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

1997/01/07 by D. Dixon, David C. Dixon, Keith R. Wald +3 · 2 citations
Chemistry · Physics and Astronomy · #Atomic physics #Biasing #Chemistry #Condensed matter physics #Electron #Enhanced Data Rates for GSM Evolution #Fermi gas #Heterojunction #Hyperfine structure #Physics #Physics of Superconductivity and Magnetism #Polarization (electrochemistry) #Quantum and electron transport phenomena #Quantum mechanics #Semiconductor Quantum Structures and Devices #Spin polarization #Voltage #cond-mat.mes-hall

paper · pdf · doi:10.1103/physrevb.56.4743

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

arxiv created 1997/01/07 · openalex publication_date 1997/08/15 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We have used gated GaAs/Al_xGa_1\ensuremath-xAs heterostructures to explore nonlinear transport between spin-resolved Landau level edge states over a submicrometer 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 diodelike 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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• Temperature-dependent dynamical nuclear polarization bistabilities in double quantum dots in the spin-blockade regime
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