We identify highly correlated hole pocket on the Fermi surface of colossal thermoelectric material ${\mathrm{K}}_{0.65}{\mathrm{RhO}}_2$, studied using high-resolution angle-resolved photoemission spectroscopy (ARPES) and density-functional theory (DFT) calculations. Most importantly, two kinks at binding energies of 75 and 195 meV have been observed below the Fermi level. While the low-energy kink at 75 meV can be understood as a result of the electron-phonon interaction, the high-energy kink at 195 meV is a discovery of this system, leading to anomalous band renormalization, possibly originated from the bosonic excitations at higher frequencies. We further notice that the high-energy anomaly has important implications on the colossal thermoelectric power of ${\mathrm{K}}_{0.65}{\mathrm{RhO}}_2$.

中文翻译：

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具有巨大热电功率因数的K0.65RhO2中的高能扭结导致谱带异常归一化

我们在巨大的热电材料的费米表面上识别出高度相关的空穴 ${\mathrm{ķ}}_{0.65}{铑}_{\mathrm{2个}}$，使用高分辨率角度分辨光发射光谱（ARPES）和密度泛函理论（DFT）计算进行了研究。最重要的是，在费米能级以下观察到了两个结合能分别为75和195 meV的纽结。虽然可以将75 meV的低能扭结理解为电子-声子相互作用的结果，但在195 meV的高能扭结却是该系统的发现，导致异常的谱带重归一化，可能归因于20更高的频率。我们进一步注意到，高能异常对热电的巨大热电有重要影响。${\mathrm{ķ}}_{0.65}{铑}_{\mathrm{2个}}$。