Nanotechnology Now

Our NanoNews Digest Sponsors
Heifer International

Wikipedia Affiliate Button

Home > Press > The moiré patterns of three layers change the electronic properties of graphene

A graphene layer (black) of hexagonally arranged carbon atoms is placed between two layers of boron nitride atoms, which are also arranged hexagonally with a slightly different size. The overlap creates honeycomb patterns in various sizes.

CREDIT
Swiss Nanoscience Institute, University of Basel
A graphene layer (black) of hexagonally arranged carbon atoms is placed between two layers of boron nitride atoms, which are also arranged hexagonally with a slightly different size. The overlap creates honeycomb patterns in various sizes. CREDIT Swiss Nanoscience Institute, University of Basel

Abstract:
Combining an atomically thin graphene and a boron nitride layer at a slightly rotated angle changes their electrical properties. Physicists at the University of Basel have now shown for the first time the combination with a third layer can result in new material properties also in a three-layer sandwich of carbon and boron nitride. This significantly increases the number of potential synthetic materials, report the researchers in the scientific journal Nano Letters.

The moiré patterns of three layers change the electronic properties of graphene

Basel, Switzerland | Posted on March 8th, 2019

Last year, researchers in the US caused a big stir when they showed that rotating two stacked graphene layers by a "magical" angle of 1.1 degrees turns graphene superconducting - a striking example of how the combination of atomically thin materials can produce completely new electrical properties.

Precision alignment

Scientists from the Swiss Nanoscience Institute and the Department of Physics at the University of Basel have now taken this concept one step further. They placed a layer of graphene between two boron nitride layers, which is often serves to protect the sensitive carbon structure. Doing so, they aligned the layers very precisely with the crystal lattice of the graphene.

The effect observed by the physicists in Professor Christian Schönenberger's team is commonly known as a moiré pattern: when two regular patterns are superimposed, a new pattern results with a larger periodic lattice.

New three-layer superlattice

Lujun Wang, a member of the SNI PhD School and researcher in Schönenberger's team, also observed effects of this kind of superlattice when he combined layers of boron nitride and graphene. The atoms are arranged hexagonally in all layers. If they are stacked on top of each other, larger regular patterns emerge, with a size depending on the angle between the layers.

It had already been shown that this works with a two-layer combination of graphene and boron nitride, but the effects due to a second boron nitride layer had not yet been found.

When the physicists from Basel experimented with three layers, two superlattices were formed between the graphene and the upper and the lower boron nitride layer, respectively. The superposition of all three layers created an even larger superstructure than possible with only one layer.

Scientists are very interested in these types of synthetic materials, since the different moiré patterns can be used to change or artificially produce new electronic material properties.

"To put it simply, the atomic patterns determine the behavior of electrons in a material, and we are combining different naturally occurring patterns to create new synthetic materials," explains Dr. Andreas Baumgartner, who supervised the project. "Now we have discovered effects in these tailor-made electronic devices that are consistent with a three-layer superstructure," he adds.

####

For more information, please click here

Contacts:
Ylenia Sartorel


@UniBasel_en

Copyright © University of Basel

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

RELATED JOURNAL ARTICLE:

Related News Press

News and information

Machine learning speeds modeling of experiments aimed at capturing fusion energy on Earth May 17th, 2019

Manipulating atoms one at a time with an electron beam: New method could be useful for building quantum sensors and computers May 17th, 2019

New surface treatment could improve refrigeration efficiency: A slippery surface for liquids with very low surface tension promotes droplet formation, facilitating heat transfer May 17th, 2019

Generating high-quality single photons for quantum computing: New dual-cavity design emits more single photons that can carry quantum information at room temperature May 17th, 2019

CEA-Leti Develops CMOS Process for High-Performance MicroLEDs That Could Overcome Display-Size Obstacles: New Concept Creates All-in-One RGB MicroLEDs, Eliminates Several Transfer Steps to Receiving Substrate & Boosts Performance May 16th, 2019

Graphene/ Graphite

Manipulating atoms one at a time with an electron beam: New method could be useful for building quantum sensors and computers May 17th, 2019

ZEN gets $1m grant for graphene-enhanced concrete project May 12th, 2019

No ink needed for these graphene artworks: Artist employs Rice University lab's laser-induced graphene as medium for ultramodern art May 3rd, 2019

Videos/Movies

New way to beat the heat in electronics: Rice University lab's flexible insulator offers high strength and superior thermal conduction May 16th, 2019

2 Dimensional Materials

New way to beat the heat in electronics: Rice University lab's flexible insulator offers high strength and superior thermal conduction May 16th, 2019

2D insulators with ferromagnetism are rare; researchers just identified a new one May 10th, 2019

Computing faster with quasi-particles May 10th, 2019

Superconductivity

Manipulating superconductivity using a 'mechanic' and an 'electrician' May 10th, 2019

Possible Futures

Machine learning speeds modeling of experiments aimed at capturing fusion energy on Earth May 17th, 2019

Manipulating atoms one at a time with an electron beam: New method could be useful for building quantum sensors and computers May 17th, 2019

New surface treatment could improve refrigeration efficiency: A slippery surface for liquids with very low surface tension promotes droplet formation, facilitating heat transfer May 17th, 2019

Generating high-quality single photons for quantum computing: New dual-cavity design emits more single photons that can carry quantum information at room temperature May 17th, 2019

Chip Technology

Generating high-quality single photons for quantum computing: New dual-cavity design emits more single photons that can carry quantum information at room temperature May 17th, 2019

Skoltech researchers developed new perovskite-inspired semiconductors for electronic devices May 13th, 2019

2D insulators with ferromagnetism are rare; researchers just identified a new one May 10th, 2019

Computing faster with quasi-particles May 10th, 2019

Discoveries

Manipulating atoms one at a time with an electron beam: New method could be useful for building quantum sensors and computers May 17th, 2019

New surface treatment could improve refrigeration efficiency: A slippery surface for liquids with very low surface tension promotes droplet formation, facilitating heat transfer May 17th, 2019

Generating high-quality single photons for quantum computing: New dual-cavity design emits more single photons that can carry quantum information at room temperature May 17th, 2019

CEA-Leti Develops CMOS Process for High-Performance MicroLEDs That Could Overcome Display-Size Obstacles: New Concept Creates All-in-One RGB MicroLEDs, Eliminates Several Transfer Steps to Receiving Substrate & Boosts Performance May 16th, 2019

Announcements

Machine learning speeds modeling of experiments aimed at capturing fusion energy on Earth May 17th, 2019

Manipulating atoms one at a time with an electron beam: New method could be useful for building quantum sensors and computers May 17th, 2019

New surface treatment could improve refrigeration efficiency: A slippery surface for liquids with very low surface tension promotes droplet formation, facilitating heat transfer May 17th, 2019

Generating high-quality single photons for quantum computing: New dual-cavity design emits more single photons that can carry quantum information at room temperature May 17th, 2019

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers

Machine learning speeds modeling of experiments aimed at capturing fusion energy on Earth May 17th, 2019

Manipulating atoms one at a time with an electron beam: New method could be useful for building quantum sensors and computers May 17th, 2019

Generating high-quality single photons for quantum computing: New dual-cavity design emits more single photons that can carry quantum information at room temperature May 17th, 2019

New way to beat the heat in electronics: Rice University lab's flexible insulator offers high strength and superior thermal conduction May 16th, 2019

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project