Fig. 2: Fermiology of the amorphous surface state.
From: Establishing coherent momentum-space electronic states in locally ordered materials
a ARPES spectra of crystalline and nanocrystalline Bi2Se3. b Large momentum range ARPES spectrum of amorphous Bi2Se3uncovers duplicate dispersions approximately 1.75 Å−1 from Γ. c The Fermi surface (∇2I of the raw intensity for visibility) demonstrates rotational symmetry of the primary and duplicated dispersion. d Illustration of amorphous dispersion and Brillouin zone-like repetition contingent on a characteristic momentum. e Simulated dispersion along k∥ through Γ showing duplicated structures. f Fermi surface from simulations showing repeated annuli. g Photon energy dependence of the 2nd and 3rd BZ dispersion, obeying kz-independent photoemission (dashed white). h ARPES spectrum at hν = 120 eV with repeated dispersions separated by 1.75 Å−1.
