Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 1: Correlated Electrons: Low-dimensional Systems - Models 1

TT 1.2: Vortrag

Montag, 26. März 2012, 09:45–10:00, H 0104

Low-energy local spectral weights of the one-dimensional Hubbard chain — Stefan Söffing¹, Imke Schneider², and •Sebastian Eggert¹ — ¹TU Kaiserslautern and Research Center OPTIMAS — ²TU Dresden

The Hubbard model in one dimension is a proto-typical model for a quantum wire with separate spin and charge excitations. We now examine the local spectral weights along a finite wire with the numerical Density Matrix Renormalization group in order to find signatures of strongly correlated excitations in the low-energy tunneling density of states. The resulting level structureis remarkably rich in space and energy. Comparing with the predictions from bosonization, we observe strong corrections from higher order operators and boundary effects.