Solitonic Excitations in Linearly Coherent Channels of Bilayer Quantum Hall Stripes
arXiv:cond-mat/0507062 · doi:10.1103/PhysRevB.72.115336
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.
15 pages, 8 figures
References in corpus (7)
- Competition between quantum-liquid and electron-solid phases in intermediate Landau levels
- Dynamics of electrons in the quantum Hall bubble phases
- Spontaneous Symmetry Breaking and Exotic Quantum Order in Integer Quantum Hall Systems under a Tilted Magnetic Field
- Quantum Hall Stripe Phases at Integer Filling Factors
- Commensurate-incommensurate transitions of quantum Hall stripe states in double-quantum-well systems
- Dynamics of quantum Hall stripes in double-quantum-well systems
- Quantum theory of bilayer quantum Hall smectics