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Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System

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Novel methods to create multielectron bubbles in superfluid helium.

J Fang¹, Anatoly E Dementyev, J Tempere

¹Lyman Laboratory of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.

The Review of Scientific Instruments

|April 5, 2011

Summary

This summary is machine-generated.

Researchers explored multielectron bubbles (MEBs) in liquid helium, revealing insights into their creation and discharge mechanisms. A novel extraction method allows for further study of these unique electron gas structures.

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Area of Science:

Condensed matter physics
Quantum fluids

Background:

Multielectron bubbles (MEBs) in liquid helium are intriguing systems featuring a spherical two-dimensional electron gas.
Understanding MEB stability and creation is crucial for exploring their unique quantum properties.

Purpose of the Study:

To investigate two distinct methods of creating multielectron bubbles in liquid helium.
To analyze the discharge mechanisms of MEBs in a cylindrical cell.
To develop a novel method for extracting and studying MEBs.

Main Methods:

Analytical investigation of MEB discharge via tunneling.
Experimental extraction of MEBs from a vapor sheath using high electric fields (up to 15 kV/cm).
High-speed video photography and charge measurement of extracted MEBs.

Main Results:

Analytical explanation for the short lifetime of MEBs in a cylindrical cell due to tunneling discharge.
Successful extraction of MEBs using a novel electric field method.
Measurement of significant charges (up to 1.6x10^-9 C, ~10^10 electrons) on extracted MEBs.

Conclusions:

Tunneling is identified as a key discharge mechanism for certain MEB configurations.
A new experimental technique enables the capture and study of high-charge MEBs.
This method opens avenues for detailed investigation of MEB properties in electromagnetic traps.