5,065 research outputs found
Mott-Superfluid Transition for Spin-Orbit Coupled Bosons in One-Dimensional Optical Lattices
We study the effects of spin-orbit coupling on the Mott-superfluid transition
of bosons in a one-dimensional optical lattice. We determine the strong
coupling magnetic phase diagram by a combination of exact analytic and
numerical means. Smooth evolution of the magnetic structure into the superfluid
phases are investigated with the density matrix renormalization group
technique. Novel magnetic phases are uncovered and phase transitions between
them within the superfluid regime are discussed. Possible experimental
detection are discussed.Comment: 5 pages, 4 figure
Direct investment: a doubtful alternative to international debt
The paper considers a model in which private foreign investors make direct long-lived capital investments in a small developing country that is subject to stochastic shocks to production. Depending upon the preferences of the host country, we find that expropriation can occur because of either desperation or opportunism. We show that under reasonable assumptions, increased investment makes expropriation less likely to occur and that the level of investment chosen by atomistic foreign investors may be nonoptimal.International finance ; Developing countries
Effects of large induced superconducting gap on semiconductor Majorana nanowires
With the recent achievement of extremely high-quality epitaxial interfaces
between InAs nanowires and superconducting Al shells with strong
superconductor-semiconductor tunnel coupling, a new regime of proximity-induced
superconductivity in semiconductors can be explored where the induced gap may
be similar in value to the bulk Al gap (large gap) with negligible subgap
conductance (hard gap). We propose several experimentally relevant consequences
of this large-gap strong-coupling regime for tunneling experiments, and we
comment on the prospects of this regime for topological superconductivity. In
particular, we show that the advantages of having a strong spin-orbit coupling
and a large spin g-factor in the semiconductor nanowire may both be compromised
in this strongly coupled limit, and somewhat weaker interface tunneling may be
necessary for achieving optimal proximity superconductivity in the
semiconductor nanowire. We derive a minimal, generic theory for the
strong-coupling hard-gap regime obtaining good qualitative agreement with the
experiment and pointing out future directions for further progress toward
Majorana nanowires in hybrid semiconductor-superconductor structures.Comment: 8 pages, 5 figures; published versio
Solar PhotoVoltaic
The New Hampshire National Guard Training Site located in Strafford, New Hampshire plans to utilize renewable energy to meet the goal of becoming a net zero facility by 2030 for electrical consumption in accordance with the American Institute of Architects 2030 net zero initiative. In order to be considered a net zero facility, all energy consumed would have to be offset by energy supplied by renewable sources. William selected this project because it had some really good lessons learned early on in the project that really helped shape his view of his role as a project manager. Williams’s major takeaway from this project is that communication is king. There was some rough going early on in the project but once the team ironed out their communication things really turned around and the project hit all the milestones and finished on time
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