论文标题
弹性软模式和电动四极杆响应（ta $ _ {0.952} $ v $ _ {0.048} $）
Elastic Soft Mode and Electric Quadrupole Response in Excitonic Insulator Candidate (Ta$_{0.952}$V$_{0.048}$)$_2$NiSe$_5$: Contribution of Electron-Phonon Interaction
论文作者
论文摘要
我们在（TA $ _ {0.952} $ v $ _ {0.048} $）上进行了超声测量，$ _ 2 $ nise $ _5 $，以调查区域中心对结构和可能的激子过渡的声音声子的贡献。带有不可约表示的横向弹性常数$ c_ {55} $ $ b_ \ mathrm {2g} $在90 \％以上的柔软温度以上的柔软温度高于$ t_ \ mathrm {s} = 280 $ k，表明相应的Ta phonons的软模式。我们基于四极响应的分析表明，如果实现了激发子和价带之间的杂交，则电子 - 光子相互作用除了实现了激发带和价带之间的杂交外，还有助于激子转变。
We performed ultrasonic measurements on (Ta$_{0.952}$V$_{0.048}$)$_2$NiSe$_5$ to investigate the contribution of acoustic phonons at the zone center to structural and possible excitonic transitions. The transverse elastic constant $C_{55}$ with irreducible representation $B_\mathrm{2g}$ exhibits softening over 90\% above a transition temperature of $T_\mathrm{s} = 280$ K, indicating the soft mode of corresponding TA phonons. Our analysis based on the quadrupole response indicates that the electron-phonon interaction contributes to the excitonic transition in addition to the hybridization between the conduction and valence bands if the excitonic transition is realized.
