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- Forschungszentrum JülichDE94 papers
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43 papers · 1 filter
Ellipsoidal Coulomb Crystals in a Linear Radiofrequency Trap
U. Fröhlich, B. Roth, S. Schiller
A static quadrupole potential breaks the cylindrical symmetry of the effective potential of a linear rf trap. For a one-component fluid plasma at low temperature, the resulting equ…
Sympathetic cooling of He ions in a radiofrequency trap
B. Roth, U. Fröhlich, S. Schiller
We have generated Coulomb crystals of ultracold He ions in a linear radiofrequency trap, by sympathetic cooling via laser--cooled Be. Stable crystals containing up…
Three-body problem for ultracold atoms in quasi-one-dimensional traps
C. Mora, R. Egger, A. O. Gogolin
We study the three-body problem for both fermionic and bosonic cold atom gases in a parabolic transverse trap of lengthscale . For this quasi-one-dimensional (1D) problem,…
Spectroscopy of a driven solid-state qubit coupled to a structured environment
M. C. Goorden, M. Thorwart, M. Grifoni
We study the asymptotic dynamics of a driven spin-boson system where the environment is formed by a broadened localized mode. Upon exploiting an exact mapping, an equivalent formul…
Engel-like characterization of radicals in finite dimensional Lie algebras and finite groups
Tatiana Bandman, Mikhail Borovoi, Fritz Grunewald +2
A classical theorem of R. Baer describes the nilpotent radical of a finite group G as the set of all Engel elements, i.e. elements y in G such that for any x in G the n-th commutat…
Shape resonances for ultracold atom gases in carbon nanotube waveguides
V. Peano, M. Thorwart, C. Mora +1
We propose an experimentally viable setup for the realization of one-dimensional ultracold atom gases in a nanoscale magnetic waveguide formed by two doubly-clamped suspended carbo…