Boundary-mediated electron-electron interactions in quantum point contacts

BRL; BRL); Institute of semiconductor Physics); J.-C. Portal (LCMI); LCMI); N. Kumada (NTT; O. A. Tkachenko (LCMI; SORST-JST; Tohoku University); T. Ota (NTT

arxiv: 0803.3503 · v2 · pith:YYFWAISZnew · submitted 2008-03-25 · ❄️ cond-mat.mes-hall

Boundary-mediated electron-electron interactions in quantum point contacts

Vincent Thomas Francois Renard (NTT , BRL , LCMI) , O. A. Tkachenko (LCMI , Institute of semiconductor Physics) , V.A. Tkachenko (Institute of semiconductor Physics) , T. Ota (NTT , BRL)

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N. Kumada (NTT J.-C. Portal (LCMI) Y. Hirayama (NTT SORST-JST Tohoku University)

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keywords contactselectron-electroninteractionspointquantumaccountingariesarises

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An unusual increase of the conductance with temperature is observed in clean quantum point contacts for conductances larger than 2e^2/h. At the same time a positive magnetoresistance arises at high temperatures. A model accounting for electron-electron interactions mediated by bound- aries (scattering on Friedel oscillations) qualitatively describes the observation. It is supported by numerical simulation at zero magnetic field.

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Boundary-mediated electron-electron interactions in quantum point contacts

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