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Instruments / Technical Area	Publication Details	Published
I05-ARPES	Measurement of the bulk and surface bands in Dirac line-node semimetal ZrSiS Guang-Hao Hong , Cheng-Wei Wang , Juan Jiang , Cheng Chen , Sheng-Tao Cui , Hai-Feng Yang , Ai-Ji Liang , Shuai Liu , Yang-Yang Lv , Jian Zhou , Yan-Bin Chen , Shu-Hua Yao , Ming-Hui Lu , Yan-Feng Chen , Mei-Xiao Wang , Le-Xian Yang , Zhong-Kai Liu , Yu-Lin Chen Chinese Physics B 27 DOI: 10.1088/1674-1056/27/1/017105 Diamond Proposal Number(s): [16846] Show Abstract ▼ Abstract: Dirac semimetals are materials in which the conduction and the valence bands have robust crossing points protected by topology or symmetry. Recently, a new type of Dirac semimetals, so called the Dirac line-node semimetals (DLNSs), have attracted a lot of attention, as they host robust Dirac points along the one-dimensional (1D) lines in the Brillouin zone (BZ). In this work, using angle-resolved photoemission spectroscopy (ARPES) and first-principles calculations, we systematically investigated the electronic structures of non-symmorphic ZrSiS crystal where we clearly distinguished the surface states from the bulk states. The photon-energy-dependent measurements further prove the existence of Dirac line node along the X–R direction. Remarkably, by in situ surface potassium doping, we clearly observed the different evolutions of the bulk and surface electronic states while proving the robustness of the Dirac line node. Our studies not only reveal the complete electronic structures of ZrSiS, but also demonstrate the method manipulating the electronic structure of the compound.	Jan 2018
I05-ARPES	Topological origin of the type-II Dirac fermions in PtSe2 Yiwei Li , Yunyouyou Xia , Sandy Adhitia Ekahana , Nitesh Kumar , Juan Jiang , Lexian Yang , Cheng Chen , Chaoxing Liu , Binghai Yan , Claudia Felser , Gang Li , Zhongkai Liu , Yulin Chen Physical Review Materials 1 DOI: 10.1103/PhysRevMaterials.1.074202 Diamond Proposal Number(s): [15364] Show Abstract ▼ Abstract: Group VIII transition-metal dichalcogenides have recently been proposed to host type-II Dirac fermions. They are Lorentz-violating quasiparticles marked by a strongly tilted conic dispersion along a certain momentum direction and therefore have no analogs in the standard model. Using high-resolution angle-resolved photoemission spectroscopy, we systematically studied the electronic structure of PtSe2 in the full three-dimensional Brillouin zone. As predicted, a pair of type-II Dirac crossings is experimentally confirmed along the kz axis. Interestingly, we observed conic surface states around time-reversal-invariant momenta ¯¯¯ Γ and ¯¯¯¯ M points. The signatures of nontrivial topology are confirmed by the first-principles calculation, which shows an intricate parity inversion of bulk states. Our discoveries not only contribute to a better understanding of topological band structure in PtSe2 but also help further explore the exotic properties, as well as potential application, of group VIII transition-metal dichalcogenides.	Dec 2017
I05-ARPES	Lifshitz transitions induced by temperature and surface doping in type-II weyl semimetal candidate Td-WTe2 Qihang Zhang , Zhongkai Liu , Yan Sun , Haifeng Yang , Juan Jiang , Sung-Kwan Mo , Zahid Hussain , Xiaofeng Qian , Liang Fu , Shuhua Yao , Minghui Lu , Claudia Felser , Binghai Yan , Yulin Chen , Lexian Yang Physica Status Solidi (rrl) - Rapid Research Letters 83 DOI: 10.1002/pssr.201700209 Diamond Proposal Number(s): [16846] Show Abstract ▼ Abstract: Using high resolution angle-resolved photoemission spectroscopy, we systematically investigate the electronic structure of Td-WTe2, which has attracted substantial research attention due to its diverse and fascinating properties, especially the predicted type-II topological Weyl semimetal (TWS) phase. The observed significant lattice contraction and the fact that our ARPES measurements are well reproduced by our ab initio calculations under reduced lattice constants support the theoretical prediction of a type-II TWS phase in Td-WTe2 at temperatures below 10 K. We also investigate the evolution of the electronic structure of Td-WTe2 and realize two-stage Lifshitz transitions induced by temperature regulation and surface modification, respectively. Our results not only shed light on the understanding of the electronic structure of Td-WTe2, but also provide a promising method to manipulate the electronic structures and physical properties of the type-II TWS Td-XTe2.	Oct 2017

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