Nanotechnology Research and Practice

4-12

Authors: Behtouei Mostafa, Maleki Sheikh Abadi Amin, Ebrahim Heidari Samiromi

The spin resolved conductance in a quantum ring with one input and two output leads in the presence of the Rashba spin-orbit interaction (RSOI) and the Dresselhaus spin-orbit interaction (DSOI) has been studied. The conditions needed for perfect spin polarization including the value of the Rashba and Dresselhaus coupling strength and the values of the electron energy are investigated coupled strongly with the leads. Our calculations are performed using the non-equilibrium Green’s function method and Griffith boundary condition in the framework of the tight binding model. It is shown that the spin-polarized transport and polarizability can be controlled by the RSOI and/or DSOI in the effects of applied magnetic field treading the ring, but also on the bias applied between the input and output leads. Results of this paper can be used in designing perfect spin inverters. The effects of relative positions of the drain electrodes on the perfect spin polarization are also investigated.

23-36

Authors: Ignat Ignatov, Oleg Mosin

We studied the composition and structural properties of the amorphous, uncrystallized, fullerene analogous, carbon containing natural mineral shungite from Zazhoginskoe deposit in Karelia (Russian Federation) and the microporous crystalline aluminosilicate mineral zeolite (Most, Bulgaria) for evaluation of the mathematical model of interaction of these minerals with water. There are submitted data about the nanostructure, obtained with using of transmission electron microscopy (TEM-method), IR-spectroscopy (NES and DNES-method), as well as composition and physical chemical properties of these minerals. For evaluation of the mathematical model of interaction of these minerals with water, the methods of non-equilibrium spectrum (NES) and differential non-equilibrium spectrum (DNES) of water were applied. The average energy (∆EH... O) of hydrogen Н…O-bonds among individual molecules H2O after treatment of shungite and zeolite with water was measured at -0,1137 eV for shungite and -0,1174 eV for zeolite. The calculation of ∆EH... O for shungite with using DNES method compiles +0,0025±0,0011 eV and for zeolite -1,2±0,0011 eV. This result suggests the restructuring of ∆EH...O values among the individual H2O molecules in the samples, with a statistically reliable increase of local maximums in DNES-spectra.