Landau level splitting in Cd3As2 under high magnetic fields.
Junzhi Cao,Sihang Liang,Cheng Zhang,Yanwen Liu,Junwei Huang,Zhao Jin,Zhigang Chen,Zhijun Wang,Qisi Wang,Jun Zhao,Shiyan Li,Xi Dai,Jin Zou,Zhengcai Xia,Liang Li,Faxian Xiu +15 more
TLDR
The first transport experiment on Landau level splitting in TDS Cd3As2 single crystals under high magnetic fields is reported, suggesting the removal of spin degeneracy by breaking time reversal symmetry.Abstract:
Three-dimensional topological Dirac semimetals (TDSs) are a new kind of Dirac materials that exhibit linear energy dispersion in the bulk and can be viewed as three-dimensional graphene. It has been proposed that TDSs can be driven to other exotic phases like Weyl semimetals, topological insulators and topological superconductors by breaking certain symmetries. Here we report the first transport experiment on Landau level splitting in TDS Cd3As2 single crystals under high magnetic fields, suggesting the removal of spin degeneracy by breaking time reversal symmetry. The detected Berry phase develops an evident angular dependence and possesses a crossover from non-trivial to trivial state under high magnetic fields, a strong hint for a fierce competition between the orbit-coupled field strength and the field-generated mass term. Our results unveil the important role of symmetry breaking in TDSs and further demonstrate a feasible path to generate a Weyl semimetal phase by breaking time reversal symmetry.read more
Citations
More filters
Journal ArticleDOI
Weyl and Dirac semimetals in three-dimensional solids
TL;DR: Weyl and Dirac semimetals as discussed by the authors are three-dimensional phases of matter with gapless electronic excitations that are protected by topology and symmetry, and they have generated much recent interest.
Journal ArticleDOI
Negative Magnetoresistance in Dirac Semimetal Cd3As2
Hui Li,Hongtao He,Hai-Zhou Lu,Huachen Zhang,Hongchao Liu,Rong Ma,Zhiyong Fan,Shun-Qing Shen,Jiannong Wang +8 more
TL;DR: The observation of NMR in Cd3As2 microribbons in parallel magnetic fields up to 66% at 50 K and visible at room temperatures is reported, demonstrating the chiral anomaly, a long-sought high-energy-physics effect, in solid-state systems.
Journal ArticleDOI
Experimental perspective on three-dimensional topological semimetals
Journal ArticleDOI
Zeeman splitting and dynamical mass generation in Dirac semimetal ZrTe5
Yanwen Liu,Xiang Yuan,Cheng Zhang,Zhao Jin,Awadhesh Narayan,Chen Luo,Zhigang Chen,Lei Yang,Jin Zou,Xing Wu,Stefano Sanvito,Zhengcai Xia,Liang Li,Zhong Wang,Faxian Xiu +14 more
TL;DR: This work reports high-magnetic-field transport measurements of the Dirac semimetal candidate ZrTe5, and interprets the abrupt changes in the magnetoresistance, indicating field-induced phase transitions, which bears resemblance to the dynamical mass generation of nucleons in high-energy physics.
Journal ArticleDOI
A robust and tuneable mid-infrared optical switch enabled by bulk Dirac fermions
Chunhui Zhu,Fengqiu Wang,Yafei Meng,Xiang Yuan,Faxian Xiu,Faxian Xiu,Hongyu Luo,Yazhou Wang,Jianfeng Li,Xinjie Lv,Liang He,Yongbing Xu,Jun-Feng Liu,Chao Zhang,Yi Shi,Rong Zhang,Shining Zhu +16 more
TL;DR: It is shown that bulk Dirac fermions in molecular beam epitaxy grown crystalline Cd3As2, a three-dimensional topological Dirac semimetal, constitutes an exceptional ultrafast optical switching mechanism for the mid-infrared.
References
More filters
Journal ArticleDOI
The rise of graphene
TL;DR: Owing to its unusual electronic spectrum, graphene has led to the emergence of a new paradigm of 'relativistic' condensed-matter physics, where quantum relativistic phenomena can now be mimicked and tested in table-top experiments.
Journal ArticleDOI
The electronic properties of graphene
TL;DR: In this paper, the basic theoretical aspects of graphene, a one-atom-thick allotrope of carbon, with unusual two-dimensional Dirac-like electronic excitations, are discussed.
Journal ArticleDOI
Two-dimensional gas of massless Dirac fermions in graphene
Kostya S. Novoselov,A. K. Geim,Sergey V. Morozov,Da Jiang,Mikhail I. Katsnelson,Irina V. Grigorieva,S. V. Dubonos,A. A. Firsov +7 more
TL;DR: This study reports an experimental study of a condensed-matter system (graphene, a single atomic layer of carbon) in which electron transport is essentially governed by Dirac's (relativistic) equation and reveals a variety of unusual phenomena that are characteristic of two-dimensional Dirac fermions.
Journal ArticleDOI
Experimental observation of the quantum Hall effect and Berry's phase in graphene
TL;DR: In this paper, an experimental investigation of magneto-transport in a high-mobility single layer of Graphene is presented, where an unusual half-integer quantum Hall effect for both electron and hole carriers in graphene is observed.
Journal ArticleDOI
Topological insulators and superconductors
Xiao-Liang Qi,Shou-Cheng Zhang +1 more
TL;DR: Topological superconductors are new states of quantum matter which cannot be adiabatically connected to conventional insulators and semiconductors and are characterized by a full insulating gap in the bulk and gapless edge or surface states which are protected by time reversal symmetry.