Department of Physics and Astronomy, Jorgensen Hall, PO Box 880299, University of Nebraska-Lincoln, Lincoln, NE 68588-0299, USA. Present address: Department of Physics, Tohoku University, Aramaki-aza-Aoba, Aoba-ku, Sendai, Japan.
J Phys Condens Matter. 2014 Apr 16;26(15):155501. doi: 10.1088/0953-8984/26/15/155501. Epub 2014 Mar 27.
We report the experimental identification of a symmetry-protected surface state on Mo(1 1 2). The utilization of photon-energy- and polarization-dependent angle-resolved photoemission spectroscopy clearly demonstrates that this true surface state preserves its two-dimensional character despite the fact that it resides within the projection of the bulk bands along the ̅Γ-̅X line of the surface Brillouin zone. This surface state on Mo(1 1 2) exists due to the forbidden hybridization between the bulk and the surface states, each of which possesses different state symmetries within the crystal. The experimental identification of such a surface state possibly opens up pathways towards controlled manipulation between true surface states and the surface resonances (i.e. between two-dimensional and quasi-two-dimensional states) by breaking the symmetry of the crystal surface.
我们报告了在 Mo(112)上实验鉴定出的一种对称保护的表面态。利用光子能量和偏振依赖的角分辨光电子能谱清楚地表明，尽管该表面态位于表面布里渊区的 ̅Γ-̅X 线的体能带投影内，但它仍然保持二维特性。Mo(112)上的这种表面态是由于体态和表面态之间的禁带杂化所致，它们在晶体中的每个状态对称性都不同。这种表面态的实验鉴定可能为通过打破晶体表面的对称性，在真正的表面态和表面共振（即二维和准二维态之间）之间进行控制操作开辟了途径。
