We predict a new type of phase transition in a quasi-two dimensional system of electrons at high magnetic fields, namely the stabilization of a density wave which transforms a two dimensional open Fermi surface into a periodic chain of large pockets with small distances between them. The quantum...

We studied the influence of the nuclear spin diffusion on the dynamical nuclear polarization of low dimensional nanostructures subject to optical pumping. Our analysis shows that the induced nuclear spin polarization in semiconductor nanostructures will develop both a time and position...

The possibility to obtain ferromagnetic (FM) phase from native defects in WO<Subscript>3</Subscript> is investigated by theoretically analyzing six different crystalline structures. The local magnetic moment from vacancies is calculated using the projector augmented wave method in combination with the local spin...</subscript>

The excitation spectrum of the frustrated spin-1/2 Heisenberg chain is reexamined using variational and exact diagonalization calculations. We show that the overlap matrix of the short-range resonating valence bond states basis can be inverted which yields tractable equations for single and two...

The density matrix renormalization group and quantum Monte Carlo calculations are used to study ferromagnetism in the one- and two-dimensional asymmetric Hubbard model. The model is examined for a wide range of electron concentrations n, Coulomb interactions U and down-spin electron hopping...

PbCrO<Subscript>3</Subscript> is found experimentally to be a cubic perovskite with an abnormally large lattice constant of about 4.00 Å. To date, no successful first principle calculations have been carried out for cubic PbCrO<Subscript>3</Subscript> perovskite. Combining the generalized-gradient approximations and a structurally...</subscript></subscript>

We develop the full t-matrix theory of quasiparticle interference (QPI) for non-centrosymmetric (NCS) superconductors with Rashba spin-orbit coupling. We give a closed solution for the QPI spectrum for arbitrary combination and strength of nonmagnetic (V <Subscript> c </Subscript>) and magnetic (V <Subscript> m </Subscript>) impurity...</subscript></subscript>

A theoretical study has been carried out to analyse the available results from the inelastic neutron scattering experiment performed on a quasi-two dimensional spin- \hbox{$\frac{1}{2}$} 1 2 ferromagnetic material K<Subscript>2</Subscript>CuF<Subscript>4</Subscript>. Our formalism is based on a conventional semi-classical like treatment...</subscript></subscript>

The collective elementary excitations of two-dimensional magnetoexcitons in a Bose-Einstein condensate (BEC) with wave vector <Emphasis Type="Bold">k = 0 were investigated in the framework of the Bogoliubov theory of quasiaverages. The Hamiltonian of the electrons and holes lying in the lowest Landau levels (LLLs)...</emphasis>

The effect of optimum dilution of antiferromagnetic (AF)/ferromagnetic (FM) interface necessary for observance of positive exchange bias in ion-beam sputtered Si/Ir<Subscript>22</Subscript>Mn<Subscript>78</Subscript> (t <Subscript>AF</Subscript> = 12, 18, 24 nm)/Co<Subscript>20</Subscript>Fe<Subscript>60</Subscript>B<Subscript>20</ Subscript>(t <Subscript>FM</Subscript> = 6,9,15 nm) exchange coupled bilayers is investigated by magnetic annealing...</subscript><//></subscript></subscript></subscript></subscript></subscript></subscript>