Possible evidence for helical nuclear spin order in gaas quantum wires
Physical review letters, 2014•APS
We present transport measurements of cleaved edge overgrowth GaAs quantum wires. 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 1 e 2/h, becoming T independent at
T≲ 0.1 K, while the device cools far below 0.1 K. This behavior is seen in several wires, is
independent of density, and not altered by moderate magnetic fields B. The conductance
reduction by a factor of 2 suggests lifting of the electron spin degeneracy in the absence of …
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 1 e 2/h, becoming T independent at
T≲ 0.1 K, while the device cools far below 0.1 K. This behavior is seen in several wires, is
independent of density, and not altered by moderate magnetic fields B. The conductance
reduction by a factor of 2 suggests lifting of the electron spin degeneracy in the absence of …
We present transport measurements of cleaved edge overgrowth GaAs quantum wires. The conductance of the first mode reaches at high temperatures , as expected. As is lowered, the conductance is gradually reduced to , becoming independent at , while the device cools far below . This behavior is seen in several wires, is independent of density, and not altered by moderate magnetic fields . The conductance reduction by a factor of 2 suggests lifting of the electron spin degeneracy in the absence of . Our results are consistent with theoretical predictions for helical nuclear magnetism in the Luttinger liquid regime.
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