Doping structure

For the Dyakonov-Perel mechanism the randomness enters the spin precession due to the random time dependence of the momentum. However, as we have seen above, the randomness is an intrinsic property of the SO coupling. Therefore, it should lead to a spin relaxation even if the momentum of the electron remains constant. Below, we discuss this mechanism both for asymmetrically and symmetrically doped structures. Even in the latter case where... 

LIGHT-EMITTING PROPERTIES OF ERBIUM-DOPED STRUCTURES OF SILICON NANOCRYSTALS... 

Photoluminescence (PL) properties of Er-doped structures of Si nanocrystals in SiC>2 matrix are investigated at different temperatures and excitation intensities. Er-doped structures exhibit the PL line at 1.5 pm, which results from the radiative transitions in E + ions excited by the energy transfer from Si nanocrystals. The PL yield and lifetime are found to be dependent on the nanocrystal size, temperature, and excitation intensity. 

The highly doped structures referred to in the description of static lattice simulations (Section 5.3) as PAKl and PAK2 have also been investigated by MD by Sese and her colleagues. " As in the static studies the electronic charge transferred from the dopant atoms was distributed uniformly on the carbon atoms, which therefore bear net charges of -0.25e and -0.125e, respectively in the two species. 

Figure 6.17 Proposed self-doped structure of the PANA.

According to a recent report, the thermal stability of self-doped polyfanilineboronic acid) [220] is greater than that of HCl-doped polyaniline and other self-doped forms of polyaniline. This is due to a self-doped structure where the anion is immobilized in the form of a crosslink, resulting in conductivity up to 500 °C. This self-doped crosslinked structure is also responsible for enhanced mechanical properties including a hardness of 0.5 GPa [221]. 

NMR measurements have been made on two of the electron-doped high-temperature superconducting cuprates (HTSCs), Pr(2-x)Ce(x)Cu04 and Sro.9Lao.iCu02 that represent the two known electron-doped structures by static Cu NMR. ... 

However, the Mn-doped structure became amorphous during cycling and the most stable performance (150 mAh g after 50 cycles at 10mAg ) was obtained for the undoped sample. Once again, multielectron redox was not achieved. 

Furthermore, they chemically grafted the groups of -CH2CH3 onto the PBI backbone by a green and facile route (Figure 11.17b) the obtained AEM exhibited ionic conductivity and ethanol permeability of 22 mS/cm and 5.24 x 10 cmVs, respectively. By a single CH3CH20H/air cell test, it delivered a peak power density of about 11 mW/cm at A handful of reports on alkali-doped structural-modified PBI were also published recently." " ... 

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