications
- 2D Materials and Applications
- Rare-earth and actinide compounds
- Physics of Superconductivity and Magnetism
- Quantum and electron transport phenomena
- Quantum many-body systems
- Semiconductor Quantum Structures and Devices
- Electronic and Structural Properties of Oxides
- Perovskite Materials and Applications
- Advancements in Semiconductor Devices and Circuit Design
- Chalcogenide Semiconductor Thin Films
- Advancements in Battery Materials
- Transition Metal Oxide Nanomaterials
- Magnetic and transport properties of perovskites and related materials
- Intellectual Capital and Performance Analysis
- MXene and MAX Phase Materials
- Corporate Taxation and Avoidance
- Advanced Battery Materials and Technologies
- Additive Manufacturing Materials and Processes
- Quantum, superfluid, helium dynamics
- Spectroscopy and Laser Applications
- Aerogels and thermal insulation
Chinese Academy of Sciences
2010-2024
University of Science and Technology of China
2008-2024
Huazhong University of Science and Technology
2017-2024
Jiangsu University of Science and Technology
2024
International Paper (United States)
2024
Fujian Institute of Research on the Structure of Matter
2023-2024
China Academy of Engineering Physics
2024
Wuhan National Laboratory for Optoelectronics
2019-2024
Southwest University of Science and Technology
2023-2024
Wuhan Institute of Technology
2023-2024
Three-dimensional (3D) Dirac point, where two Weyl points overlap in momentum space, is usually unstable and hard to realize. Here we show, based on the first-principles calculations effective model analysis, that crystalline ${A}_{3}$Bi ($A=\text{Na}$, K, Rb) are semimetals with bulk 3D protected by crystal symmetry. They possess nontrivial Fermi arcs surfaces can be driven into various topologically distinct phases explicit breaking of symmetries. Giant diamagnetism, linear quantum...
In three dimensional (3D) momentum space of solid crystal, a topological phase boundary separating the Chern insulating layers from normal may exist, where gap must be closed, resulting in "Chern semi-metal" state with topologically unavoidable band-crossings at fermi level. This state, if found to is condensed-matter realization chiral fermions (or called Weyl fermions) (3+1)D, and should exhibit remarkable features, like magnetic monopoles bulk arcs on surface. Here we predict, based...
The search for large-gap quantum spin Hall (QSH) insulators and effective approaches to tune QSH states is important both fundamental practical interests. Based on first-principles calculations we find two-dimensional tin films are with sizable bulk gaps of 0.3 eV, sufficiently large applications at room temperature. These can be effectively tuned by chemical functionalization external strain. mechanism the effect in this system band inversion Γ point, similar case a HgTe well. With surface...
The interplay between different ordered phases, such as superconducting, charge or spin is of central interest in condensed matter physics. very recent discovery superconductivity with a remarkable T$_c$= 26 K Fe-based oxypnictide La(O$_{1-x}$F$_x$)FeAs surprise to the scientific community\cite{Kamihara08}. pure LaOFeAs itself not superconducting but shows an anomaly near 150 both resistivity and dc magnetic susceptibility. Here we provide combined experimental theoretical evidences showing...
We demonstrate, using first-principles calculations, that the electronic structure of ${\mathrm{FeSe}}_{1\ensuremath{-}x}{\mathrm{Te}}_{x}\phantom{\rule{0.28em}{0ex}}(x=0.5)$ is topologically nontrivial and characterized by an odd ${\mathbb{Z}}_{2}$ invariant Dirac cone type surface states, in sharp contrast to end member FeSe $(x=0)$. This topological state induced enhanced three-dimensionality spin-orbit coupling due Te substitution (compared FeSe), a band inversion at $Z$ point Brillouin...
As one of the simplest systems for realizing Majorana fermions, topological superconductor plays an important role in both condensed matter physics and quantum computations. Based on ab initio calculations analysis effective 8-band model with superconducting pairing, we demonstrate that three-dimensional extended s-wave Fe-based superconductors such as Fe_{1+y}Se_{0.5}Te_{0.5} have a metallic topologically nontrivial band structure, exhibit normal-topological-normal superconductivity phase...
Abstract Layered transition-metal dichalcogenides have emerged as exciting material systems with atomically thin geometries and unique electronic properties. Pressure is a powerful tool for continuously tuning their crystal structures away from the pristine states. Here, we systematically investigated pressurized behavior of MoSe 2 up to ∼60 GPa using multiple experimental techniques ab-initio calculations. evolves an anisotropic two-dimensional layered network three-dimensional structure...
In a kagome lattice, the time reversal symmetry can be broken by staggered magnetic flux emerging from ferromagnetic ordering and intrinsic spin-orbit coupling, leading to several well-separated nontrivial Chern bands quantum anomalous Hall effect. Based on this idea ab initio calculations, we propose realization of effect in single layer Cs_{2}Mn_{3}F_{12} lattice (001) surface Cs_{2}LiMn_{3}F_{12} crystal modifying carrier coverage it, where band gap is around 20 meV. Moreover, simplified...
