Rectification in one--dimensional electronic systems

Details Rectification in one--dimensional electronic systems Rectification in one--dimensional electronic systems

2005-06-03

arxiv.org/abs/cond-mat/0506095v2

Phys. Rev. B 72, 125311 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages; 3 figures

Scientific paper

10.1103/PhysRevB.72.125311

Asymmetric current--voltage ($I(V)$) curves, known as the diode or rectification effect, in one--dimensional electronic conductors can have their origin from scattering off a single asymmetric impurity in the system. We investigate this effect in the framework of the Tomonaga--Luttinger model for electrons with spin. We show that electron interactions strongly enhance the diode effect and lead to a pronounced current rectification even if the impurity potential is weak. For strongly interacting electrons and not too small voltages, the rectification current, $I_r = [I(V)+I(-V)]/2$, measuring the asymmetry in the current--voltage curve, has a power--law dependence on the voltage with a negative exponent, $I_r \sim V^{-|z|}$, leading to a bump in the current--voltage curve.

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