Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 6: Postersession Correlated Electrons: (General) Theory, Low-Dimensional Systems, Kondo Physics, Heavy Fermions, Quantum-Critical Phenomena

TT 6.4: Poster

Montag, 23. März 2009, 13:00–16:45, P1A

Charge transport in classical geometrically frustrated systems — •David Leipold and Erich Runge — TU-Ilmenau, Institut für Physik, D-98693 Ilmenau

The quantum mechanics of geometrically frustrated systems has been studied intensively in recent years [1,2]. Here, we study classical charge transport on the criss-crossed checkerboard lattice, which is the two-dimensional counterpart of the pyrochlore lattice. We present results obtained by Monte Carlo simulations in a wide range of particle densities, applied voltages and temperatures. Furthermore, we discuss analytical models which reproduce the simulated behavior in various limits. Our simulations confirm the existence of a number of structures, which are classical analogues of quantum mechanical quasi-particles. These were predicted earlier [3] to carry fractional charge. Due to their high mobility, they contribute substantially to charge transport.

[1] E. Runge and P. Fulde, Phys. Rev. B 70, 245113 (2004)

[2] F. Pollmann, P. Fulde, E. Runge, Phys. Rev. B 73, 125121 (2006)

[3] F. Pollmann, J.J. Betouras, E. Runge, Phys. Rev. B 73, 174417 (2006)