论文标题
可切换抗fiferromagnet cumnas的实验电子结构
Experimental electronic structure of the electrically switchable antiferromagnet CuMnAs
论文作者
论文摘要
四方Cumnas是一种室温抗铁磁铁，具有可重新定向的néel载体和狄拉克半候选者。据报道，使用角度分辨光发射光谱（ARPES）的单晶薄膜的电子结构的直接测量，包括费米表面（FS）和能量波形向量分散体。在校正了$ \ 390 $ MEV（孔掺杂）的化学势偏移之后，FS有很好的一致性，频带的轨道特性以及实验和密度函数理论计算之间的费米速度。另外，在低能电子衍射（LEED）和ARPE中发现了2x1表面重建。这项工作强调了控制四方Cumnas中的化学潜力的需求，以便能够用可调质量探索和开发Dirac Fermions，这预计在当前样品中将高于化学势。
Tetragonal CuMnAs is a room temperature antiferromagnet with an electrically reorientable Néel vector and a Dirac semimetal candidate. Direct measurements of the electronic structure of single-crystalline thin films of tetragonal CuMnAs using angle-resolved photoemission spectroscopy (ARPES) are reported, including Fermi surfaces (FS) and energy-wavevector dispersions. After correcting for a chemical potential shift of $\approx-390$ meV (hole doping), there is excellent agreement of FS, orbital character of bands, and Fermi velocities between the experiment and density functional theory calculations. Additionally, 2x1 surface reconstructions are found in the low energy electron diffraction (LEED) and ARPES. This work underscores the need to control the chemical potential in tetragonal CuMnAs to enable the exploration and exploitation of the Dirac fermions with tunable masses, which are predicted to be above the chemical potential in the present samples.
