Driven frozen planet configuration in 2D helium
(by )
We report on frozen planet and asymmetric stretch
quantum states in planar helium. Under the action
of an electromagnetic field, some of these states mantain their strong
localization properties and long life times, and thus transform into
nondispersive two-electron wave packets.
Our ab initio quantum treatment combines
Floquet theory, complex dilation, and the representation
of the Hamiltonian in suitably chosen coordinates[1],
without adjustable parameters. It is equally well adapted to treat the
excitation and ionization of ground state atoms by optical fields as of
doubly excited Rydberg states under radiofrequency driving. The resulting
complex-symmetric, sparse banded generalized eigenvalue problem of
rather
high dimension is solved using advanced techniques of parallel
programming, on one of the largest parallel supercomputers, the Hitachi
SR8000-F1 at the Leibniz-Rechenzentrum of the Bavarian Academy of
Sciences.