Wigner solids of domain wall skyrmions

Abstract

Detection and characterization of a different type of topological excitations, namely the domain wall (DW) skyrmion, has received increasing attention because the DW is ubiquitous from condensed matter to particle physics and cosmology. Here we present experimental evidence for the DW skyrmion as the ground state stabilized by long-range Coulomb interactions in a quantum Hall ferromagnet. We develop an alternative approach using nonlocal resistance measurements together with a local NMR probe to measure the effect of low-current-induced dynamic nuclear polarization and thus to characterize the DW under equilibrium conditions. The dependence of nuclear spin relaxation in the DW on temperature, filling factor, quasiparticle localization, and effective magnetic fields allows us to interpret this ground state and its possible phase transitions in terms of Wigner solids of the DW skyrmion. These results demonstrate the importance of studying the intrinsic properties of quantum states that has been largely overlooked.

42 pages, 16 figures, 1 table

References in corpus (6)

• Advances in the Physics of Magnetic Skyrmions and Perspective for Technology
• Giant Nonlocality near the Dirac Point in Graphene
• Matryoshka Skyrmions
• NMR linewidth and Skyrmion localization in quantum Hall ferromagnets
• Disorder induced transition into a one-dimensional Wigner glass
• Charge and spin textures of Ising quantum Hall ferromagnet domain walls

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• Creation of domain-wall skyrmions in chiral magnets with Landau-Lifshitz-Gilbert dynamics and demagnetization