Abstract
Confined quantum systems, particles or systems of particles that have their movements limited to a determined region of the space, have received attention since the beginning from the Quantum Theory. The physical and chemical properties of confined objects are modified with respect to free objects such as due the spatial confinement as to other factors as, for example, the electromagnetic field, not saturated chemical bounds, etc. In recent years, the interest in this area has grown sufficiently due the great set of phenomena and physical processes which can be characterized or be understood as confined quantum systems and that have various technological applications. The confined quantum systems are important, for example, in the embedding of atoms and molecules inside cavities such as zeolite molecular sieves, fullerenes, or solvent environments; in bubbles formed around foreign objects in the liquid helium or neutral plasma; in semiconductors structures in the mesoscopic-scale, as artificial atoms and molecules, or quantum dots; in atoms under pressure that are important for the agreement of the interior of planets, among others. Thus, different theoretical and computational methodologies have been used to study confined quantum systems. In particular, methods based on the variational formalism that expand the wave function in a set of basis functions as, for example, the discrete variable representation and the finite element method have been used successfully to treat systems with few electrons. In the present work our major aim is to present a review of applications of this class of methods to study typical confined quantum systems as the hydrogen atom and the two electron quantum dot, discussing the advantages and disadvantages of each one of them.
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Notes
- 1.
Note that for a repulsive spherical cage the natural position of an atom is in the center, but for attractive potentials, this is not a general situation. However, even if the atom is off-center, it is reasonable first solve the problem with spherical symmetry, and then develop expansions that represent the effect of the displacement of the atom to some other position. Similarly, the surface of confinement need not be spherical, however, it is reasonable to start with a sphere, then consider how the system is modified by the distortion of the confining surface.
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Acknowledgments
This work has been supported by the following Brazilian National Research Councils: Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Fundação de Amparo à Pesquisa do Estado da Bahia (FAPESB) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES).
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Prudente, F.V., Guimarães, M.N. (2014). Confined Quantum Systems Using the Finite Element and Discrete Variable Representation Methods. In: Sen, K. (eds) Electronic Structure of Quantum Confined Atoms and Molecules. Springer, Cham. https://doi.org/10.1007/978-3-319-09982-8_5
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