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We present transport measurements of cleaved edge overgrowth GaAs quantumwires. The conductance of the first mode reaches 2 e^2/h at high temperatures T> 10 K, as expected. As T is lowered, the conductance is gradually reduced to 1e^2/h, becoming T-independent at T < 0.1 K, while the device cools far below0.1 K. This behavior is seen in several wires, is independent of density, andnot altered by moderate magnetic fields B. The conductance reduction by afactor of two suggests lifting of the electron spin degeneracy in absence of B.Our results are consistent with theoretical predictions for helical nuclearmagnetism in the Luttinger liquid regime.

Evidence for Helical Nuclear Spin Order in GaAs Quantum Wires