Charged pseudospin textures in double-layer quantum Hall systems: Bimerons and meron crystals

Quasiparticle excitations of incompressible quantum Hall states at a total filling factor {ν}=1 in a double-layer system have bimeron pseudospin textures. We studied the charge and pseudospin distributions and the energies of these quasiparticles as a function of layer separation, tunneling amplitude between the layers, and in-plane magnetic field strength by using a supercell microscopic unrestricted Hartree-Fock approach. We find that for typical double-layer system parameters, estimates of quasiparticle properties based wholly or partly on field-theoretic models require substantial quantitative revision. We comment on the nature of the crystal states expected at a finite but small quasiparticle density, and on limitations of the unrestricted Hartree-Fock approach. {} 1996 The American Physical Society.