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We observe a small but definite decrease in quantized conductance at low temperatures in 2 to 10 μm-long single-mode quantum wires. The temperature dependence is stronger in the longer wires. The conductance of the 2 μm-long wire is nearly constant below a critical temperature, at which the thermal length becomes longer than the wire length, while that of the 5 and 10 μm-long wires decreases fairly...
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