102,826 research outputs found
High harmonic generation in crystals using Maximally Localized Wannier functions
In this work, the nonlinear optical response, and in particular, the high
harmonic generation of semiconductors is addressed by using the Wannier gauge.
One of the main problems in the time evolution of the Semiconductor Bloch
equations resides in the fact that the dipole couplings between different bands
can diverge and have a random phase along the reciprocal space and this leads
to numerical instability. To address this problem, we propose the use of the
Maximally Localized Wannier functions that provide a framework to map ab-initio
calculations to an effective tight-binding Hamiltonian with great accuracy. We
show that working in the Wannier gauge, the basis set in which the Bloch
functions are constructed directly from the Wannier functions, the dipole
couplings become smooth along the reciprocal space thus avoiding the problem of
random phases. High harmonic generation spectrum is computed for a 2D monolayer
of hBN as a numerical demonstration
Effects of quantum deformation on the spin-1/2 Aharonov-Bohm problem
In this letter we study the Aharonov-Bohm problem for a spin-1/2 particle in
the quantum deformed framework generated by the -Poincar\'{e}-Hopf
algebra. We consider the nonrelativistic limit of the -deformed Dirac
equation and use the spin-dependent term to impose an upper bound on the
magnitude of the deformation parameter . By using the self-adjoint
extension approach, we examine the scattering and bound state scenarios. After
obtaining the scattering phase shift and the -matrix, the bound states
energies are obtained by analyzing the pole structure of the latter. Using a
recently developed general regularization prescription [Phys. Rev. D.
\textbf{85}, 041701(R) (2012)], the self-adjoint extension parameter is
determined in terms of the physics of the problem. For last, we analyze the
problem of helicity conservation.Comment: 12 pages, no figures, submitted for publicatio
The Challenges of Strategic Human Resources Management in Southeast Asian Universities
Nowadays the Higher Education Institutions face major challenges in its development.
Demanding from different actors and the orientation of the research, more oriented to
innovation and value creation, request news capacities to answer to that.
Southeast Asia shows a strong economic growth with a large increase in GDP and a
growing improvement in the position of The Human Development Index promoted by United
Nations.
This reality creates a different pressure on the higher education institutions in southeast Asia
that requires a change in the universities, in the way they implement the mission and in the
requested capacities, specially the human resources capacities.
In this way, a new paradigm and model of human resources management for southeast
higher education institutions need be developed to create the conditions to answer to this
new reality, where the main analysis variables will be talent, performance, motivation and
retention, coaching, cross cultural, integrity and permanent adaptability and flexibility.
The main objective of this communication is to reflect and contextualize in terms of
theoretical models where we find the assumptions for the implementation of strategic human
resources management for southeast Asian universities.
What kind of profile is request for the staff in this new reality?
What we need to change in human resources management?
How can this change be implemented?
What HRM tools are most relevant to this reality?
These are the main issues on which we will reflect with a critical thinking approach in order
to present a set of clues to southeast Asian universities according to our analysis and
interpretation, as Portuguese and European
Particle deposition onto a flat plate with various slopes
In this work, a numerical simulation of the deposition of small suspended particles onto a flat plate with various degrees of inclination is performed. The particle deposition rates are obtained for various Reynolds and Rayleigh number groups
Remarks on the Aharonov-Casher dynamics in a CPT-odd Lorentz-violating background
The Aharonov-Casher problem in the presence of a Lorentz-violating background
nonminimally coupled to a spinor and a gauge field is examined. Using an
approach based on the self-adjoint extension method, an expression for the
bound state energies is obtained in terms of the physics of the problem by
determining the self-adjoint extension parameter.Comment: Matches published versio
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