Ioannis Margaris

University of Crete | UOC · Department of Physics

The market share of innovative PV module designs with features like cut cells and unconventional topologies is growing rapidly. These features make the power rating measurement under standard testing conditions of innovative PV modules different from that of conventional PV modules. This work aims to investigate the effect of irradiance non-uniform...

In this work we present a method of representing terms in the current-phase-relation of a ballistic Josephson junction by combinations of diagrams, used in previous work to represent an equivalent of the matching condition determinant of the junction. This is accomplished by the expansion of the logarithm of this determinant in Taylor series and ke...

We present a numerical study of ferromagnetic Josephson junctions with one intermediate layer and spin active interfaces in the ballistic regime, comparing the behaviour of one, two and three dimensional junctions. We find that in two and three dimensional junctions the geometries which lack spin flip scattering at one of the interfaces have a crit...

Superconducting metamaterials comprising rf SQUIDs (Superconducting QUantum Interference Devices) have been recently realized and investigated with respect to their tuneability, permeability and dynamic multistability properties. These properties are a consequence of intrinsic nonlinearities due to the sensitivity of the superconducting state to ex...

We present a study of quantum scattering systems in one space dimension with different spatial asymptotics on the left and right, using as a specific model a ferromagnetic Josephson junction with inhomogeneous magnetization texture. So except for the space dimension there is also a particle-hole and a spin degree of freedom. We focus on the station...

We analyse both analytically and numerically a ballistic ferromagnetic Josephson junction with spin active interfaces, focusing on the zero phase difference supercurrent that appears when the magnetizations of the intermediate layer and the interfaces form a non-coplanar set of vectors. We claim that the presence of even one magnetization vector in...

We consider a double-barrier superconductor/ferromagnet/superconductor (S/I/F/I/S) ballistic junction with thin insulating layers at the interfaces. Using a diagrammatic approach we obtain the Andreev spectrum and the supercurrent in terms of the S/F interface scattering amplitudes. We use the rules devised for the summation of the multiple scatter...

We consider a superconductor/multiferromagnet/superconductor (S/I/F1/ /Fn/I/S) ballistic junction with thin insulating layers in the interfaces. We develop a diagrammatic approach for the equation that determines the Andreev spectrum, by examining the closed loops in the intermediate ferromagnetic layers. It is expressed in terms of the S/F and F/F...

We consider a superconductor/double-ferromagnet/superconductor (S/I 1/F/Ic/F'/I2/S) ballistic junction with thin insulating layers in the interfaces. An extensive investigation is carried out for the possibility of 0- or π-junction and the important phaseshift. The average exchange field for the two ferromagnets has limited use, only for weak excha...

In this work we consider a ballistic superconductor/multilayer–ferromagnet/superconductor junction, with interface scattering potential, which can be different in strength. We develop, for an arbitrary number of layers, compact analytic formulae for the Andreev bound state spectrum and the supercurrent. The phase dependence of the supercurrent is o...