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

作者:Yang, TY (Yang, T. Y.)[ 1 ] ; Wan, Q (Wan, Q.)[ 1 ] ; Yan, DY (Yan, D. Y.)[ 2,3,4 ] ; Zhu, Z (Zhu, Z.)[ 5 ] ; Wang, ZW (Wang, Z. W.)[ 6 ] ; Peng, C (Peng, C.)[ 1 ] ; Huang, YB (Huang, Y. B.)[ 7 ] ; Yu, R (Yu, R.)[ 6 ] ; Hu, J (Hu, J.)[ 8 ] ; Mao, ZQ (Mao, Z. Q.)[ 9 ] ; Li, S (Li, Si)[ 10 ] ; Yang, SYA (Yang, Shengyuan A.)[ 10 ] ; Zheng, H (Zheng, Hao)[ 5,11 ] ; Jia, JF (Jia, Jin-Feng)[ 5,11 ] ; Shi, YG (Shi, Y. G.)[ 2,3,4,12 ] ; Xu, N (Xu, N.)[ 1 ]

NATURE MATERIALS

卷: 19 期: 1 页: 27-+

DOI: 10.1038/s41563-019-0494-1

出版年: JAN 2020

文献类型: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 in graphene, 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 fermions due 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 directional massless 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.

关键词

KeyWords Plus:ELECTRONIC BAND-STRUCTURE; MONOLAYER; SUPERCONDUCTIVITY; FERROMAGNETISM; CONDUCTION; DISCOVERY

作者信息

通讯作者地址:

Wuhan University Wuhan Univ, Inst Adv Studies, Wuhan, Peoples R China.

通讯作者地址: Xu, N (通讯作者)

Wuhan Univ, Inst Adv Studies, Wuhan, Peoples R China.

地址:

[ 1 ]‎ Wuhan Univ, Inst Adv Studies, Wuhan, Peoples R China

[ 2 ]‎ Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing, Peoples R China

[ 3 ]‎ Chinese Acad Sci, Inst Phys, Beijing, Peoples R China

[ 4 ]‎ Univ Chinese Acad Sci, Sch Phys Sci, Beijing, Peoples R China

[ 5 ]‎ Shanghai Jiao Tong Univ, Sch Phys & Astron, Key Lab Artificial Struct & Quantum Control, Minist Educ,Shenyang Natl Lab Mat Sci, Shanghai, Peoples R China

[ 6 ]‎ Wuhan Univ, Sch Phys & Technol, Wuhan, Peoples R China

[ 7 ]‎ Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai Synchrotron Radiat Facil, Shanghai, Peoples R China

[ 8 ]‎ Univ Arkansas, Dept Phys, Fayetteville, AR 72701 USA

[ 9 ]‎ Penn State Univ, Dept Phys, 104 Davey Lab, University Pk, PA 16802 USA

[ 10 ]‎ Singapore Univ Technol & Design, Res Lab Quantum Mat, Singapore, Singapore

[ 11 ]‎ Shanghai Jiao Tong Univ, Tsung Dao Lee Inst, Shanghai, Peoples R China

[ 12 ]‎ Songshan Lake Mat Lab, Dongguan, Peoples R China

电子邮件地址:nxu@whu.edu.cn