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Pseudospin solitons in the coherent stripe phase of a bilayer quantum Hall system
Authors:CB Doiron  R Ct  HA Fertig
Institution:aDépartement de physique and RQMP, Université de Sherbrooke, Sherbrooke, Qué. Canada J1K 2R1;bDepartment of Physics, Indiana University, Bloomington, IN 47405, USA
Abstract:In the Hartree–Fock approximation and at total filling factor ν=4N+1, the ground state of the two-dimensional electron gas in a double quantum well system in a quantizing magnetic field is, in some range of interlayer distances, a coherent striped phase. This stripe 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 the energy 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.
Keywords:Quantum Hall effects  Bilayer  Stripes  Soliton
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