Boundary-mediated electron-electron interactions in quantum point contacts.
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.
NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi 243-0198, Japan.
V T
VT
Renard
O A
OA
Tkachenko
V A
VA
Tkachenko
T
T
Ota
N
N
Kumada
J-C
JC
Portal
Y
Y
Hirayama