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TT: Fachverband Tiefe Temperaturen

TT 62: CE: Low-dimensional Systems - Models 2

TT 62.9: Vortrag

Freitag, 18. März 2011, 12:45–13:00, HSZ 105

Local density of states of a quarter-filled 1D Mott insulator with a boundary — •Dirk Schuricht — Institut für Theorie der Statistischen Physik, RWTH Aachen — JARA-Fundamentals of Future Information Technology

We determine the local density of states (LDOS) of a quarter-filled one-dimensional Mott insulator in the presence of a strong impurity potential, which is modeled by a boundary. To this end we calculate the Green function in the low-energy limit using field theory techniques. The Fourier transform of the LDOS shows signatures of a pinning of the spin density wave at the imprity as well as several dispersing features at frequencies above the charge gap, which can be interpreted as propagating spin and charge degrees of freedom. Finally, we discuss the effect of bound states localized at the impurity.