Nonlinear response of a clean one-dimensional wire.
We study nonlinear transport in a clean one-dimensional wire fabricated by cleaved edge overgrowth in molecular beam epitaxy. At low electron densities, and with a large applied bias, we observe a feature in the differential conductance similar to the so-called "0.7 structure," found in quantum point contact devices. Using a simple model we suggest a link between this phenomenon, charge neutrality, and unidirectional dynamics in the wire.
de Picciotto
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Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974, USA.
Pfeiffer
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Baldwin
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West
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