Appleyard, N J , Nicholls, James, Pepper, M , Tribe, W R , Simmons, M Y and Ritchie, D A (2000) Direction-resolved transport and possible many-body effects in one-dimensional thermopower. Physical Review B, 62 (24).
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A single-particle theory due to Mott predicts a proportionality between the diffusion thermopower and the energy derivative of the logarithm of the conductance. Measurements of a ballistic ID wire show that the Mott theory remains valid in the presence of a finite current, and that it leads to a direction-sensitive probe of electron transport. We observe an apparent violation of the Mott model at low electron densities, when there is a nonquantized plateau in the conductance at 0.7(2e2/h). There is as yet no successful theoretical explanation of this so called 0.7 structure, but the distinctive thermopower signature, which deviates from single-particle predictions, may provide the key to a better understanding.
This is a Submitted version This version's date is: 15/12/2000 This item is not peer reviewed
https://repository.royalholloway.ac.uk/items/2efa9c9d-c155-0951-b1e4-e9a47e9dc3a2/7/
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