Simultaneous Excitation of Spins and Pseudospins in the Bilayer $\nu =1$ Quantum Hall State

Abstract

The tilting angular dependence of the energy gap was measured in the bilayer quantum Hall state at the Landau level filling $\nu =1$ by changing the density imbalance between the two layers. The observed gap behavior shows a continuous transformation from the bilayer balanced density state to the monolayer state. Even a sample with 33 K tunneling gap shows the same activation energy anomaly reported by Murphy {\it et al.}. We discuss a possible relation between our experimental results and the quantum Hall ferromagnet of spins and pseudospins.

4 pages, 4 figures

References in corpus (7)

• Spontaneous Inter-layer Coherence in Double-Layer Quantum-Hall Systems I: Charged Vortices and Kosterlitz-Thouless Phase Transitions
• Evidence for a Goldstone Mode in a Double Layer Quantum Hall System
• Evidence for Skyrmions and Single Spin Flips in the Integer Quantized Hall Effect
• Quantum Ferromagnetism and Phase Transitions in Double-Layer Quantum Hall Systems
• Phase Transition in ν=2 Bilayer Quantum Hall State
• Incommensurate ground state of double-layer quantum Hall systems
• Spin-Pseudospin Coherence and CP${}^3$ Skyrmions in Bilayer Quantum Hall Ferromagnets

Cited by in corpus (6)

• SU(4) Skyrmions and Activation Energy Anomaly in Bilayer Quantum Hall Systems
• Spin gap in the 2D electron system of GaAs/AlGaAs single heterojunctions in weak magnetic fields
• Collective modes of CP(3) Skyrmion crystals in quantum Hall ferromagnets
• Pseudospin vortex-antivortex states with interwoven spin textures in double layer quantum Hall systems
• Microscopic Theory of Skyrmions in Quantum Hall Ferromagnets
• Large Zeeman Splitting in Out-of-Plane Magnetic Field in a Double-Layer Quantum Point Contact