11,534 research outputs found
Standard Embeddings of Smooth Schubert Varieties in Rational Homogeneous Manifolds of Picard Number 1
Smooth Schubert varieties in rational homogeneous manifolds of Picard number
1 are horospherical varieties. We characterize standard embeddings of smooth
Schubert varieties in rational homogeneous manifolds of Picard number 1 by
means of varieties of minimal rational tangents. In particular, we mainly
consider nonhomogeneous smooth Schubert varieties in symplectic Grassmannians
and in the 20-dimensional -homogeneous manifold associated to a short
simple root.Comment: 22 page
What are the Key Factors in Managing Diversity and Inclusion Successfully in Large International Organizations?
Question: What are the key factors in managing diversity and inclusion successfully in large international organizations? Which companies are best in class and what does that entail
On the anomaly of nonlocal symmetry in the chiral QED
We show that the anomaly of nonlocal symmetry can be canceled by the
well-known Wess-Zumino acton which cancels the gauge anomaly in the
two-dimensional chiral electrodynamics.Comment: 4 pages, latex, no figure
Entropy in the Kerr-Newman Black Hole
Entropy of the Kerr-Newman black hole is calculated via the brick wall method
with maintaining careful attention to the contribution of superradiant scalar
modes. It turns out that the nonsuperradinat and superradiant modes
simultaneously contribute to the entropy with the same order in terms of the
brick wall cutoff . In particular, the contribution of the
superradiant modes to the entropy is negative. To avoid divergency in this
method when the angular velocity tends to zero, we propose to intr oduce a
lower bound of angular velocity and to treat the case of the angular momentum
per unit mass separately. Moreover, from the lower bound of the angular
velocity, we obtain the -dependence structure of the brick wall cutoff,
which natu rally requires an angular cutoff . Finally, if the cutoff
values, and , satisfy a proper relation between them, the
resulting entropy satisfies the area law.Comment: 16 pages, Latex, no figures, References are included, Subsection A
and B are reduced to subsection A, Abstract is rewritten, Minor corrections
are include
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Optically pumped colloidal-quantum-dot lasing in LED-like devices with an integrated optical cavity.
Realization of electrically pumped lasing with solution processable materials will have a revolutionary impact on many disciplines including photonics, chemical sensing, and medical diagnostics. Due to readily tunable, size-controlled emission wavelengths, colloidal semiconductor quantum dots (QDs) are attractive materials for attaining this goal. Here we use specially engineered QDs to demonstrate devices that operate as both a light emitting diode (LED) and an optically pumped laser. These structures feature a distributed feedback resonator integrated into a bottom LED electrode. By carefully engineering a refractive-index profile across the device, we are able to obtain good confinement of a waveguided mode within the QD medium, which allows for demonstrating low-threshold lasing even with an ultrathin (about three QD monolayers) active layer. These devices also exhibit strong electroluminescence (EL) under electrical pumping. The conducted studies suggest that the demonstrated dual-function (lasing/EL) structures represent a promising device platform for realizing colloidal QD laser diodes
A Contagion through Exposure to Foreign Banks during the Global Financial Crisis
Although the global financial crisis of 2008 took root in the advanced countries, its shocks spread through the emerging economies, reflecting the increasingly interconnected global financial system. This paper develops an empirical methodology to test the contagion effect at the country level using bilateral data on bank claims between countries. It measures the direct and indirect exposures of emerging economies to crisis countries and tests whether these matter for capital outflows from emerging economies. The paper measures these exposures to the crisis-affected countries by using bilateral foreign claims sourced from Bank for International Settlements (i) consolidated banking statistics foreign claims on immediate counterparty and ultimate risk bases and (ii) locational banking statistics cross-border total claims. Findings show that emerging market economies more exposed directly or indirectly to banks in the crisis-affected countries suffered more capital outflows during the global financial crisis
Electrical Investigation of the Oblique Hanle Effect in Ferromagnet/Oxide/Semiconductor Contacts
We have investigated the electrical Hanle effect with magnetic fields applied
at an oblique angle ({\theta}) to the spin direction (the oblique Hanle effect,
OHE) in CoFe/MgO/semiconductor (SC) contacts by employing a three-terminal
measurement scheme. The electrical oblique Hanle signals obtained in
CoFe/MgO/Si and CoFe/MgO/Ge contacts show clearly different line shapes
depending on the spin lifetime of the host SC. Notably, at moderate magnetic
fields, the asymptotic values of the oblique Hanle signals (in both contacts)
are consistently reduced by a factor of cos^2({\theta}) irrespective of the
bias current and temperature. These results are in good agreement with
predictions of the spin precession and relaxation model for the electrical
oblique Hanle effect. At high magnetic fields where the magnetization of CoFe
is significantly tilted from the film plane to the magnetic field direction, we
find that the observed angular dependence of voltage signals in the CoFe/MgO/Si
and CoFe/MgO/Ge contacts are well explained by the OHE, considering the
misalignment angle between the external magnetic field and the magnetization of
CoFe.Comment: 19 pages, 8 figure
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