Articles dans des revues à comité de lecture
|Effective pseudospin wave model for the coherent stripe phase in a bilayer system|
|Faribault A., Cote R., Fertig, H.A.|
|PHYSICA E 34 (2006) 183|
|DOI : 10.1016/j.physe.2006.03.011|
Hartree-Fock theory predicts a stripe-like ground state for the two-dimensional electron gas in a bilayer quantum Hall system in a quantizing magnetic field at filling factor 4N + 1 (with N > 0). This stripe state contains quasi-ID linear coherent regions where electrons are delocalized across both wells and which support low-energy collective excitations in the form of phonons and pseudospin waves. We have recently computed the dispersion relation of these low-energy modes in the generalized random phase approximation. In this work, we propose an effective pseudospin model in which the stripe state is modeled as an array of coupled I D anisotropic X-Y systems. The coupling constants and stiffness of our model are extracted from the density and pseudospin response functions computed in the GRPA.