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.
Operation speed and coherence time are two core measures for the viability of a qubit. Strong spin-orbit interaction (SOI) relatively weak hyperfine make holes in germanium (Ge) intriguing candidates spin qubits with rapid, all-electrical coherent control. Here we report ultrafast single-spin manipulation hole-based double quantum dot hut wire (GHW). Mediated by strong SOI, Rabi frequency exceeding 540 MHz is observed at magnetic field 100 mT, setting record qubit control semiconductor...
Abstract Sodium metal batteries (NMBs) have attracted increasing attention as next‐generation rechargeable batteries. How to improve their cycling stability and safety under limited sodium excess conditions, ideally zero (i.e., anode‐free architecture), is highly desired yet remains challenging. Herein, it demonstrated that formate (HCOONa), one component of the solid electrolyte interphase (SEI) naturally formed on anode, a promising candidate for designing high‐performance artificial SEI...
The discovery of charge density wave (CDW) order in the kagome-lattice superconductor $A$V${}_{3}$Sb${}_{5}$ is interesting because potential interplay between CDW and superconductivity. This paper demonstrates that associated with a sudden hardening longitudinal optical phonon mode at ordering vector, thus establishing vector dependent electron-phonon coupling must play an important role $A$V${}_{3}$Sb${}_{5}$.
Kagome materials often host exotic quantum phases, including spin liquids, Chern gap, charge order, and superconductivity. Existing scanning microscopy studies of the kagome order have been limited to non-kagome surface layers. Here we tunnel into lattice FeGe uncover features order. Our spectroscopic imaging identifes a 2x2 in magnetic lattice, resembling that discovered superconductors. Spin-mapping across steps unit-cell-height demonstrates this emerges from spin-polarized electrons with...
By first-principles calculations, we present a doping-dependent phase diagram of the LaOMAs (M=V–Cu) family. It is characterized as antiferromagnetic semiconductor around LaOMnAs side and ferromagnetic metal LaOCoAs. Both LaOFeAs LaONiAs, where superconductivity were discovered, are located at borderline magnetic phases. An extensive Fermi surface analysis suggests that observed electron type in its origin. We discuss possible pairing mechanisms context competing phases found this work spin...
Ir$_{1-x}$Pt$_x$Te$_2$ is an interesting system showing competing phenomenon between structural instability and superconductivity. Due to the large atomic numbers of Ir Te, spin-orbital coupling expected be strong in which may lead nonconventional We grew single crystal samples this investigated their electronic properties. In particular, we performed optical spectroscopic measurements, combination with density function calculations, on undoped compound IrTe$_2$ effort elucidate origin phase...
Analogs of the elementary particles, Dirac fermions in condensed matter, have received extensive attention for both scientific interest and device applications. In this Rapid Communication, we study semimetals (DSMs) magnetic space groups (MSGs), find a category DSMs centrosymmetric type-IV MSGs, where points (DPs) are protected by inversion symmetry, nonsymmorphic time-reversal suitable rotation symmetry. Moreover, propose interlayer antiferromagnetic (AFM) material...
We propose a realization of the lattice-symmetry-assisted second-order topological superconductors with corner Majorana zero modes (MZM) based on two-dimensional insulators (2DTI). The lattice symmetry can naturally lead to anisotropic coupling edge states along different directions in-plane magnetic field and conventional $s$-wave pairings, thus leading single MZM located at corners for various patterns. In particular, we focus 2DTI ${D}_{3d}$ found types gap opening armchair zigzag edges...
Layered transition metal chalcogenides with large spin orbit coupling have recently sparked much interest due to their potential applications for electronic, optoelectronic, spintronics, and valleytronics. However, most current understanding of the electronic structure near band valleys in momentum space is based on either theoretical investigations or optical measurements, leaving detailed elusive. For example, exact position conduction valley bulk MoS2 remains controversial. Here, using...
Magnetic topological semimetals (TSMs) are quantum materials with broken time-reversal symmetry (TRS) and isolated nodal points or lines near the Fermi level. Their properties would typically reveal from bulk-edge correspondence principle as nontrivial surface states such arcs drumhead states, etc. Depending on degeneracies distribution of nodes in crystal momentum space, TSMs usually classified into Weyl (WSMs), Dirac (DSMs), nodal-line (NLSMs), triple-point (TPSMs), In this review article,...
The interplay between electronic correlations and topological protection may offer a rich avenue for discovering emergent quantum phenomena in condensed matter. However, have so far been little investigated Weyl semimetals (WSMs) by experiments. Here, we report combined optical spectroscopy theoretical calculation study on the strength of kagome magnet Co3Sn2S2 influence its WSM state expected within single-particle picture. kinetic energy estimated from our data is about half that obtained...