Realization of unpinned two-dimensional dirac states in antimony atomic layers
Qiangsheng Lu,Jacob Cook,Xiaoqian Zhang,K.-Y. Chen,M. Snyder,Duy Tung Nguyen,P. V. Sreenivasa Reddy,Bingchao Qin,Shaoping Zhan,Li-Dong Zhao,Paweł Kowalczyk,Simon A. Brown,Tai-Chang Chiang,Shengyuan A. Yang,Tay-Rong Chang,Guang Bian +15 more
TLDR
In this article , 2D Dirac states in antimony atomic layers with a phosphorene structure were observed and shown to be isotropic due to the constraints of crystal symmetries.Abstract:
Two-dimensional (2D) Dirac states with linear dispersion have been observed in graphene and on the surface of topological insulators. 2D Dirac states discovered so far are exclusively pinned at high-symmetry points of the Brillouin zone, for example, surface Dirac states at [Formula: see text] in topological insulators Bi2Se(Te)3 and Dirac cones at K and [Formula: see text] points in graphene. The low-energy dispersion of those Dirac states are isotropic due to the constraints of crystal symmetries. In this work, we report the observation of novel 2D Dirac states in antimony atomic layers with phosphorene structure. The Dirac states in the antimony films are located at generic momentum points. This unpinned nature enables versatile ways such as lattice strains to control the locations of the Dirac points in momentum space. In addition, dispersions around the unpinned Dirac points are highly anisotropic due to the reduced symmetry of generic momentum points. The exotic properties of unpinned Dirac states make antimony atomic layers a new type of 2D Dirac semimetals that are distinct from graphene. read more
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InBi: A Ferroelastic Monolayer with Strain Tunable Spin-Orbit Dirac Points and Carrier Self-Doping Effect.
TL;DR: In this article , the authors theoretically demonstrate the InBi monolayer as a 2D Dirac material whose exotic Dirac Fermionic states cannot be gapped out by spin-orbit coupling (SOC).
Observation of 2D Weyl Fermion States in Epitaxial Bismuthene
Qiangsheng Lu,P. V. Sreenivasa Reddy,Hoyeon Jeon,Alessandro R. Mazza,Matthew Brahlek,Weikang Wu,Shengyuan A. Yang,Jacob Cook,Clayton D. Conner,Xiaoqian Zhang,Amarnath Chakraborty,Yu Yao,Hung Ju Tien,Chun-Han Tseng,Po-Yuan Yang,Shang-Wei Lien,Hsin Lin,Tai-Chang Chiang,Giovanni Vignale,An-Ping Li,Tay-Rong Chang,Robert G. Moore,Guang Bian +22 more
TL;DR: In this article , a 2D Weyl semimetal in monolayer-thick epitaxial bismuthene grown on SnS(Se) substrate is presented.
Journal ArticleDOI
Manipulating Dirac States in BaNiS2 by Surface Charge Doping.
Jiuxiang Zhang,Thibault Sohier,Michele Casula,Zhesheng Chen,J. Caillaux,E. Papalazarou,Luca Perfetti,Luca Petaccia,Azzedine Bendounan,Amina Taleb-Ibrahimi,D. Santos-Cottin,Yannick Klein,Andrea Gauzzi,Marino Marsi +13 more
TL;DR: In this paper , the authors demonstrate the possibility of moving the Dirac bands along the Γ-M symmetry line in reciprocal space by varying the concentration of K atoms adsorbed onto the surface of cleaved BaNiS2 single crystals.
Journal ArticleDOI
Planar MN4 (M = Zn, Cd) Monolayers: 2D Anisotropic Dirac Semimetals of Ultrahigh Fermi Velocities
Rongwu Liu,Xiao-Li Lv,Fengyu Li +2 more
TL;DR: In this paper , two planar 2D Dirac transition metal nitrides are reported, namely, MN4 (M = Zn, Cd) monolayers, which can be regarded as tiled by hexagons and pentagons, with tetracoordinated metal and tricoordinated nitrogen as vertices.
Journal ArticleDOI
Band Structure Evolution during Reversible Interconversion between Dirac and Standard Fermions in Organic Charge-Transfer Salts
TL;DR: In this article , the authors observed the interconversion process of Dirac fermions and SFs using organic charge-transfer (CT) salts, where the constituents (the donor D and acceptor A species) are particularly close to each other in energy, leading to the temperature and D-A-combination-sensitive CT interactions in the solid states.
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