Dynamic nuclear polarization at the edge of a two-dimensional electron gas

Details Dynamic nuclear polarization at the edge of a two-dimensional electron gas Dynamic nuclear polarization at the edge of a two-dimensional electron gas

1997-01-07

arxiv.org/abs/cond-mat/9701039v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8 pages RevTeX, 7 figures (GIF); submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.56.4743

We have used gated GaAs/AlGaAs heterostructures to explore nonlinear transport between spin-resolved Landau level (LL) edge states over a submicron region of two-dimensional electron gas (2DEG). The current I flowing from one edge state to the other as a function of the voltage V between them shows diode-like behavior---a rapid increase in I above a well-defined threshold V_t under forward bias, and a slower increase in I under reverse bias. In these measurements, a pronounced influence of a current-induced nuclear spin polarization on the spin splitting is observed, and supported by a series of NMR experiments. We conclude that the hyperfine interaction plays an important role in determining the electronic properties at the edge of a 2DEG.

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