2015/04/30 by A. T. Hatke, Yang Liu, L. W. Engel +4
Materials Science · Physics and Astronomy · #Atomic physics #Charge (physics) #Condensed matter physics #Dipole #Electron #Graphene research and applications #Physics #Quantum Hall effect #Quantum and electron transport phenomena #Quantum mechanics #Quasiparticle #Topological Materials and Phenomena #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.95.045417
published as Phys. Rev. B 95, 045417 (2017)
arxiv created 2016/03/26 · openalex created_date 2016/06/24 · openalex publication_date 2017/01/20 · arxiv updated 2017/01/25 · openalex updated_date 2026/08/06
We have studied the microwave spectra of a wide quantum well for Landau level fillings, \ensuremathν, just below 1/2, under conditions where the \ensuremathν=1/2 fractional quantum Hall effect (FQHE) is present. One resonance in the spectra exhibits intensity variations with \ensuremathν in striking agreement with that expected for a pinning mode of a Wigner solid of quasiholes of this FQHE state. This resonance is also quite sensitive to asymmetrization of the growth-direction charge distribution in the quantum well by gate bias. Another resonance in the spectra is associated with a different bilayer Wigner solid that also exists at much lower \ensuremathν than the 1/2 FQHE, and that appears to coexist with the 1/2 quasihole solid.