A5100405912- Perovskite Materials and Applications
- Graphene research and applications
- 2D Materials and Applications
- Quantum and electron transport phenomena
- Conducting polymers and applications
- Boron and Carbon Nanomaterials Research
- Topological Materials and Phenomena
- Quantum Dots Synthesis And Properties
- MXene and MAX Phase Materials
- Advanced Fiber Laser Technologies
- Laser-Matter Interactions and Applications
- Molecular Junctions and Nanostructures
- Spectroscopy and Quantum Chemical Studies
- Quantum many-body systems
- Terahertz technology and applications
- Quantum Information and Cryptography
- Advanced Photocatalysis Techniques
- Strong Light-Matter Interactions
- Catalytic Processes in Materials Science
- Electronic and Structural Properties of Oxides
- Photonic and Optical Devices
- Organic and Molecular Conductors Research
- Particle physics theoretical and experimental studies
- Copper-based nanomaterials and applications
- Topic Modeling
Chinese Academy of Sciences
2015-2025
National Center for Nanoscience and Technology
2024-2025
Max Planck Institute of Quantum Optics
2025
Sichuan University
2025
Wuhan University of Technology
2024-2025
Center for NanoScience
2025
Jiangsu Vocational College of Medicine
2024
Universität Hamburg
2020-2024
Max Planck Institute for the Structure and Dynamics of Matter
2020-2024
Center for Free-Electron Laser Science
2020-2024
Honeycomb structures of group IV elements can host massless Dirac fermions with non-trivial Berry phases. Their potential for electronic applications has attracted great interest and spurred a broad search new materials especially in monolayer structures. We present detailed investigation the \beta 12 boron sheet, which is borophene structure that form spontaneously on Ag(111) surface. Our tight-binding analysis revealed lattice 12-sheet could be decomposed into two triangular sublattices...
The search for metallic boron allotropes has attracted great attention in the past decades and recent theoretical works predict existence of metallicity monolayer boron. Here, we synthesize \b{eta}12-sheet on a Ag(111) surface confirm presence boron-derived bands using angle-resolved photoemission spectroscopy. Fermi is composed one electron pocket at S point pair hole pockets near X point, which supported by first-principles calculations. allotrope \b{eta}12 sheet opens way to novel physics...
Nonlinear optical response from a van der Waals interface is modulated and enhanced in twistable boron nitride homostructures.
Strain serves as a powerful freedom to effectively, reversibly, and continuously engineer the physical chemical properties of two-dimensional (2D) materials, such bandgap, phase diagram, reaction activity. Although there is high demand for full characterization strain vector at local points, it still very challenging measure amplitude its direction. Here, we report novel approach monitor in 2D molybdenum diselenide (MoSe2) by polarization-dependent optical second-harmonic generation (SHG)....
Van der Waals-coupled two-dimensional (2D) heterostructures have attracted great attention recently due to their high potential in the next-generation photodetectors and solar cells. The understanding of charge-transfer process between adjacent atomic layers is key design optimal devices as it directly determines fundamental response speed photon-electron conversion efficiency. However, general belief theoretical studies shown that charge transfer behavior depends sensitively on interlayer...
Two reproducible new phases of 2D boron sheets have been found on Ag(1 1 1). One them shares the identical atomic structure previously reported S1 phase (β12 sheet) but has a different rotational relationship with substrate, and thus exhibits very features in scanning tunneling microscopy (STM) images. The other hexagonal symmetry is proposed to be long-expected α-sheet. Both these two are confirmed metallic by spectroscopy.
Abstract 2D anisotropic Dirac cones are observed in χ 3 borophene, a monolayer boron sheet, using high‐resolution angle‐resolved photoemission spectroscopy. The centered at the X and X′ points. data also reveal that hybridization between borophene Ag(111) is very weak, which explains preservation of cones. As has been predicated to be superconductor, results may stimulate further research interest novel physics such as interplay Cooper pairs massless fermions.
Planar borophene, the truly 2D monolayer boron, has been independently successfully grown on Ag(1 1 1) by two groups (2016 Nat. Chem. 8 563 and 2015 Science 350 1513), which received widespreading attentions. The superconducting property not unambiguously observed, is unexpected because light element boron should have strong electron–phonon coupling. To resolve this puzzle, we show that transition temperature Tc of β12 borophene effectively suppressed substrate-induced tensile strain...
Light‐induced interlayer ultrafast charge transfer in 2D heterostructures provides a new platform for optoelectronic and photovoltaic applications. The separation process is generally hypothesized to be dependent on the stackings interactions, however, quantitative characteristic detailed mechanism remain elusive. Here, systematical study model MoS 2 /WS bilayer system with variable stacking configurations by time‐dependent density functional theory methods demonstrated. results show that...
