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7 papers · 2 filters
Wannier threshold law for two electron escape in the presence of an external electric field
Bruno Eckhardt, Krzysztof Sacha
We consider double ionization of atoms or ions by electron impact in the presence of a static electric field. As in Wanniers analysis of the analogous situation without external fi…
Mean field loops versus quantum anti-crossing nets in trapped Bose-Einstein condensates
Zbyszek P. Karkuszewski, Krzysztof Sacha, Augusto Smerzi
We study a Bose-Einstein condensate trapped in an asymmetric double well potential. Solutions of the time-independent Gross-Pitaevskii equation reveal intrinsic loops in the energy…
Non-sequential triple ionization in strong fields
Krzysztof Sacha, Bruno Eckhardt
We consider the final stage of triple ionization of atoms in a strong linearly polarized laser field. We propose that for intensities below the saturation value for triple ionizati…
Conditional quantum dynamics with several observers
Jacek Dziarmaga, Diego A. R. Dalvit, Wojciech H. Zurek
We consider several observers who monitor different parts of the environment of a single quantum system and use their data to deduce its state. We derive a set of conditional stoch…
Simple method for excitation of a Bose-Einstein condensate
Bogdan Damski, Zbyszek P. Karkuszewski, Krzysztof Sacha +1
An appropriate, time-dependent modification of the trapping potential may be sufficient to create effectively collective excitations in a cold atom Bose-Einstein condensate. The pr…
A method for collective excitation of Bose-Einstein condensate
Zbyszek P. Karkuszewski, Krzysztof Sacha, Jakub Zakrzewski
It is shown that by an appropriate modification of the trapping potential one may create collective excitation in cold atom Bose-Einstein condensate. The proposed method is complem…