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