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A symmetrically doped double layer electron system with total filling fraction ν = 1/m decouples into two even denominator (ν = 1/2m) composite fermion ‘metals’ when the layer spacing is large. Out-of-phase fluctuations of the statistical gauge fields in this system mediate a singular attractive pairing interaction between composite fermions in different(More)
The reduction of the energy gap due to Landau level mixing, characterized by the dimensionless parameter λ = (e/ǫl0)/h̄ωc, has been calculated by variational Monte Carlo for the fractional quantum Hall effect at filling fractions ν = 1/3 and 1/5 using a modified version of Jain’s composite fermion wave functions. These wave functions exploit the Landau(More)
  • Bonesteel
  • Physical review. B, Condensed matter
  • 1993
Spin-orbit corrections to superexchange are calculated using the method of Moriya [T. Moriya, Phys. Rev. 120 91, (1960)] for two of the insulating parent compounds of the cuprate superconductors: (1) La2−xNdxCuO4 where the CuO6 octahedra forming each Cu-O layer are tilted in staggered fashion about an axis which depends on x and temperature; and (2)(More)
  • Bonesteel
  • Physical review. B, Condensed matter
  • 1993
To leading order in displacement size, the scattering of electrons in a Cu-O plane from O displacements perpendicular to that plane is due to spin-orbit coupling. This scattering is investigated with the following results: (1) As a consequence of timereversal symmetry, spin fluctuations, which can strongly enhance scattering from a spin impurity, do not(More)