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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

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Published on: August 2, 2019

Hybrid Sound Modes in One-Dimensional Quantum Liquids.

K A Matveev¹, A V Andreev²

¹Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.

Physical Review Letters

|August 8, 2018

Summary

This summary is machine-generated.

We discovered two sound modes in one-dimensional quantum liquids, unlike classical fluids. These hybrid sound modes, combining density and entropy oscillations, propagate at nearly equal speeds, differing linearly with temperature.

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Area of Science:

Condensed Matter Physics
Quantum Fluids
Acoustics

Background:

Classical fluids exhibit a single sound mode.
Quantum liquids possess unique collective excitations.
Understanding sound propagation in low dimensions is crucial.

Purpose of the Study:

Investigate sound propagation in a one-dimensional quantum liquid.
Identify and characterize distinct sound modes.
Analyze the temperature dependence of sound speeds.

Main Methods:

Theoretical study of a single-channel one-dimensional quantum liquid.
Analysis of density oscillations.
Examination of hybrid modes combining first and second sound properties.

Main Results:

Identified two distinct sound modes instead of one.
Observed that the two sound speeds are nearly equal.
Found the speed difference scales linearly with temperature.

Conclusions:

Quantum liquids exhibit complex acoustic behavior beyond classical predictions.
Two hybrid sound modes, involving density and entropy, are present.
Temperature plays a key role in differentiating sound mode velocities.