论文类型：期刊论文
通讯作者：T Qian
合写作者：H Ding,NL Wang,AF Fang,Z Fang,X Dai,G Xu,M Shi,P Richard,JZ Ma,LK Zeng,N Xu,P Zhang,YB Huang,X Shi,ZJ Wang,H Miao
发表刊物：New Journal of Physics
收录刊物：SCI
学科门类：物理学
文献类型：J
卷号：16
期号：12
页面范围：123038
ISSN号：1367-2630
发表时间：2014-12-15
影响因子：3.558
摘要：We have investigated the electronic states of IrTe 2 by using angle-resolved photoemission spectroscopy to elucidate the origin of the structural phase transition. Both the Ir 4f and Te 4d core level spectra exhibit dramatic splitting below the phase transition temperature T s, suggesting that there exist two inequivalent Ir and Te sites with distinctly different electronic states in the distorted phase. The band related to the saddle points at the Fermi level (E F) is strongly reconstructed, which removes the van Hove singularity from E F below T s. The wavevector connecting the adjacent saddle points is consistent with the in-plane superstructure modulation wavevector. These results indicate that the phase transition in IrTe 2 is intimately associated with the saddle points. As the van Hove singularity mainly originates from the Te p x+ p y orbitals, the Te 5p electronic states play a dominant role in the structural phase transition.