Polarized Magnetic Wire Induced by Tunneling Through a Magnetic Impurity

Details Polarized Magnetic Wire Induced by Tunneling Through a Magnetic Impurity Polarized Magnetic Wire Induced by Tunneling Through a Magnetic Impurity

2002-11-20

arxiv.org/abs/cond-mat/0211447v1

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, submitted to PRL

Scientific paper

10.1103/PhysRevLett.90.116802

Using the zero mode method we compute the conductance of a wire consisting of a magnetic impurity coupled to two Luttinger liquid leads characterized by the Luttinger exponent $\alpha(\leq 1)$. We find for resonance conditions, in which the Fermi energy of the leads is close to a single particle energy of the impurity, the conductance as a function of temperature is $G \sim \frac{e^2}{h} (T/T_F)^{2(\alpha-2)}$, whereas for off-resonance conditions the conductance is $G \sim \frac{e^2}{h} (T/T_F)^{2(\alpha-1)}$. By applying a gate voltage and/or a magnetic field, one of the spin components can be in resonance while the other is off-resonance causing a strong asymmetry between the spin-up and spin-down conductances.

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