Measurable fractional spin for quantum Hall quasiparticles on the disk – Archive ouverte HAL

Tommaso Comparin 1 Alvin Opler 2 Elia MacalusoAlberto Biella 2 Alexios P. PolychronakosLeonardo Mazza 2

Tommaso Comparin, Alvin Opler, Elia Macaluso, Alberto Biella, Alexios P. Polychronakos, et al.. Measurable fractional spin for quantum Hall quasiparticles on the disk. Phys.Rev.B, 2022, 105 (8), pp.085125. ⟨10.1103/PhysRevB.105.085125⟩. ⟨hal-03496472⟩

We study the spin of the localized quasiparticle excitations of lowest-Landau-level quantum Hall states defined on a disk. The spin that we propose satisfies the spin-statistics relation and can be used to reconstruct the topological geometric phase associated to the exchange of two arbitrarily chosen quasiparticles. Since it is related to the quadrupole moment of the quasiparticle charge distribution, it can be measured in an experiment and could reveal anyonic properties in a way that is complementary to the interferometric schemes employed so far. We first discuss our definition for the quasiholes of the Laughlin state, for which we present a numerical and analytical study of our spin, and we proceed with a discussion of several kinds of quasiholes of the Halperin 221 state. Finally, we discuss the link between our spin and the adiabatic rotation of the quasiparticles around their axis and demonstrate that our spin obeys the spin-statistics relation.

  • 1. Phys-ENS – Laboratoire de Physique de l’ENS Lyon
  • 2. LPTMS – Laboratoire de Physique Théorique et Modèles Statistiques

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