2014/06/30 by Ajit C. Balram, Ursula Wurstbauer, U. Wurstbauer +4
Physics and Astronomy · #Composite fermion #Condensed matter physics #Fermion #Filling factor #Fractional quantum Hall effect #Landau quantization #Magnetic field #Physics #Physics of Superconductivity and Magnetism #Quantum #Quantum Hall effect #Quantum and electron transport phenomena #Quantum mechanics #Quantum spin Hall effect #Quasiparticle #Scattering #Skyrmion #Spin (aerodynamics) #Topological Materials and Phenomena #Topological quantum computer #Topological quantum number #Zeeman effect #Zeeman energy #cond-mat.str-el
paper · pdf · doi:10.1038/ncomms9981
published as Nature Communications 6, Article number: 8981 (2015) · 9 pages, 8 figures
openalex publication_date 2015/11/26 · arxiv created 2015/11/27 · arxiv updated 2015/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
The fractional quantum Hall effect has inspired searches for exotic emergent topological particles, such as fractionally charged excitations, composite fermions, abelian and nonabelian anyons and Majorana fermions. Fractionally charged skyrmions, which support both topological charge and topological vortex-like spin structure, have also been predicted to occur in the vicinity of 1/3 filling of the lowest Landau level. The fractional skyrmions, however, are anticipated to be exceedingly fragile, suppressed by very small Zeeman energies. Here we show that, slightly away from 1/3 filling, the smallest manifestations of the fractional skyrmion exist in the excitation spectrum for a broad range of Zeeman energies, and appear in resonant inelastic light scattering experiments as well-defined resonances slightly below the long wavelength spin wave mode. The spectroscopy of these exotic bound states serves as a sensitive tool for investigating the residual interaction between composite fermions, responsible for delicate new fractional quantum Hall states in this filling factor region.