Topological Excitations in Double-Layer Quantum Hall systems

Abstract

Double-layer quantum Hall systems with spontaneous broken symmetry can exhibit a novel manybody quantum Hall effect due to the strong interlayer coherence. When the layer separation becomes close to the critical value, quantum fluctuations can destroy the interlayer coherence and the quantum Hall effect will disappear. We calculate the renormalized isospin stiffness ${\rho }_s$ due to quantum fluctuations within the Hartree-Fock-RPA formalism. The activation energy of the topological excitations thus obtained demonstrates a nice qualitative agreement with recent experiment.

4 pages (Revtex) + 3 ps-figures; Vertex corrections are added in the new version; accepted to Phys. Rev. Lett

References in corpus (5)

• Spontaneous Inter-layer Coherence in Double-Layer Quantum-Hall Systems I: Charged Vortices and Kosterlitz-Thouless Phase Transitions
• Quantum Ferromagnetism and Phase Transitions in Double-Layer Quantum Hall Systems
• Behaviour of the energy gap near a commensurate-incommensurate transition in double layer quantum Hall systems at nu=1
• Collective Modes of Soliton-Lattice States in Double-Quantum-Well Systems
• Quantum Hall Ferromagnets

Cited by in corpus (6)

• Strong Correlation to Weak Correlation Phase Transition in Bilayer Quantum Hall Systems
• Microscopic Functional Integral Theory of Quantum Fluctuations in Double-Layer Quantum Hall Ferromagnets
• Bias-voltage induced phase-transition in bilayer quantum Hall ferromagnets
• Observation of collapse of pseudospin order in bilayer quantum Hall ferromagnets
• Rippled state of double-layer quantum Hall systems
• Anisotropic Transport of Quantum Hall Meron-Pair Excitations