English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

We apply a recently developed nonequilibrium real-time renormalization groupmethod in frequency space to describe nonlinear quantum transport through asmall fermionic quantum system coupled weakly to several reservoirs via spinand/or orbital fluctuations. We provide an analytic and well-controlledprocedure to solve the RG equations in the weak-coupling regime. Within a2-loop analysis, we derive analytic formulas for the nonlinear conductance andthe kernel determining the time evolution of the reduced density matrix. Mostimportantly, we present a consistent formalism how the RG flow is cut off byrelaxation and dephasing rates, which is necessary to calculate the preciseline shape at resonances. We apply the general formalism to the nonequilibriumanisotropic Kondo model at finite magnetic field. We consider the weak-couplingregime, where the maximum of voltage and bare magnetic field is larger than theKondo-temperature. In this regime, we calculate the nonlinear conductance, themagnetic susceptibility, the renormalized spin relaxation and dephasing rates,and the renormalized g-factor. All quantities are considered up to the firstlogarithmic contributions at resonance. Up to a redefinition of the Kondotemperature, we confirm previous results for the conductance and the magneticsusceptibility in the isotropic case. In addition, we present a consistentcalculation of the line shape at the resonances, including the determinationwhich rate cuts off the logarithmic divergence. Furthermore, we calculate therates and the renormalized g-factor in nonequilibrium beyond leading order,being quantities characterizing the exponential decay of the time evolution ofthe magnetization. For all quantities we analyse also the anisotropic case andfind interesting nonequilibrium effects at resonance.

Real-time renormalization group in frequency space: A 2-loop analysis of the nonequilibrium anisotropic Kondo model at finite magnetic field