【摘 要】
：
Nanocontact properties of two-dimensional (2D) materials are closely dependent on their unique nanomechanical systems,such as the number of atomic layers and the supporting substrate.Here,we report a direct observation of toplayer-dependent crystallograph
【机 构】
：
Beijing Key Laboratory of Optoelectronic Functional Materials & Micro-nano Devices,Department of Phy
论文部分内容阅读
Nanocontact properties of two-dimensional (2D) materials are closely dependent on their unique nanomechanical systems,such as the number of atomic layers and the supporting substrate.Here,we report a direct observation of toplayer-dependent crystallographic orientation imaging of 2D materials with the transverse shear microscopy (TSM).Three typical nanomechanical systems,MoS2 on the amorphous SiO2/Si,graphene on the amorphous SiO2/Si,and MoS2 on the crystallized Al2O3,have been investigated in detail.This experimental observation reveals that puckering behaviour mainly occurs on the top layer of 2D materials,which is attributed to its direct contact adhesion with the AFM tip.Furthermore,the result of crystallographic orientation imaging of MoS2/SiO2/Si and MoS2/Al2O3 indicated that the underlying crystalline substrates almost do not contribute to the puckering effect of 2D materials.Our work directly revealed the top layer dependent puckering properties of 2D material,and demonstrate the general applications of TSM in the bilayer 2D systems.
其他文献
Spiral spin liquids are unique classical spin liquids that occur in many frustrated spin systems,but do not comprise a new phase of matter.Owing to extensive classical ground-state degeneracy,the spins in a spiral spin liquid thermally fluctuate cooperati
As high-performance organic semiconductors,π-conjugated polymers have attracted much attention due to their charming advantages including low-cost,solution processability,mechanical flexibility,and tunable optoelectronic properties.During the past several
Simulation of open quantum dynamics for various Hamiltonians and spectral densities are ubiquitous for studying various quantum systems.On a quantum computer,only log2 N qubits are required for the simulation of an N-dimensional quantum system,hence simul
With the rapidly increasing integration density and power density in nanoscale electronic devices,the thermal management concerning heat generation and energy harvesting becornes quite crucial.Since phonon is the major heat carrier in semiconductors,therm
In conventional quantum mechanics,quantum no-deleting and no-cloning theorems indicate that two different and nonorthogonal states cannot be perfectly and deterministically deleted and cloned,re-spectively.Here,we investigate the quantum deleting and clon
氢气具有无毒、能量密度高以及燃烧过程零污染等优点,被誉为是未来代替化石能源的优质新型能源载体.探索高效的、可持续的制氢技术对氢气能源发展至关重要.其中,光电化学水分解电池以太阳能作为驱动力将水分解成氢气和氧气,是解决能源和环境危机的理想途径之一.α-Fe2O3是一种窄带隙(～2.1 eV)半导体,可以吸收约40％的太阳光,同时具有天然丰度高、成本低等优点,是目前备受关注的光阳极材料.然而,由于α-Fe2O3空穴扩散距离短和表面产氧动力学慢等缺点,导致α-Fe2O3的光电分解水效率仍然较低.针对上述问题,目
Alkaline-earth-like (AEL) atoms with two valence electrons and a nonzero nuclear spin can be excited to Rydberg state for quantum computing.Typical AEL ground states possess no hyperfine splitting,but unfortunately a GHz-scale splitting seems necessary fo
The large-scale production of ammonia mainly depends on the Haber-Bosch process,which will lead to the problems of high energy consumption and carbon dioxide emission.Electrochemical nitrogen fixation is considered to be an environmental friendly and sust
Nonlinear heat transfer can be exploited to reveal novel transport phenomena and thus enhance peo-ple\'s ability to manipulate heat flux at will.However,there has not been a mature discipline called nonlinear thermotics like its counterpart in optics or
Based on the random phase approximation calculation in two-orbital honeycomb lattice model,we investigate the pairing symmetry of Ni-based transition-metal trichalcogenides by electron doping access to type-Ⅱ van Hove singularities (vHs).We find that chir