Tailoring of Bandgap and Spin-Orbit Splitting in ZrSe2 with Low Substitution of Ti for Zr

Tuning the bandgap in layered transition metal dichalcogenides（TMDCs） is crucial for their versatile applications in many fields. The ternary formation is a viable method to tune the bandgap as well as other intrinsic properties of TMDCs, because the multi-elemental characteristics provide additional tunability at the atomic level and advantageously alter the physical properties of TMDCs. Herein, ternary Ti_xZr_1-xSe₂ single crystals were synthesized using the chem...     

超热电子的产生与输运背向辐射的测量

报道了在20TWfs激光器上采用电子磁谱仪和光学CCD积分成像相机分别对激光固体靶相互作用在靶背方向产生的超热电子能谱及其光学渡越辐射进行的测量。能谱测量结果显示:超热电子能谱呈双温类麦克斯韦分布,拟合的温度分别为90和280keV,平均温度为185keV,这与已知的温度定标率较好地吻合。光学渡越辐射测量结果显示:光学渡越辐射是由于超热电子输运穿越固体靶所致,而辐射区域呈圆盘状、有发散角、有光强分布。如果考虑超热电子的产生和加热机制,则占主导地位的加热机制是共振吸收对电子的加热。     

对比分析两大新课标探索初高中物理衔接新路径

初高中物理衔接问题是高中物理教学的重要课题,而物理学科核心素养的提出,给这一问题带来了更深刻更高远的视域.从核心素养角度出发,对义务教育物理新课标和普通高中物理新课标进行对比分析,为初高中物理衔接探索更有效的新路径.     

Electronic Instability of Kagome Metal CsV3Sb5 in the 2×2×2 Charge Density Wave State

Recently discovered kagome metals AV₃Sb₅(A = K,Rb,and Cs) provide an ideal platform to study the correlation among nontrivial band topology,unconventional charge density wave(CDW),and superconductivity.The evolution of electronic structures associated with the change of lattice modulations is crucial for understanding of the CDW mechanism,with the combination of angle-resolved photoemission spectroscopy(ARPES)measurements and density functional theory calculations,we invest...