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 Fermi surface mapping taken in the stretched sample. The upper panels show the raw data and the lower panels show the second derivative images. The derivation is calculated in the energy direction. (b) The same as panel (a) but taken in the pressed sample. The PZT voltage was carefully adjusted to keep a constant strain or tension during the temperature dependent experiments.