Directional massless Dirac fermions in a layered van der Waals material with one-dimensional long-range order.

作者:Yang, T Y; Wan, Q; Yan, D Y; Zhu, Z; Wang, Z W; Peng, C; Huang, Y B; Yu, R; Hu, J; Mao, Z Q...更多内容

Nature materials

DOI:10.1038/s41563-019-0494-1

出版年: 2019-Oct-07 (Epub 2019 Oct 07)

文献类型:Journal Article

摘要

One or a few layers of van der Waals (vdW) materials are promising for applications in nanoscale electronics. Established properties include high mobility ingraphene, a large direct gap in monolayer MoS2, the quantum spin Hall effect in monolayer WTe2 and so on. These exciting properties arise from electron quantum confinement in the two-dimensional limit. Here, we use angle-resolved photoemission spectroscopy to reveal directional massless Dirac fermionsdue to one-dimensional confinement of carriers in the layered vdW material NbSi0.45Te2. The one-dimensional directional massless Dirac fermions are protected by non-symmorphic symmetry, and emerge from a stripe-like structural modulation with long-range translational symmetry only along the stripe direction as we show using scanning tunnelling microscopy. Our work not only provides a playground for investigating further the properties of directionalmassless Dirac fermions, but also introduces a unique component with one-dimensional long-range order for engineering nano-electronic devices based on heterostructures of vdW materials.

作者信息

地址:Institute for Advanced Studies, Wuhan University, Wuhan, China.
Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China.
School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, China.
Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shenyang National Laboratory for Materials Science, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, China.
School of Physics and Technology, Wuhan University, Wuhan, China.
Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, China.
Department of Physics, University of Arkansas, Fayetteville, AR, USA.
Department of Physics, Pennsylvania State University, University Park, PA, USA.
Research Laboratory for Quantum Materials, Singapore University of Technology and Design, Singapore, Singapore.
Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai, China.
Songshan Lake Materials Laboratory, Dongguan, China.
Institute for Advanced Studies, Wuhan University, Wuhan, China. nxu@whu.edu.cn.

原文PDF链接：

https://www.nature.com/articles/s41563-019-0494-1