NMR Probing Spin Excitations in the Ring-Like Structure of a Two-Subband System

Abstract

Resistively detected nuclear magnetic resonance (NMR) is observed inside the ring-like structure, with a quantized Hall conductance of 6e^2/h, in the phase diagram of a two subband electron system. The NMR signal persists up to 400 mK and is absent in other states with the same quantized Hall conductance. The nuclear spin-lattice relaxation time, T1, is found to decrease rapidly towards the ring center. These observations are consistent with the assertion of the ring-like region being a ferromagnetic state that is accompanied by collective spin excitations.

4 pages, 4 figures

References in corpus (2)

• Two-subband quantum Hall effect in parabolic quantum wells
• Landau Level Anticrossing Manifestations in the Phase Diagram Topology of a Two Subband System

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• Exact Exchange: a pathway for a Density Functional Theory of the Integer Quantum Hall Effect