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Related Experiment Video

Updated: Aug 26, 2025

Fabrication of Uniform Nanoscale Cavities via Silicon Direct Wafer Bonding

Fabrication of Uniform Nanoscale Cavities via Silicon Direct Wafer Bonding

Published on: January 9, 2014

Creating two-dimensional solid helium via diamond lattice confinement.

Weitong Lin¹, Yiran Li², Sytze de Graaf³

¹Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, China.

Nature Communications

|October 11, 2022

Summary

This summary is machine-generated.

Researchers discovered two-dimensional solid helium at room temperature using diamond lattice confinement. This breakthrough enables novel strain doping applications by manipulating helium

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Last Updated: Aug 26, 2025

Fabrication of Uniform Nanoscale Cavities via Silicon Direct Wafer Bonding

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Published on: January 9, 2014

An Externally-Heated Diamond Anvil Cell for Synthesis and Single-Crystal Elasticity Determination of Ice-VII at High Pressure-Temperature Conditions

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$Synthesis and Microdiffraction at Extreme Pressures and Temperatures$

Synthesis and Microdiffraction at Extreme Pressures and Temperatures

Published on: October 7, 2013

Area of Science:

Condensed Matter Physics
Materials Science
Quantum Mechanics

Background:

Solid helium exists in various forms in the universe, but terrestrial study requires extreme high-pressure conditions.
Understanding solid helium's allotropes is crucial for fundamental science.

Purpose of the Study:

To discover a method for producing and observing solid helium at room temperature and ambient pressure.
To investigate the structural and electronic properties of two-dimensional solid helium.
To explore potential applications of this novel material.

Main Methods:

Utilized controllable ion implantation to self-assemble helium monolayers within the {100} diamond lattice.
Employed advanced integrated differential phase contrast microscopy for structural analysis.
Investigated the electronic band structure modifications induced by the helium monolayers.

Main Results:

Successfully created room-temperature two-dimensional solid helium via diamond lattice confinement.
Observed a buckled tetragonal arrangement of anisotropic helium monolayers.
Demonstrated significant bandgap narrowing of the diamond lattice by up to ~2.2 electron volts due to helium-induced compressive strain.

Conclusions:

Diamond lattice confinement provides a novel pathway to synthesize and study solid helium under accessible conditions.
The unique structure of 2D solid helium induces substantial strain, leading to significant electronic property modifications.
This discovery opens avenues for intrinsic strain doping and advanced materials applications.