2008/08/22 by J. M. P. Carmelo, D. Bozi, Karlo Penc +1 · 1 citation
Chemistry · Physics and Astronomy · #Atom (system on chip) #Chemistry #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Density of states #Electron #Electron localization function #Lattice (music) #Molecular physics #Molecule #Physics #Quantum #Quantum and electron transport phenomena #Quantum many-body systems #Quantum mechanics #Spectral function #Spectral line #Spin (aerodynamics) #Tetracyanoquinodimethane #Tetrathiafulvalene #cond-mat.str-el
paper · pdf · doi:10.1088/0953-8984/20/41/415103
arxiv created 2008/08/22 · openalex publication_date 2008/09/05 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We extend to initial ground states with zero spin density m = 0 the expressions provided by the pseudofermion dynamical theory (PDT) for the finite-energy one- and two-electron spectral-weight distributions of a one-dimensional (1D) correlated metal with on-site particle-particle repulsion. The spectral-function expressions derived in this paper were used in recent successful and detailed theoretical studies of the finite-energy singular features in photoemission of the organic compound tetrathiafulvalene-tetracyanoquinodimethane (TTF-TCNQ) metallic phase. Our studies take into account spectral contributions from types of microscopic processes that do not occur for finite values of the spin density. Expressions for the spectral functions in the vicinity of the singular border lines which also appear in the TTF- TCNQ spectral-weight distribution are derived. In addition, the PDT expressions are generalized for electronic densities in the vicinity of half filling. Further details on the processes involved in the applications to TTF-TCNQ are reported. Our results are useful for the further understanding of the unusual spectral properties observed in low-dimensional organic metals and also provide expressions for the one- and two-atom spectral functions of a correlated quantum system of ultracold fermionic atoms in a 1D optical lattice with on-site two-atom repulsion.