Electron spin polarization by isospin ordering in correlated two-layer quantum Hall systems

Abstract

Enhancement of the electron spin polarization in a correlated two-layer two-dimensional electron system at a total Landau level filling factor of one is reported. Using resistively detected nuclear magnetic resonance, we demonstrate that the electron spin polarization of two closely-spaced two-dimensional electron systems becomes maximized when inter-layer Coulomb correlations establish spontaneous isospin ferromagnetic order. This correlation-driven polarization dominates over the spin polarizations of competing single-layer fractional Quantum Hall states under electron density imbalances.

arXiv commentto be published in Physical Review Letters

References in corpus (15)

• Spontaneous Inter-layer Coherence in Double-Layer Quantum-Hall Systems I: Charged Vortices and Kosterlitz-Thouless Phase Transitions
• 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
• Unraveling the spin polarization of the v = 5/2 fractional quantum Hall state
• Activated Transport in the individual Layers that form the ${\nu }_T$=1 Exciton Condensate
• NMR probing of the spin polarization of the nu=5/2 quantum Hall state
• Critical tunneling currents in the regime of bilayer excitons
• Onset of Interlayer Phase Coherence in a Bilayer Two-Dimensional Electron System: Effect of Layer Density Imbalance
• Interlayer tunneling in counterflow experiments on the excitonic condensate in quantum Hall bilayers
• Spin Degree of Freedom in the nu =1 Bilayer Electron System Investigated via Nuclear Spin Relaxation
• Spin Transition in Strongly Correlated Bilayer Two Dimensional Electron Systems
• Observation of a new phase transition between fully and partially polarized quantum Hall states with charge and spin gaps at $\nu =2/3$
• Charge Imbalance and Bilayer 2D Electron Systems at ${\nu }_T=1$
• Quantum Hall Exciton Condensation at Full Spin Polarization
• Intrinsic gap and exciton condensation in the nu_T=1 bilayer system