A5014346652- Topological Materials and Phenomena
- Graphene research and applications
- 2D Materials and Applications
- Magnetic properties of thin films
- Advanced Condensed Matter Physics
- Quantum and electron transport phenomena
- Electronic and Structural Properties of Oxides
- Heusler alloys: electronic and magnetic properties
- Physics of Superconductivity and Magnetism
- MXene and MAX Phase Materials
- Atomic and Subatomic Physics Research
- Covalent Organic Framework Applications
- Magnetic and transport properties of perovskites and related materials
- Quantum many-body systems
- Rare-earth and actinide compounds
- Quantum Mechanics and Non-Hermitian Physics
- Quantum, superfluid, helium dynamics
- RNA modifications and cancer
- Semiconductor materials and devices
- Diamond and Carbon-based Materials Research
- Electromagnetic Simulation and Numerical Methods
- Iron-based superconductors research
- Advanced Materials Characterization Techniques
- Surface and Thin Film Phenomena
- Machine Learning in Materials Science
Beijing Institute of Technology
2017-2025
Kunming Third People's Hospital
2019
China Academy of Engineering Physics
2017-2018
University of Jinan
2013-2017
We demonstrate the emergence of a pronounced thermal transport in recently discovered class magnetic materials—altermagnets. From symmetry arguments and first-principles calculations performed for showcase altermagnet, RuO2, we uncover that crystal Nernst Hall effects this material are very large strongly anisotropic with respect to Néel vector. find originate from three sources Berry's curvature momentum space: Weyl fermions due crossings between well-separated bands, strong spin-flip...
Spintronics, a technology harnessing electron spin for information transmission, offers promising avenue to surpass the limitations of conventional electronic devices. While directly interacts with magnetic field, its control through electric field is generally more practical, and has become focal point in field. Here, we propose mechanism realize static almost uniform effective by gate-electric Our method employs two-dimensional altermagnets valley-mediated spin-layer coupling (SLC), which...
Quantum spin Hall (QSH) effect is promising for achieving dissipationless transport devices which can be achieved only at extremely low temperature presently. The research new large-gap QSH insulators critical their realistic applications room temperature. Based on first-principles calculations, we propose a insulator with sizable bulk gap as large ∼0.22 eV in stanene film functionalized the organic molecule ethynyl (SnC2H), whose topological electronic properties are highly tunable by...
Two-dimensional (2D) materials have attracted great attention and spurred rapid development in both fundamental research device applications. The search for exotic physical properties, such as magnetic topological order, 2D could enable the realization of novel quantum devices is therefore at forefront science. Here, we report discovery twofold degenerate Weyl nodal lines a ferromagnetic material, single-layer gadolinium-silver compound, based on combined angle-resolved photoemission...
Abstract Manipulating valley-dependent Berry phase effects provides remarkable opportunities for both fundamental research and practical applications. Here, by referring to effective model analysis, we propose a general scheme realizing topological magneto-valley transitions. More importantly, using valley-half-semiconducting VSi 2 N 4 as an outstanding example, investigate sign change of which drive the change-in-sign valley anomalous transport characteristics via external means such...
Abstract Benefited from the lower dimensionality compared to their 3D counterpart, 2D flat‐band systems provide cleaner lattice models, easier experimental verification, and higher tunability, which make van der Waals (vdW) system an ideal playground for exploring physics as well potential applications. Given vast amount of research in field flat bands, a simple efficient approach search realistic vdW materials with bands is still missing. Here, two‐tier framework filter diagnose...
A real Chern insulator (RCI) featuring a number and second-order boundary mode appears in two-dimensional (2D) system with the space-time inversion symmetry $(\mathcal{PT})$. Here, we propose kind of RCI: mirror (MRCI), which emerges from having additional horizontal ${\mathcal{M}}_{z}$. The MRCI generally is characterized by two independent numbers, respectively defined subsystems system. Hence, may host modes different conventional RCI. We show that for spinless systems, definition...
Spin-gapless semimetals (SGSMs), which generate 100% spin polarization, are viewed as promising semi-half-metals in spintronics with high speed and low consumption. We propose characterize a new ${\mathbb{Z}}_{2}$ class of topological nodal line (TNL) SGSMs. The proposed TNLSGSMs protected by space-time inversion symmetry or glide mirror two-dimensional (2D) fully spin-polarized nearly flat surface states. Based on first-principles calculations effective model analysis, series high-quality...
Two-dimensional checkerboard lattice, the simplest line-graph has been intensively studied as a toy model, while material design and synthesis remain elusive. Here, we report theoretical prediction experimental realization of lattice in monolayer Cu2N. Experimentally, Cu2N can be realized well-known N/Cu(100) N/Cu(111) systems that were previously mistakenly believed to insulators. Combined angle-resolved photoemission spectroscopy measurements, first-principles calculations, tight-binding...
In three dimensions, quasi-one-dimensional (Q1D) transport has traditionally been associated with systems featuring a Q1D chain structure. Here, based on first-principle calculations, we go beyond this understanding to show that the can also be realized in certain three-dimensional (3D) altermagnetic (AM) metals topological nodal net momentum space but lacking structure real space, including existing compounds β-Fe_{2}(PO_{4})O, Co_{2}(PO_{4})O, and LiTi_{2}O_{4}. These materials exhibit an...
