Anomalous spectral weight transfer in the nematic state of iron-selenide superconductor

Cai C¹, Han T T¹, Wang Z G¹, Chen L¹, Wang Y D¹, Xin Z M¹, Ma M W¹, Li Yuan^{1, 2}, Zhang Y^{1, 2, †}

(a) Temperature dependence of the d_yz electron band. The upper and lower panels show the raw data and second derivative images, respectively. The derivation is calculated in the momentum direction. The Fermi crossings (k_Fs) of the d_yz electron band are illustrated using the green arrows. (b) MDCs taken at the Fermi energy (E_F) for the data shown in panel (a). Inset panel shows the temperature dependence of the spectral weight of the d_yz electron band calculated using a standard peak fitting process. (c) and (d) The same as panels (a) and (b), but taken on the d_xz electron band.