Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 55: Low-Dimensional Systems: 2D – Theory

TT 55.5: Vortrag

Mittwoch, 18. März 2015, 10:30–10:45, H 3010

Non-Fermi-liquid behavior in a 2D transport model with boson affected hopping — •Dai-Ning Cho and Steffen Sykora — Institute for Theoretical Solid State Physics, IFW Dresden, D-01069 Dresden, Germany

Charge transport mediated by excitations in a correlated background medium is a general phenomenon in condensed matter physics. A simplified model of spinless fermions which are dynamically coupled to a system of bosonic degrees of freedom has been introduced by Edwards. In our work we study the half-filled Edwards model in 2D by use of the projective renormalization method (PRM), which transforms the model Hamiltonian to a solvable effective Hamiltonian involving renormalized bosons and fermions. We find significant reduction of the one-particle spectral weight close to the charge density wave (CDW) phase, which is well-known from the 1D case. Inside this non-Fermi-liquid region an unconventional superconducting phase with s± pairing symmetry is also found. Thereby, the pairing is stabilized by strong renormalization of the charge carrier transport. We present results for the renormalized dispersions and one-particle spectral functions.