Observation of collapse of pseudospin order in bilayer quantum Hall ferromagnets

Abstract

The Hartree-Fock paradigm of bilayer quantum Hall states with finite tunneling at filling factor $\nu$=1 has full pseudospin ferromagnetic order with all the electrons in the lowest symmetric Landau level. Inelastic light scattering measurements of low energy spin excitations reveal major departures from the paradigm at relatively large tunneling gaps. The results indicate the emergence of a novel correlated quantum Hall state at $\nu$=1 characterized by reduced pseudospin order. Marked anomalies occur in spin excitations when pseudospin polarization collapses by application of in-plane magnetic fields.

arXiv commentReVTeX4, 4 pages, 3 EPS figures

References in corpus (14)

• Counterflow measurements in strongly correlated GaAs hole bilayers: evidence for electron-hole pairing
• Vanishing Hall Resistance at High Magnetic Field in a Double Layer Two-Dimensional Electron System
• Quantum Ferromagnetism and Phase Transitions in Double-Layer Quantum Hall Systems
• Theory of interlayer tunneling in bi-layer quantum Hall ferromagnets
• Double-layer quantum Hall antiferromagnetism at filling fraction nu=2/(odd integer)
• Josephson Effect Without Superconductivity: Realization in Quantum Hall Bilayers
• 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
• Lattice Pseudospin Model for $\nu =1$ Quantum Hall Bilayers
• Observation of soft magnetorotons in bilayer quantum Hall ferromagnets
• Topological Excitations in Double-Layer Quantum Hall systems
• Raman Scattering Spectra of Elementary Electronic Excitations in Coupled Double-Quantum Well Structures
• Spin-squeezed Ground States in the Bilayer Quantum Hall Ferromagnet
• Optical absorption in the soliton-lattice state of a double-quantum-well system

Cited by in corpus (10)

• Excitonic Superfluid to pseudo-spin density wave transition in bilayer quantum Hall systems
• Numerical Study of Quantum Hall Bilayers at Total Filling ${\nu }_T=1$: A New Phase at Intermediate Layer Distances
• Intrinsic gap and exciton condensation in the nu_T=1 bilayer system
• Gauge Fluctuations and Interlayer Coherence in Bilayer Composite Fermion Metals
• Clausius-Clapeyron Relations For First Order Phase Transitions In Bilayer Quantum Hall Systems
• Quantum Hall to Insulator Transition in the Bilayer Quantum Hall Ferromagnet
• Metamorphosis of a Quantum Hall Bilayer State into a Composite Fermion Metal
• Bilayer Quantum Hall Ferromagnet in a Periodic Potential
• Evidence of inter-layer interaction in magneto-luminescence spectra of electron bilayers
• Evidence of a first-order quantum phase transition of excitons in electron double layers