Large Fermi surface expansion through anisotropic mixing of conduction and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>f</mml:mi></mml:math> electrons in the semimetallic Kondo lattice CeBi

Using angle-resolved photoemission spectroscopy (ARPES) and resonant ARPES, we report evidence of strong anisotropic conduction-felectron mixing (c\text{\ensuremath{-}}fmixing) in CeBi by observing a largely expanded Ce 5dpocket at low temperature, with no change in the Bi 6pbands. The anisotropic Fermi surface (FS) expansion is accompanied by a pronounced spectral weight transfer from the local 4{f}^{0}peak of Ce (corresponding...