Probing Quantum Hall Pseudospin Ferromagnet by Resistively Detected NMR

Abstract

Resistively Detected Nuclear Magnetic Resonance (RD-NMR) has been used to investigate a two-subband electron system in a regime where quantum Hall pseudo-spin ferromagnetic (QHPF) states are prominently developed. It reveals that the easy-axis QHPF state around the total filling factor $\nu =4$ can be detected by the RD-NMR measurement. Approaching one of the Landau level (LL) crossing points, the RD-NMR signal strength and the nuclear spin relaxation rate $1/T_1$ enhance significantly, a signature of low energy spin excitations. However, the RD-NMR signal at another identical LL crossing point is surprisingly missing which presents a puzzle.

References in corpus (5)

• Multiple Phases with the Same Quantized Hall Conductance in a Two-Subband System
• Landau Level Anticrossing Manifestations in the Phase Diagram Topology of a Two Subband System
• Observation of Inter-Valley Gap Anomaly of Two Dimensional electrons in Silicon
• NMR Probing Spin Excitations in the Ring-Like Structure of a Two-Subband System
• Dependence of persistent gaps at Landau level crossings on relative spin

Cited by in corpus (6)

• Dynamic Nuclear Polarization and Nuclear Magnetic Resonance in the Simplest Pseudospin Quantum Hall Ferromagnet
• Dispersive line shape in the vicinity of the ν = 1 quantum Hall state: Coexistence of Knight shifted and unshifted resistively detected NMR responses
• Resistively detected nuclear magnetic resonance via a single InSb two-dimensional electron gas at high temperature
• Many-body effects on the ${\rho }_{xx}$ ringlike structures in two-subband wells
• Pump-probe nuclear spin relaxation study of the quantum Hall ferromagnet at filling factor nu = 2
• Exact Exchange: a pathway for a Density Functional Theory of the Integer Quantum Hall Effect