Selected aspects of the quantum dynamics and electronic structure of atoms in magnetic microtraps |
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Authors: | Email author" target="_blank">I?LesanovskyEmail author P?Schmelcher |
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Institution: | (1) Physikalisches Institut, Universität Heidelberg, Philosophenweg 12, 69120 Heidelberg, Germany;(2) Theoretische Chemie, Institut für Physikalische Chemie, Universität Heidelberg, INF 229, 69120 Heidelberg, Germany |
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Abstract: | We analyze the quantum properties of atoms in a magnetic
quadrupole field. The quantum dynamics of ground state atoms in
this field configuration is studied firstly. We formulate the
Hamiltonian and perform a symmetry analysis. Due to the particular
shape of the quadrupole field in general there exist no stable
states. We provide resonance energies, lifetimes and calculate the
density of states and investigate under what conditions
quasi-bound states occur that possess long lifetimes. An effective
scalar Schrödinger equation describing such states is derived.
As a next step we explore the influence of a high gradient
quadrupole field on the electronic structure of excited atoms. An
effective one-body approach together with the fixed nucleus
approximation is employed in order to derive the electronic
Hamiltonian. We present the energy spectrum and discuss peculiar
features such as non-trivial spin densities and magnetic field
induced electric dipole moments. |
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Keywords: | |
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