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{\Large \bf Rapid ion cooling via switching spin statistics}
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{\large M.~Bonitz$^a$, D.~Semkat$^a$, M.S.~Murillo$^b$, and D.O.~Gericke$^b$}
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$^a$ Universit\"{a}t Rostock, Fachbereich Physik, Universit\"{a}tsplatz 3,\\
D--18051 Rostock\\
$^b$ Theoretical Division, Los Alamos National Laboratory,\\
Los Alamos, New Mexico 87545
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\centerline{\large Abstract}
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Recent experimental progress in the field of ultracold atoms and ions [1,2] has
lead to an increasing interest in the theoretical understanding of many-body
systems at very low temperatures, where quantum effects play a crucial role.
Conventional cooling techniques, such as evaporative or laser cooling are
relatively slow (i.e., they act on hydrodynamic time scales), and, in the case
of fermionic particles, are hampered by Pauli blocking. Therefore, new concepts
to further decrease the temperatures are in demand. 

We demonstrate a novel approach for cooling trapped ions to nanoKelvin
temperatures where the cooling mechanism acts on a short time scale determined
by the relaxation of the pair distribution. We show that after the ionization
of fermionic atoms the ion ensemble undergoes a gradual transition from Fermi
to Bose statistics. The large amount of (negative) exchange energy immediately
after ionization corresponds to an overcorrelated state, and thus causes rapid
cooling [3].

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\noindent [1] B.~DeMarco, D.S.~Jin, Science {\bf 285}, 1703 (1999).

\noindent [2] T.C.~Kilian {\it et al.}, Phys. Rev. Lett. {\bf 83}, 4776 (1999).

\noindent [3] D. Semkat, M. Bonitz, D. Kremp, M.S. Murillo, and D.O. Gericke,

\hspace{-0.8ex} poster at this workshop.

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