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TT: Fachverband Tiefe Temperaturen

TT 8: Correlated Electrons: Spin Systems and Itinerant Magnets 1

TT 8.11: Vortrag

Montag, 25. Februar 2008, 17:00–17:15, H 0104

Spectral functions of kagome lattice structures with charge degrees of freedom — •Aroon O’Brien, Frank Pollmann, and Peter Fulde — Max Planck Institute for the Physics of Complex Systems, Noethnitzer Str. 38, 01187 Dresden, Germany

Systems in which strong electronic interactions are frustrated can exhibit interesting physical effects. Two particularly well known frustrated lattices are the planar pyrochlore (checkerboard) lattice and the kagome lattice. For a model of spinless fermions on a checkerboard lattice, it has been demonstrated that fractional charges occur at certain filling factors [1]. A thorough study of this model has further shown that these fractional charges are linearly confined [2]. However, whether fractional charges are confined or deconfined at various fillings on the kagome lattice is not yet understood. We address this question through the numerical calculation of various properties of static and dynamic fractional charges at 1/3 and 1/6 filling, for a model of spinless fermions on the kagome lattice.

[1] P. Fulde, K.Penc, and N. Shannon, Annalen der Physik (Leipzig) 11, 892 (2002)

[2] F. Pollmann and P. Fulde, EPL 75, 133 (2006)