Nonequilibrium Kondo transport through a quantum dot in a magnetic field
| Autor: | Smirnov, Sergey, Grifoni, Milena |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
71.70.Ej
Condensed Matter - Strongly Correlated Electrons Condensed Matter - Mesoscale and Nanoscale Physics Strongly Correlated Electrons (cond-mat.str-el) ddc:530 Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 71.10.Ay FOS: Physical sciences Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 530 Physik Kondo effect quantum dots magnetic field nonequilibrium Keldysh field integral theory 75.30.Mb |
| DOI: | 10.5283/epub.28624 |
| Popis: | We analyze universal transport properties of a strongly interacting quantum dot in the Kondo regime when the quantum dot is placed in an external magnetic field. The quantum dot is described by the asymmetric Anderson model with the spin degeneracy removed by the magnetic field resulting in the Zeeman splitting. Using an analytical expression for the tunneling density of states found from a Keldysh effective field theory, we obtain in the whole energy range the universal differential conductance and analytically demonstrate its Fermi-liquid and logarithmic behavior at low- and high-energies, respectively, as a function of the magnetic field. We also show results on the zero temperature differential conductance as a function of the bias voltage at different magnetic fields as well as results on finite temperature effects out of equilibrium and at a finite magnetic field. The modern nonequilibrium experimental issues of the critical magnetic field, at which the zero bias maximum of the differential conductance starts to split into two maxima, as well as the distance between these maxima as a function of the magnetic field are also addressed. Comment: Published version; First submission to NJP: 27.03.2013; Second submission to NJP: 06.05.2013 |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|