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Ultrasound-induced generation of multielectron bubbles in liquid helium

Yadav, N and Huang, Y and Ghosh, A (2020) Ultrasound-induced generation of multielectron bubbles in liquid helium. In: Physical Review B, 102 (5).

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Official URL: https://dx.doi.org/10.1103/PhysRevB.102.054509


Multielectron bubbles provide a unique platform to study electrons in two dimensions and on curved surfaces, at densities which cannot be accessed using electrons on bulk helium or in semiconductor interfaces. Usually, MEBs are created by applying a large electric field and thereby inducing electrohydrodynamical instability on a charged surface of liquid helium. In the present study, we describe a method to create instability of the charged surface using ultrasound, in the presence of small electric fields. The ultrasound was applied close to the charged liquid-vapor interface, resulting in the formation of a liquid column, which breaks into liquid droplets. The mechanical impact of the droplets falling back into the bulk liquid resulted in the formation of highly charged multielectron bubbles. We estimated the initial charge density of the bubbles above the lambda point to be close to 1013electrons/m2. © 2020 American Physical Society.

Item Type: Journal Article
Publication: Physical Review B
Publisher: American Physical Society
Additional Information: The copyright of this article belongs to American Physical Society
Keywords: Charged particles; Drops; Electric fields; Liquefied gases; Superfluid helium; Ultrasonics, Charged liquids; Charged surfaces; Curved surfaces; Electrohydrodynamical instability; Liquid droplets; Mechanical impacts; Multielectron bubbles; Semiconductor interfaces, Helium
Department/Centre: Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 11 Sep 2020 06:04
Last Modified: 11 Sep 2020 06:04
URI: http://eprints.iisc.ac.in/id/eprint/66481

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