In his thesis J. Kokalj investigates spectral properties of correlated electron systems with the emphasis on the validity of the Luttinger theorem: He shows, that the theorem fails in many cases. He implements a new numerical method for the description of dynamics of one – dimensional systems at finite temperatures. His research was published in five scientific publications.

D.09 Tutoring for postgraduate students

COBISS.SI-ID: 251626496Using exact diagonalization within a limited functional space we have explored the kinetic energy and the effective mass of polaron and bipolaron in the t-J-Holstein model. With increasing electron-phonon coupling bipolaron kinetic energy is lowered in comparison with that of the polaron. This effect is accompanied with "undressing" of bipolaron from lattice degrees of freedom. Our results lead to a novel paradigm where in a correlated system, coupled to quantum lattice degrees of freedom, upon pair formation the bipolaron mobility increases.

B.04 Guest lecture

COBISS.SI-ID: 2295396We have developed a model of birelaxors, that is materials, that exhibit properties of relaxor ferroelectrics as well as relaxor ferromagnets. We have estimated the strength of the magnetic field that completely slows down dielectric relaxation at room temperature. This is a new phenomena that was recently discovered in thin films PFW/PZT.

B.04 Guest lecture

COBISS.SI-ID: 23710759T. Prosen in his article explains the basics of quantum entanglement and shows different possibilities of its future practical use.

COBISS.SI-ID: 251405312

We reviewed the electronic transport and entanglement properties of coupled quantum dots. In particular, we will concentrate on the influence of molecular vibrations. In general two types of vibrations are relevant: (i) the breathing type of internal molecular modes, where the coupling occurs between the molecular deformation and the charge density, and (ii) the oscillations of molecules between the contacts, where the displacement affects the tunneling. (iii) In double quantum dot systems interdot vibrational modes can lead to effects not found in purely electronic systems.

B.04 Guest lecture

COBISS.SI-ID: 2295652