One-step approach to ARPES from strongly correlated solids: A Mott-Hubbard system

Article

关键词: ANGLE-RESOLVED PHOTOEMISSION;    MEAN-FIELD THEORY;    ELECTRONIC-STRUCTURE;    WANNIER FUNCTIONS;    GREENS-FUNCTION;    SURFACE;    MODEL;    SUPERCONDUCTIVITY;   

DOI  :  10.1103/PhysRevB.94.115119

来源: SCIE

【 摘 要 】

An expression is derived for angle-resolved photocurrent from a semi-infinite correlated system. Within the sudden approximation, the photocurrent is proportional to the spectral function of a one-particle two-time retarded Green's function G of an operator that creates an electron in a special quantum state chi localized at the surface. For a system described by a many-body single-band model, we present an analytical expression that relates the Green's function G with the Green's function of an infinite crystal G(b,k)(omega) in Wannier representation. The role of final states and of the crystal surface is analyzed for a model Green's function of the infinite crystal with a three-peak spectral function typical of a Mott-Hubbard metal. The momentum dependences of both the quasiparticle pole position and the spectral weight of the incoherent band manifest themselves in the shape of the photocurrent energy distribution curve.

【 授权许可】

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