Boundary-mediated electron-electron interactions in quantum point contacts |
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| Authors: | Renard V T Tkachenko O A Tkachenko V A Ota T Kumada N Portal J-C Hirayama Y |
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| Affiliation: | NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi 243-0198, Japan. |
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| Abstract: | An unusual increase of the conductance with temperature is observed in clean quantum point contacts for conductances larger than 2(e2/h). At the same time, a positive magnetoresistance arises at high temperatures. A model accounting for electron-electron interactions mediated by boundaries (scattering on Friedel oscillations) qualitatively describes the observation. It is supported by a numerical simulation at zero magnetic field. |
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