Novel Methods to Create Multielectron Bubbles in Superfluid Helium

Details Novel Methods to Create Multielectron Bubbles in Superfluid Helium Novel Methods to Create Multielectron Bubbles in Superfluid Helium

2009-10-16

arxiv.org/abs/0910.3224v1

Physics

Condensed Matter

Other Condensed Matter

19 pages; 7 figures

Scientific paper

An equilibrium multielectron bubble in liquid helium is a fascinating object with a spherical two-dimensional electron gas on its surface. We describe two ways of creating them. MEBs have been observed in the dome of a cylindrical cell with an unexpectedly short lifetime; we show analytically why these MEBs can discharge by tunneling. Using a novel method, MEBs have been extracted from a vapor sheath around a hot filament in superfluid helium by applying electric fields up to 15 kV/cm, and photographed with high-speed video. Charges as high as 1.6x10-9 C (~1010 electrons) have been measured. The latter method provides a means of capture in an electromagnetic trap to allow the study of the extensive exciting properties of these elusive objects.

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