IrTe $_2$表面phase diagram的光电发射检测
Examining the surface phase diagram of IrTe$_2$ with photoemission
摘要：
在过渡金属二硫属化物IrTe $_2$中，涉及Ir二聚体的低温电荷有序相变导致不同周期性的条纹相的发生，并且接近简并能量。体敏测量表明，在冷却时，IrTe $_2$经历两个这样的一阶跃迁，分别在$T_{c_1}\sim 280$ ~K和$T_{c_2}\sim 180$ ~K处到$(5\times1\times5)$和$(8\times1\times8)$重构相位。在这里，使用IrTe $_2$的电子结构的表面敏感探针，我们揭示了一级相变在$T_{c_3}=165$ ~K的$(6\times1)$条纹相，以前提出的表面基态。这是通过结合X射线光电子能谱和角度分辨光电子能谱，这使得访问条纹域的演变和一个特定的表面状态，其能量取决于Ir二聚体的长度。通过在一个完整的热循环进行测量，我们还报告了所有这些阶段的完整滞后。
英文摘要：
In the transition metal dichalcogenide IrTe$_2$, low-temperature charge-ordered phase transitions involving Ir dimers lead to the occurrence of stripe phases of different periodicities, and nearly degenerate energies. Bulk-sensitive measurements have shown that, upon cooling, IrTe$_2$ undergoes two such first-order transitions to $(5\times1\times5)$ and $(8\times1\times8)$ reconstructed phases at $T_{c_1}\sim 280$~K and $T_{c_2}\sim 180$~K, respectively. Here, using surface sensitive probes of the electronic structure of IrTe$_2$, we reveal the first-order phase transition at $T_{c_3}=165$~K to the $(6\times1)$ stripes phase, previously proposed to be the surface ground state. This is achieved by combining x-ray photoemission spectroscopy and angle-resolved photoemission spectroscopy, which give access to the evolution of stripe domains and a particular surface state, the energy of which is dependent on the Ir dimer length. By performing measurements over a full thermal cycle, we also report the complete hysteresis of all these phases.
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