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DY: Fachverband Dynamik und Statistische Physik

DY 43: Poster: Statistical Physics

DY 43.2: Poster

Mittwoch, 11. März 2026, 15:00–18:00, P5

Classical fractionally charged quasiparticles in kagome lattices and at interfaces — •Jannis Waldmann, Malte Grunert, and Erich Runge — Theoretical Physics I, Institute of Physics, Technische Universität Ilmenau, 98693 Ilmenau, Germany

Interacting systems of charged particles can show fractionally charged excitations, as is well known from the Fractional Quantum Hall Effect of electrons in a magnetic field. Fractionally charged excitations have also been predicted in the absence of magnetic fields for certain lattices with geometric frustrations, e.g., for quantum mechanical models of spinless fermions on the criss-crossed checkerboard lattice [1,2]. Here, we present results on the transport properties of classical particles with nearest-neighbor repulsion on a kagome lattice including Andreev-like reflection at interfaces between frustrated and 'normal', i.e., non-frustrated matter. This involves a coupling between kagome lattice and an infinite particle reservoir via transport channels. Through kinetic Monte Carlo simulations, we study the transition from classical hopping at high temperatures and electric fields to transport dominated by half-charged quasiparticles at low temperatures and special filling factors.

[1] P. Fulde et al., Ann. Phys. 514, 892-900 (2002)

[2] F. Pollmann et al., J. Magn. Magn. Mat. 310, 966-968 (2007)

Keywords: Fractional charges; Lattice dynamics; Reflection; Kinetic Monte Carlo