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Solitonic Excitations in Linearly Coherent Channels of Bilayer Quantum Hall Stripes

Research paper by C. B. Doiron, R. Côté, H. A. Fertig

Indexed on: 03 Jul '05Published on: 03 Jul '05Published in: Physics - Mesoscopic Systems and Quantum Hall Effect



Abstract

In some range of interlayer distances, the ground state of the two-dimensional electron gas at filling factor nu =4N+1 with N=0,1,2,... is a coherent stripe phase in the Hartree-Fock approximation. This phase has one-dimensional coherent channels that support charged excitations in the form of pseudospin solitons. In this work, we compute the transport gap of the coherent striped phase due to the creation of soliton-antisoliton pairs using a supercell microscopic unrestricted Hartree-Fock approach. We study this gap as a function of interlayer distance and tunneling amplitude. Our calculations confirm that the soliton-antisoliton excitation energy is lower than the corresponding Hartree-Fock electron-hole pair energy. We compare our results with estimates of the transport gap obtained from a field-theoretic model valid in the limit of slowly varying pseudospin textures.