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In the present paper we investigate the influence of measurements on thequantum dynamics of degenerate Bose atoms gases in a symmetric double-well. Weshow that continuous measurements enhance asymmetry on the density distributionof the atoms and broaden the parameter regime for self-trapping. We term thisphenomenon as nonlinear quantum Zeno effect in analog to the celebrated Zenoeffect in a linear quantum system. Under discontinuous measurements, theself-trapping due to the atomic interaction in the degenerate bosons is shownto be destroyed completely. Underlying physics is revealed and possibleexperimental realization is discussed.Comment: 8 pages, 8 figure

Continuous-measurement-enhanced self-trapping of degenerate ultracold atoms in a double well: Nonlinear quantum Zeno effect