Topological semimetals in ferromagnetic materials have attracted enormous attention due to the potential applications spintronics. Using first-principles density functional theory together with an effective lattice model, here we present a new family of topological fully spin-polarized nodal loop alkaline-metal monochalcogenide $MX$ ($M$ = Li, Na, K, Rb, Cs; $X$ S, Se, Te) monolayers. The half-metallic ferromagnetism can be established monolayers, which one formed by two crossing bands same...
Nodal monoloop, enjoying the cleanest scenario with a single loop, is recognized as basic building block of intricate linked loops including chains, nets, and knots. Here, we explore interplay magnetic ordering band topology in one system by introducing brand-new quantum state, referred to Weyl monoloop semi-half-metal, which characterized loop at Fermi level stemming from same spin channel. Such nodal line Fermion, yielding 100% polarization, protected mirror (Mz) symmetry. As prominent...
Hydrogen, a simple and magic element, has attracted increasing attention for its effective incorporation within solids powerful manipulation of electronic states. Here, we show that hydrogenation tackles common problems in two-dimensional borophene, e.g., stability applicability. As prominent example, ladder-like boron hydride sheet, named as 2D ladder polyborane, achieves the desired outcome, enjoying cleanest scenario with an anisotropic tilted Dirac cone, can be fully depicted by minimal...
We demonstrate the emergence of a pronounced thermal transport in recently discovered class magnetic materials-altermagnets. From symmetry arguments and first-principles calculations performed for showcase altermagnet, RuO2, we uncover that crystal Nernst Hall effects this material are very large strongly anisotropic with respect to Neel vector. find originate from three sources Berry's curvature momentum space: Weyl fermions due crossings between well-separated bands, strong spin-flip...
Two-dimensional (2D) topological insulators (TIs) have attracted tremendous research interest from both theoretical and experimental fields in recent years. However, it is much less investigated realizing node line (NL) semimetals 2D materials.Combining first-principles calculations $k \cdot p$ model, we find that NL phases emerge p-CS$_2$ p-SiS$_2$, as well other pentagonal IVX$_2$ films, i.e. p-IVX$_2$ (IV= C, Si, Ge, Sn, Pb; X=S, Se, Te) the absence of spin-orbital coupling (SOC). The NLs...
We predict a stable new 2D large gap topological insulator in the porous allotrope of bismuth monolayer, <italic>i.e.</italic> bismuthylene. Its properties can be reserved under strains and electric fields.
The bottleneck of current studies on topological insulators is to identify better materials that can be fabricated into devices more feasibly. To search for novel materials, we developed a high-throughput framework utilized screen candidates with known crystal structures and further showcase properties based automated construction Wannier functions. We have applied our methods ternary compounds Bi, Sb, nitrides as representative sample. are characterized by the surface states, verified...
Abstract A trend in recent research is to push the study of topological phases spin‐splitting antiferromagnetic (SSAFM) systems, which has become a forefront spintronics. Here, realization SSAFM real Chern insulator (RCI) monolayer transition metal nitride A(BN) 2 (A = Mg, Ca, Zn and B Co) revealed. Taking Mg(CoN) (ML‐MgCoN) as an example. In absence spin‐orbit coupling, ML‐MgCoN altermagnetic (AM) material, each spin channel material possesses nontrivial number protected by symmetry. Unlike...
Based on density-functional theory using the generalized gradient approximation plus Hubbard U scheme, we studied structural, electronic, and magnetic properties of graphene doped with W atoms. Our results show that introduces a spin polarized state local moment 2.00 μB, which can be well understood hybridization model. When two defects are introduced into graphene, ferromagnetic (FM), antiferromagnetic, paramagnetic states obtained, depending crystal directions relative positions between...
Xenes, two-dimensional (2D) monolayers composed of a single element, with graphene as typical representative, have attracted widespread attention. Most the previous $X$ from group-IIIA to group-VIA elements, bonding characteristics covalent bonds. In this paper, we unveil pivotal role halogen bond, which is distinctive type interaction strength between that bond and van der Waals interaction, in 2D group-VIIA monolayers. Combing ingenious non-edge-to-edge tiling theory state-of-the-art ab...
Despite the rapid progress in study of planar Hall effect (PHE) recent years, all previous works only showed that PHE is connected to local geometric quantities, such as Berry curvature. Here, for first time, we point out magnetic Weyl semimetals directly related a global quantity, namely, Chern number point. This leads remarkable consequence observation predicted here robust against many system details, including Fermi energy. The main difference between non-magnetic and points latter...
Based on first-principles calculations and symmetry analysis, we report that the three-dimensional nodal-line (NL) semimetal phases can be realized in lead dioxide family ( $\ensuremath{\alpha}$ -${\mathrm{PbO}}_{2}$ $\ensuremath{\beta}$ -${\mathrm{PbO}}_{2}$) its derivatives. The features two orthogonal nodal rings around Fermi level, protected by mirror reflection symmetry. effective model is developed related parameters are given fitting with HSE06 band structures. NLs mainly come from...