Zobrazeno 1 - 10
of 26
pro vyhledávání: '"C. Da Cunha"'
Publikováno v:
Journal of Superconductivity and Novel Magnetism. 26:2201-2207
We investigate the spin-polarized transport of holes in GaMnAs/GaAs heterostructures with Mn concentration 5% in which a ferromagnetic order is known to exist. Disorder enters the problem both in the random distribution of Mn centers and impurities,
Publikováno v:
Journal of Magnetism and Magnetic Materials. 320:e400-e403
We describe the transport properties of a Ga 1 - y Al y As / Ga 1 - x Mn x As resonant tunneling diode (RTD). In previous works we have studied the transport of holes at the valence band (VB), considering the contacts made of GaAs:Be (p-doped). We no
Publikováno v:
Physics Letters A. 365:501-504
We investigate the spin relaxation and spin dephasing of $n$-type GaAs quantum wells. We obtain the spin relaxation time $T_1$, the spin dephasing time $T_2$ and the ensemble spin dephasing time $T_2^{\ast}$ by solving the full microscopic kinetic sp
Publikováno v:
Physica B: Condensed Matter. 366:153-161
We report a systematic and detailed lattice dynamical investigation on the intrinsic insulating phase of the cobalt oxide superconductor NaCoO 2 . The phonon dispersion curves, partial and total phonon densities of states are obtained. The calculated
Autor:
I. C. da Cunha Lima
Publikováno v:
Microelectronics Journal. 34:475-480
Modulated disorder and correlation are responsible for typical behavior of the transport properties of low-dimensional systems. Advances in molecular beam epitaxy lead to the realization of high quality nanostructures of Diluted Magnetic Semiconducto
Publikováno v:
Journal of Superconductivity. 16:283-287
It is shown that spin-polarized currents occur in metallic and ferromagnetic Ga1−xMnxAs/GaAs multilayered structures, as a result of the magnetic interaction between holes and the Mn ions. The magnetic layers act as potential barriers for holes wit
Publikováno v:
Physical Review B. 62:8895-8902
The magnetic order resulting from a confinement-adapted Ruderman-Kittel-Kasuya-Yosida indirect exchange between magnetic moments in the metallic phase of a $\mathrm{AlAs}/{\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{As}$ quantum well is s
Publikováno v:
Journal of Superconductivity. 16:303-305
We present results for the single-particle relaxation time of the spin-polarized two-dimensional electron gas in Silicon-MOSFET systems at zero temperatures. Spin-polarization is produced by the application of a parallel magnetic field. The single-pa
Publikováno v:
Physical Review B. 84
We use Monte Carlo simulations to analyze electric-field control of Curie temperature ${T}_{C}$ for carrier-mediated ferromagnetism in semiconductors. Gating employed to achieve electrostatic doping in an optimized geometry of (Ga, Mn)As, a prototypi
Publikováno v:
Journal of Magnetism and Magnetic Materials. :1362-1364
The magnetic order resulting from a confinement-adapted Ruderman–Kittel–Kasuya–Yosida indirect exchange between magnetic moments in the metallic phase of AlAs/Ga 1− x Mn x As structures is studied by Monte Carlo simulation. This coupling mech