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- W4256160977 abstract "We extend the microscopic Fermi-liquid theory for the Anderson impurity [Phys. Rev. B 64, 153305 (2001)] to explore nonequilibrium transport at finite magnetic fields. Using the Ward identities in the Keldysh formalism with the analytic and antisymmetric properties of the vertex function, the spin-dependent Fermi-liquid corrections of order ${T}^{2}$ and ${(eV)}^{2}$ are determined at low temperatures $T$ and low bias voltages $eV$. Away from half filling, these corrections can be expressed in terms of the linear and nonlinear static susceptibilities which represent the two-body and three-body fluctuations, respectively. We calculate the nonlinear susceptibilities using the numerical renormalization group, to explore the differential conductance $dI/dV$ through a quantum dot. We find that the two-body fluctuations dominate the corrections in the Kondo regime at zero magnetic field. The contribution of the three-body fluctuations becomes significant far away from half filling, especially in the valence-fluctuation regime and empty-orbital regimes. In finite magnetic fields, the three-body contributions become comparable to the two-body contributions, and play an essential role in the splitting of the zero-bias conductance peak occurring at a magnetic field of the order of the Kondo energy scale. We also apply our microscopic formulation to the magnetoresistance and thermal conductivity of dilute magnetic alloys away from half filling." @default.
- W4256160977 created "2022-05-12" @default.
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- W4256160977 date "2018-01-24" @default.
- W4256160977 modified "2023-10-10" @default.
- W4256160977 title "Higher-order Fermi-liquid corrections for an Anderson impurity away from half filling: Nonequilibrium transport" @default.
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- W4256160977 doi "https://doi.org/10.1103/physrevb.97.035435" @default.
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