Seminar "Coherence-Correlations-Complexity", Dept. of Theoretical Physics, Wrocław University of Technology
Sala 320a bud. A-1, Politechnika Wrocławska
Spintronic transport through quantum dots in the Kondo regime
dr hab. Ireneusz Weymann, prof. UAM
Wydział Fizyki Uniwersytetu Adama MIckiewicza w Poznaniu
In this talk I will discuss the spin-resolved transport properties of quantum dots strongly coupled to external ferromagnetic leads. Special emphasis will be put on analyzing the low-temperature transport behavior when the electronic correlations give rise to the Kondo effect. I will present results of theoretical calculations of the linear conductance and the tunnel magnetoresistance (TMR) associated with a change of device’s magnetic configuration form parallel to antiparallel one. The results, obtained with the aid of the numerical renormalization group method, will be discussed in context of existing experimental data. I will show that system’s transport behavior greatly depends on a subtle interplay between ferromagnetic-contact-induced exchange field and the Kondo temperature, giving rise to nontrivial behavior of both the linear conductance and TMR. I will also discuss the transport properties of double quantum dots where more exotic Kondo phenomena emerge, and analyze the influence of spin-dependent tunneling on them.
