Single atomic layer allotrope of bismuth with rectangular symmetry
Single atomic layer allotrope of bismuth with rectangular symmetry
复制标题
DOI：
10.1103/physrevb.96.205434
复制
发表时间：
2017-11
影响因子：
3.7
通讯作者：
P. Kowalczyk;O. Mahapatra;Maxime Le Ster;S. Brown;G. Bian;Xiaoxiong Wang;T. Chiang
中科院分区：
文献类型：
--
作者：
P. Kowalczyk;O. Mahapatra;Maxime Le Ster;S. Brown;G. Bian;Xiaoxiong Wang;T. Chiang
我们报告了二维二维的新同素体的观察，我们的扫描型螺旋体显微镜实验表明，与先前合成的同素异源β和α-biSmuthene相比，该结构显然是不同的。 bismuthene，但由BI原子的裂开单层（α-氨基苯烷含有类似于黑色磷）的单一单层图像和观察到的Moir´e模式表明，新的同素具有显着收缩的表面单元。密度功能理论（DFT）揭示了布里群区域三个不同点的狄拉克锥。
We report the observation of a new allotrope of two dimensional bismuth. Our Scanning Tun-nelling Microscopy experiments show that the structure is clearly different than the previously synthesized allotropes β - and α -bismuthene. It has a rectangular symmetry similar to that of α -bismuthene, but is composed of a puckered single monolayer of Bi atoms ( α -bismuthene is in-trisincally a paired layer material similar to black phosphorous). Atomic resolution images and an observed moir´e pattern show that the new allotrope has a significantly contracted surface unit cell. The electronic structure is dominated by high density of states at the Fermi level as measured using scanning tunneling spectrocopy (STS) and confirmed by calculations based on density functional theory (DFT) which reveal Dirac cones at three different points in the Brillouin zone.