Quantum Correction to Conductivity Close to Ferromagnetic Quantum Critical Point in Two Dimensions

Details Quantum Correction to Conductivity Close to Ferromagnetic Quantum Critical Point in Two Dimensions Quantum Correction to Conductivity Close to Ferromagnetic Quantum Critical Point in Two Dimensions

2005-02-09

arxiv.org/abs/cond-mat/0502252v3

Phys. Rev. Lett. \bf{95}, 017206 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 1 figure

Scientific paper

10.1103/PhysRevLett.95.017206

We study the temperature dependence of the conductivity due to quantum interference processes for a two-dimensional disordered itinerant electron system close to a ferromagnetic quantum critical point. Near the quantum critical point, the cross-over between diffusive and ballistic regimes of quantum interference effects occurs at a temperature $ T^{\ast}=1/\tau \gamma (E_{F}\tau)^{2}$, where $\gamma $ is the parameter associated with the Landau damping of the spin fluctuations, $\tau $ is the impurity scattering time, and $E_{F}$ is the Fermi energy. For a generic choice of parameters, $T^{\ast}$ is smaller than the nominal crossover scale $1/\tau $. In the ballistic quantum critical regime, the conductivity behaves as $T^{1/3}$.

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