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Observation of self-binding in monolayer 3He.

D Sato¹, K Naruse, T Matsui

¹Department of Physics, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Tokyo 113-0033, Japan.

Physical Review Letters

|February 2, 2013

Summary

Researchers observed an unexpected gas-liquid transition in helium-3 (³He) on graphite. This quantum liquid state forms at the lowest density ever recorded, challenging previous theories about two-dimensional quantum gases.

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Area of Science:

Low-temperature physics
Quantum fluids
Surface science

Background:

The behavior of quantum gases at low temperatures is a fundamental area of condensed matter physics.
Previous theories predicted dilute gas behavior for helium-3 (³He) in two dimensions.

Purpose of the Study:

To experimentally investigate the phase behavior of ³He adsorbed on graphite.
To determine the ground state properties of monolayer ³He systems.

Main Methods:

Measurements of the gamma coefficient of heat capacity in the degenerate region (2-80 mK).
Analysis of the linear density dependence of heat capacity to infer phase transitions.
Studying the first three monolayer systems of ³He adsorbed on graphite.

Main Results:

Observed clear experimental signatures of a gas-liquid transition in monolayer ³He systems.
The transition occurred below a critical liquid density (ρ(c0)) of 0.6-0.9 nm⁻².
This critical density was surprisingly consistent across different layers despite varying environments.

Conclusions:

The ground state of 2D ³He is not a dilute quantum gas but a self-bound quantum liquid.
This finding represents the lowest density quantum liquid observed to date.
The experimental results contradict theoretical expectations for 2D quantum systems.