$1T$ - TiSe $_2$多体重整化反应的光谱指纹
Spectroscopic fingerprints of many-body renormalizations in$1T$-TiSe$_2$
摘要：
利用高分辨角分辨光电子能谱（ARPES）研究了$1T$ -TiSe $_2$中单粒子激发的多体重整化. ARPES数据的能量分布曲线揭示了固有的峰-谷-峰特征，而由数据的动量分布曲线导出的电子色散首次突出了多个扭结结构。这些是电子自由度和系统中某些玻色子模式之间耦合的规范签名。我们证明了这一点，使用模型计算的单粒子谱函数在存在的电子玻色子耦合。从我们的ARPES数据的自能分析，我们辨别出一些涉及的玻色子模式，这是$\sim$ 15和26 meV的临界能量尺度。基于这些能量和我们的拉曼散射数据的特征能量尺度之间的比较，我们确定这些玻色子模式的拉曼主动呼吸（${\text{A}}_\text{1g}$）和剪切（${\text{E}}_\text{g}$）模式，分别。由于电子-声子耦合引起的能带重整化的直接观察增加了电子-声子相互作用对基于$1T$ -TiSe $_2$的化合物中的集体量子态如电荷密度波（CDW）和超导性起中心作用的可能性。
英文摘要：
We have employed high resolution angle resolved photoemission spectroscopy (ARPES) measurements to investigate many-body renormalizations of the single-particle excitations in $1T$-TiSe$_2$. The energy distribution curves of the ARPES data reveal intrinsic peak-dip-hump feature, while the electronic dispersion derived from the momentum distribution curves of the data highlights, for the first time, multiple kink structures. These are canonical signatures of a coupling between the electronic degrees of freedom and some Bosonic mode in the system. We demonstrate this using a model calculation of the single-particle spectral function at the presence of an electron-Boson coupling. From the self-energy analysis of our ARPES data, we discern some of the critical energy scales of the involved Bosonic mode, which are $\sim$15 and 26 meV. Based on a comparison between these energies and the characteristic energy scales of our Raman scattering data, we identify these Bosonic modes as Raman active breathing (${\text{A}}_\text{1g}$) and shear (${\text{E}}_\text{g}$) modes, respectively. Direct observation of the band-renormalization due to electron-phonon coupling increases the possibility that electron-phonon interactions are central to the collective quantum states such as charge density wave (CDW) and superconductivity in the compounds based on $1T$-TiSe$_2$.
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