CHARGED PSEUDOSPIN TEXTURES IN DOUBLE-LAYER QUANTUM HALL SYSTEMS - BIMERONS AND MERON CRYSTALS

Quasiparticle excitations of incompressible quantum nail stales at a t otal filling factor tor nu = 1 in a double-layer system have bimeron p seudospin textures. We studied the charge and pseudospin distributions and the energies of these quasiparticles as a function of layer separ ation, tunneling amplitude between the layers, and in-plant magnetic f ield strength by using a supercell microscopic unrestricted Hartree-Fo ck 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 qu asiparticle density, and on limitations of the unrestricted Hartree-Fo ck approach.