1,635 research outputs found
Aharonov-Bohm Exciton Absorption Splitting in Chiral Specific Single-Walled Carbon Nanotubes in Magnetic Fields of up to 78 T
The Ajiki-Ando (A-A) splitting of single-walled carbon nanotubes(SWNT)
originating from the Aharanov-Bohm effect was observed in chiral specific SWNTs
by the magneto-absorption measurements conducted at magnetic fields of up to 78
T. The absorption spectra from each chirality showed clear A-A splitting of the
optical excitonic transitions. The parameters of both the dark-bright
exciton energy splitting and the rate of A-A splitting in a magnetic field were
determined for the first time from the well-resolved absorption spectra.Comment: 5 pages, 3 figure
Comparative study of flux pinning, creep and critical currents between YBaCuO crystals with and without Y2BaCuO5 inclusions
In the Y-Ba-Cu-O system, YBa2Cu3O(x) phase is produced by the following peritectic reaction: Y2BaCuO5 + liquid yields 2YBa2Cu3O(x). Through the control of processing conditions and starting compositions, it becomes possible to fabricate large crystals containing fine Y2BaCuO5(211) inclusions. Such crystals exhibit Jc values exceeding 10000 A/sq cm at 77 K and 1T. Recently, researchers developed a novel process which can control the volume fraction of 211 inclusions. Elimination of 211 inclusions is also possible. In this study, researchers prepared YBaCuO crystals with and without 211 inclusions using the novel process, and compared flux pinning, flux creep and critical currents. Magnetic field dependence of Jc for YBaCuO crystals with and with 211 inclusions is shown. It is clear that fine 211 inclusions can contribute to flux pinning. It was also found that flux creep rate could be reduced by increasing flux pinning force. Critical current density estimates based on the conventional flux pinning theory were in good agreement with experimental results
Future changes in tropical cyclone activity projected by multi-physics and multi-SST ensemble experiments using the 60-km-mesh MRI-AGCM
Correlation, Breit and Quantum Electrodynamics effects on energy level and transition properties of W ion
The electron correlation effects and Breit interaction as well as Quantum
Electro-Dynamics (QED) effects were expected to have important contribution to
the energy level and transition properties of heavy highly charged ions. The
ground states [Ne] and first excited states
[Ne]3s of W ion have been studied by using
Multi-Configuration Dirac-Fock method with the implementation of Grasp2K
package. A restricted active space was employed to investigate the correlation
contribution from different models. The Breit interaction and QED effects were
taken into account in the relativistic configuration interaction calculation
with the converged wavefunction. It is found that the correlation contribution
from 3s and 3p orbital have important contribution to the energy level,
transition wavelength and probability of the ground and the first excited state
of W ion
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