68 research outputs found
Drift and Diffusion of Spins Generated by the Spin Hall Effect
Electrically generated spin accumulation due to the spin Hall effect is
imaged in n-GaAs channels using Kerr rotation microscopy, focusing on its
spatial distribution and time-averaged behavior in a magnetic field.
Spatially-resolved imaging reveals that spin accumulation observed in
transverse arms develops due to longitudinal drift of spin polarization
produced at the sample boundaries. One- and two-dimensional drift-diffusion
modeling is used to explain these features, providing a more complete
understanding of observations of spin accumulation and the spin Hall effect.Comment: 9 pages, 3 figure
Electrical control of spin coherence in ZnO
Electric field enhanced electron spin coherence is characterized using
time-resolved Faraday rotation spectroscopy in n-type ZnO epilayers grown by
molecular beam epitaxy. An in-plane dc electric field E almost doubles the
transverse spin lifetime at 20 K, without affecting the effective g-factor.
This effect persists till high temperatures, but decreases with increasing
carrier concentration. Comparisons of the variations in the spin lifetime, the
carrier recombination lifetime and photoluminescence lifetimes indicate that
the applied E enhances the radiative recombination rate. All observed effects
are independent of crystal directionality and are performed at low magnetic
fields (B < 0.2 T).Comment: 13 pages, 3 figure
Achieving a quantum smart workforce
Interest in building dedicated Quantum Information Science and Engineering
(QISE) education programs has greatly expanded in recent years. These programs
are inherently convergent, complex, often resource intensive and likely require
collaboration with a broad variety of stakeholders. In order to address this
combination of challenges, we have captured ideas from many members in the
community. This manuscript not only addresses policy makers and funding
agencies (both public and private and from the regional to the international
level) but also contains needs identified by industry leaders and discusses the
difficulties inherent in creating an inclusive QISE curriculum. We report on
the status of eighteen post-secondary education programs in QISE and provide
guidance for building new programs. Lastly, we encourage the development of a
comprehensive strategic plan for quantum education and workforce development as
a means to make the most of the ongoing substantial investments being made in
QISE.Comment: 18 pages, 2 figures, 1 tabl
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