Single fermion Green's function in the quantum ordered Fermi-system: Analytic solution

• Published in: Physica. B, Condensed matter Condensed matter, 2012-06, Vol.407 (11), p.1882-1884
• Main Authors: Mukhin, S.I., Galimzyanov, T.R.
• Format: Article
• Language: English
• Subjects: Condensed matter; Correlation; Density of states; Exact solutions; Fermions; Green's functions; Mathematical analysis; Order parameters; Pseudo-gap; Quantum order parameter; Side bands; Single-fermion Green's function
• ISSN: 0921-4526; 1873-2135
• DOI: 10.1016/j.physb.2012.01.054

An exact self-consistent solution for a finite temperature quantum-ordered state of correlated electron system found previously (Mukhin, 2009, 2011) is used to derive the fermionic single-particle Green's function. The quantum order parameter (QOP) found in the form of a periodic (elliptic Jacoby) function of the Matsubara's imaginary time (Mukhin, 2009), plays the role of effective scattering potential seen by electrons. The analytic solution for the Green's function demonstrates the following new features: (1) the pseudo-gap behavior of the single-electron density of states (DOS) near the (shifted) Fermi-level;(2) the side-bands of decreasing intensity away from the Fermi-level; (3) scaling of the quasi-particle energies with the QOP amplitude; (4) fermionic quasi-particles in the QOP state are combined from two confined “odd” and “even” fermions that separately would be unstable. The false-color plot of single-fermion DOS in the limit of a periodic kink-like Matsubara time-dependence of QOP is presented and could be used as prediction for the ARPES experiments. The plot of the DOS transfer between different energies at the “fermi-surface” momentum for a given kink-like QOP is also presented. Some possibly observable consequences of the found finger-prints are discussed.