Abstract An efficient and state‐of‐the‐art real‐time time‐dependent density functional theory (rt‐TDDFT) method is presented, as implemented in the ab initio package (TDAP), which aims at performing accurate simulations of interaction between laser fields solid‐state materials. The combination length‐gauge velocity‐gauge electromagnetic field has extended diversity materials under consideration, ranging from low dimensional systems to periodic solids. Meanwhile, by employing a local basis...
The past decade has witnessed numerous discoveries of two-dimensional (2D) semimetals and insulators, whereas 2D metals are rarely identified. Borophene, a monolayer boron sheet, recently emerged as perfect metal with unique structure electronic properties. Here we study collective excitations in borophene, which exhibit two major plasmon modes low damping rates extending from infrared to ultraviolet regime. anisotropic 1D originates tilted Dirac cones analogous that heavily doped...
Nanoscale charge control is a key enabling technology in plasmonics, electronic band structure engineering, and the topology of two-dimensional materials. By exploiting large electron affinity α-RuCl3, we are able to visualize quantify massive transfer at graphene/α-RuCl3 interfaces through generation charge-transfer plasmon polaritons (CPPs). We performed nanoimaging experiments on both ambient cryogenic temperatures discovered robust plasmonic features otherwise ungated undoped structures....
In this paper, we focus on the dynamic spectrum access of two infrastructure-based cognitive radio networks, primary network and secondary network, which are collocated with each other. To improve performance propose a cooperative communication-aware leasing framework, in which, leverages users as relays, decides optimal strategy relay selection price for leasing. Based network's strategy, determines length time it purchases from network. Finally, allocates total among its end users. The...
In this paper we theoretically investigate the photonic spin Hall effect (SHE) of a Gaussian beam reflected from interface between air and topological insulators (TIs). The SHE is attributed to spin-orbit coupling manifests itself as in-plane transverse spin-dependent splitting. We reveal that in TIs can be routed by adjusting axion angle variations. find that, unlike splitting, one sensitive angle. It shown polarization structure magneto-optical Kerr significantly altered due splitting SHE....
Bilayer silicene (BLS) is a class of material that possibly holds both topological and superconducting properties; however, its structure not fully understood. By scanning stacking modes lattice constants using first principles calculations, several meta-stable configurations are identified, including slightly faulted-AA packing structure, named slide-2AA. Different from the metallic properties conventional AA AB forms, band slide-2AA bilayer presents sizeable indirect energy gap ∼1.16 eV. A...
We report the observation of current-induced spin polarization, Rashba-Edelstein effect (REE), and its Onsager reciprocal phenomenon, galvanic (SGE), in a few-layer graphene/2H-TaS2 heterostructure at room temperature. Spin-sensitive electrical measurements unveil full spin-polarization reversal by an applied gate voltage. The observed gate-tunable charge-to-spin conversion is explained ideal work function mismatch between 2H-TaS2 graphene, which allows for strong interface-induced...
Since the discovery of high-temperature superconductivity in cuprates, Josephson junction based phase-sensitive experiments are believed and used to provide most convincing evidence for determining pairing symmetry. Regardless different materials geometries used, quantum tunneling involved these is essentially a nanoscale process, thus, actual experimental results extremely sensitive atomic details structures. The situation has led controversial as nature symmetry cuprates: while in-plane...
We explore pump-probe high harmonic generation (HHG) from monolayer hexagonal-Boron-Nitride, where a terahertz pump excites coherent optical phonons that are subsequently probed by an intense infrared pulse drives HHG. find, through state-of-the-art ab-initio calculations, the structure of emission spectrum is attenuated presence phonons, and no longer comprised discrete orders, but rather continuous in plateau region. The HHG yield strongly oscillates as function delay, corresponding to...
The ability to create nanometer-scale lateral p-n junctions is essential for the next generation of two-dimensional (2D) devices. Using charge-transfer heterostructure graphene/α-RuCl3, we realize nanoscale in vicinity graphene nanobubbles. Our multipronged experimental approach incorporates scanning tunneling microscopy (STM) and spectroscopy (STS) scattering-type near-field optical (s-SNOM) simultaneously probe electronic responses nanobubble junctions. STM/STS results reveal that with a...
Two-dimensional (2D) heterostructures composed of transition-metal dichalcogenide atomic layers are the new frontier for novel optoelectronic and photovoltaic device applications. Some key properties that make these materials appealing, yet not well understood, ultrafast hole/electron dynamics, interlayer energy transfer formation hot excitons. Here, we study photoexcited electron/hole dynamics in a representative heterostructure, MoS2/WSe2 interface, which exhibits type II band alignment....