Domain Dependent Fermi Arcs Observed in a Striped Phase Dichalcogenide
Domain Dependent Fermi Arcs Observed in a Striped Phase Dichalcogenide
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DOI：
10.1002/qute.202200029
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发表时间：
2021-12
影响因子：
4.4
通讯作者：
T. Mizokawa;A. Barinov;V. Kandyba;A. Giampietri;Ryoya Matsumoto;Y. Okamoto;K. Takubo;K. Miyamoto;T. Okuda;S. Pyon;H. Ishii;K. Kudo;M. Nohara;N. Saini
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文献类型：
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作者：
T. Mizokawa;A. Barinov;V. Kandyba;A. Giampietri;Ryoya Matsumoto;Y. Okamoto;K. Takubo;K. Miyamoto;T. Okuda;S. Pyon;H. Ishii;K. Kudo;M. Nohara;N. Saini
经历对称破缺相变的固体通常表现出具有不同大小和形态形状的低对称相域。通常，这些区域的形状与对称性破缺的性质没有直接关系。本文展示了一个具有三角形晶格的层状二硫化物的有趣例子，其中电子电荷/轨道的对称性破缺伴随着条纹域和具有特殊自旋织构的奇异表面态的形成。利用角度分辨光发射光谱显微镜，在≈280 K的一阶相变中观察到层状IrTe2的介观条纹结构域。当进一步冷却至47k时，条纹畴演化为具有三个方向电子各向异性的三结畴。每个区域都有准一维表面带，形成碎片状的费米表面（费米弧），具有自旋分辨光谱学显示的特殊自旋极化。费米弧对应于在表面截断的二维体电子带的边缘状态，表明对称破缺、表面电子结构和自旋状态之间存在有趣的相互作用。
Solids undergoing symmetry breaking phase transitions commonly exhibit domains of low symmetry phases with various sizes and morphological shapes. Usually, the shapes of these domains are not directly related to the nature of symmetry breaking. Here, an interesting example of a layered dichalcogenide with a triangular lattice is shown, in which symmetry breaking of electronic charge/orbital is accompanied by formation of striped domains and exotic surface states with peculiar spin textures. Using angle‐resolved photoemission spectromicroscopy, the mesoscopic striped domains in the layered IrTe2 are observed across the first order phase transition at ≈280 K. Under further cooling down to 47 K, the striped domains evolve into trijunction domains with electronic anisotropy in three directions. Each domain harbors quasi 1D surface bands forming fragmented Fermi surfaces (Fermi arcs) with peculiar spin polarization revealed by spin‐resolved photoemission spectroscopy. The Fermi arc corresponds to an edge state of the 2D bulk electronic bands truncated at the surface, indicating an interesting interplay between the symmetry breaking, surface electronic structure, and the spin state.