88 research outputs found
Magnetic-field-induced singularities in spin dependent tunneling through InAs quantum dots
Current steps attributed to resonant tunneling through individual InAs
quantum dots embedded in a GaAs-AlAs-GaAs tunneling device are investigated
experimentally in magnetic fields up to 28 T. The steps evolve into strongly
enhanced current peaks in high fields. This can be understood as a
field-induced Fermi-edge singularity due to the Coulomb interaction between the
tunneling electron on the quantum dot and the partly spin polarized Fermi sea
in the Landau quantized three-dimensional emitter.Comment: 5 pages, 4 figure
Orbital Symmetry of Ba(Fe1-xCox)2As2 Superconductors Probed with X-ray Absorption Spectroscopy
The orbital symmetries of electron doped iron-arsenide superconductors
Ba(Fe1-xCox)2As2 have been measured with x-ray absorption spectroscopy. The
data reveal signatures of Fe d electron itinerancy, weak electronic
correlations, and a high degree of Fe-As hybridization related to the bonding
topology of the Fe dxz+yz states, which are found to contribute substantially
at the Fermi level. The energies and detailed orbital character of Fe and As
derived unoccupied s and d states are found to be in remarkably good agreement
with the predictions of standard density functional theory.Comment: Accepted for publication in Phys. Rev. B, 3 figures. Minor
corrections adde
Electronic Structure of B-2p State in AlB2 Single Crystal: Direct Observation ofp\sigma and p\pi Density of States
X-ray emission (XES) and absorption (XAS) spectra near the B- edge were
measured on single-crystalline AlB compound which is an isostructural
diboride of superconducting MgB. The partial density of states (PDOS) of
B-2 and orbitals were derived from the polarization dependence
of XES and XAS spectra. There are considerable amounts of PDOS near the Fermi
energy in AlB similarly to that in MgB, but there are almost no PDOS in
orbitals of AlB near the Fermi energy, i.e., a pseudo-gap in
state and a broad metallic state in state are observed. The
present result indirectly supports scenarios that the holes play an
important role in the occurrence of superconductivity in MgB. The overall
features of PDOS were found to be in good agreement with the result of band
calculation of AlB, but a small discrepancy in the Fermi energy is
observed, which is attributed to the Al vacancy in the compounds, i.e., the
estimated concentration is AlB.Comment: LaTeX files and 4 eps figures, to be published in J. Phys. Soc. Jp
Intracameral bevacizumab and mitomycin C Trabeculectomy for eyes with neovascular glaucoma: a case series
The purpose of this study was to describe the surgical outcomes and safety of intracameral bevacizumab during trabeculectomy in eyes with neovascular glaucoma. Pilot study included four eyes (four patients) with refractory neovascular glaucoma submitted to fornix-based trabeculectomy with adjunctive use of bevacizumab in the anterior chamber during the procedure. Patients were previously treated with panretinal photocoagulation as standard therapy. Variables evaluated were intraocular pressure, bleb appearance, iris neovascularization, intraoperative/postoperative complications, and visual outcomes. No intraoperative complication was observed. The mean follow-up period was 12.75 (range, 12–15 months). All eyes showed significant intraocular pressure control postoperatively. Iris neovascularization reduced significantly within 1 month after surgery. Mild anterior chamber inflammation was observed during follow-up in all eyes. No significant postoperative complication was observed, and no patient presented visual acuity deterioration. Intracameral bevacizumab may be used as an adjunctive therapy during trabeculectomy in eyes with neovascular glaucoma
Trauma and Posttraumatic Stress Disorder (PTSD) in Patients with Schizophrenia or Schizoaffective Disorder
PHOTOEMISSION FROM THE DECAY OF SURFACE PLASMONS IN THIN FILMS OF Al
We have measured the yields and energy distributions of electrons generated by the decay of non-radiating surface plasmons in thin Al films. The films are evaporated onto the flat surface of a MgF2 semi-cylinder. Plasmons are generated at the vacuum interface of the film by light obliquely incident on the film through the substrate. Excitation of the plasmon modes occurs for a very narrow range of incident light angles. Reflection measurements as a function of angle show a sharp dip at this angle. Photoyields show a corresponding maximum as reported by Macek et al. [1]. Our measurements extend over a wider range of photon energies (4-10 eV) and include measurements of the energy distributions (EDC's) of both "on-peak" and "offpeak" photoemission. "On peak" EDC's are indistinguishable from those obtained with light incident on the film from the vacuum. "Off-peak" EDC's show an excess of low energy electrons. The results are accounted for in terms of the distribution of electric field intensities in the Al film
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