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  3. The Rayleigh-taylor Instability In A Binary Quantum Fluid.
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  3. The Rayleigh-taylor Instability In A Binary Quantum Fluid.

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The Rayleigh-Taylor instability in a binary quantum fluid.

Yanda Geng1, Junheng Tao1, Mingshu Zhao1

  • 1Joint Quantum Institute, University of Maryland and National Institute of Standards and Technology, College Park, MD 20742, USA.

Science Advances
|August 27, 2025

View abstract on PubMed

Summary
This summary is machine-generated.

Researchers observed the Rayleigh-Taylor instability (RTI) in a quantum fluid for the first time. This quantum fluid instability mimics classical fluid behavior, revealing connections between classical and quantum fluid dynamics.

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Area of Science:

  • Quantum fluid dynamics
  • Bose-Einstein condensates
  • Fluid instabilities

Background:

  • Fluid instabilities, such as the Rayleigh-Taylor instability (RTI), are fundamental to structure formation in diverse fluid systems.
  • RTI is characterized by mushroom-shaped structures formed when immiscible fluids interact under acceleration.
  • Experimental observation of RTI is challenging, particularly in quantum systems.

Purpose of the Study:

  • To observe and characterize the Rayleigh-Taylor instability in a binary superfluid system.
  • To investigate the behavior of quantum fluids under conditions that induce RTI.
  • To explore the relationship between classical and quantum fluid instabilities.

Main Methods:

  • Utilized a two-component Bose-Einstein condensate as the immiscible binary superfluid.
  • Initiated the instability by forcing the two superfluid components together.
  • Employed spectroscopy to measure interface modes and matter-wave interferometry to analyze the superfluid velocity field.

    • Main Results:

    • Successfully observed mushroom-shaped structures characteristic of RTI in the superfluid system.
    • Demonstrated the stabilization of the fluid interface and measured 'ripplon' interface modes.
    • Transformed the superfluid velocity field into a vortex chain using matter-wave interferometry.

    Conclusions:

    • The study provides the first observation of RTI in a binary superfluid.
    • Results align with theoretical predictions, confirming the close analogy between classical and quantum fluid instabilities.
    • Highlights the potential of Bose-Einstein condensates as a platform for studying fundamental fluid dynamics.