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Primeur weekly 2019-04-15

Quantum computing

U.S. research team expands quantum network with successful long-distance entanglement experiment ...

2D gold quantum dots are atomically tunable with nanotubes ...

New algorithm optimizes quantum computing problem-solving ...

Brookhaven joins the IBM Q Network Hub at Oak Ridge National Lab ...

Focus on Europe

Taurus Group acquires HPC specialist ClusterVision, broadening its global value-added strategy ...

eInfraCentral calls for participation to EOSC community event on June 20, 2019 ...

A significant European supercomputing grant to nanoscience researchers for investigations of atomically precise nanocatalysts ...

WekaIO expands AI and HPC storage solutions in Central Europe ...

Exscalate helps Epidemics research ...

Middleware

Spectra announces new data mover for BlackPearl solution and certifies more BlackPearl clients ...

Hardware

Cray supercomputers to feature new Intel Xeon Scalable processors ...

Supermicro introduces over 100 resource-saving server and storage systems with new 2nd generation Intel Xeon Scalable processors ...

Spectra Logic announces new tape features and functionality, setting the standard for tape innovation ...

Fujitsu begins production of Post-K ...

Intel Optane technology and Intel QLC NAND technology come together on a single drive ...

Largest, fastest array of microscopic 'traffic cops' for optical communications ...

Applications

Melissa Cragin joins SDSC's Research Data Services Group ...

NVIDIA and American College of Radiology AI-LAB team to accelerate adoption of AI in diagnostic radiology across thousands of hospitals ...

TACC's supercomputers play role in Event Horizon Telescope's first-ever black hole image ...

ATOM Consortium combines forces with NVIDIA to accelerate AI in drug discovery ...

The Cloud

SDSC's Phylogenetics Science Gateway awarded NSF/Internet2 grant ...

HPE and Nutanix sign global agreement to deliver hybrid Cloud as a Service ...

HPE and Google Cloud partner to simplify hybrid Cloud ...

Atos announces Open Hybrid Cloud solution enabling enterprises to move to Google Cloud ...

Atos and CloudBees partner to provide modern application development on Google Cloud ...

Intel and Google Cloud announce strategic partnership to accelerate hybrid Cloud ...

Scientific computing in the Cloud gets down to Earth ...

2D gold quantum dots are atomically tunable with nanotubes


Yoke Khin Yap.
11 Apr 2019 Houghton - Two-dimensional (2D) semiconductors are promising for quantum computing and future electronics. Now, researchers can convert metallic gold into semiconductor and customize the material atom-by-atom on boron nitride nanotubes.

Gold is a conductive material already widely used as interconnects in electronic devices. As electronics have gotten smaller and more powerful, the semiconducting materials involved have also shrunk. However, computers have gotten about as small as they can with existing designs - to break the barrier, researchers dive into the physics underlying quantum computing and the unusual behaviours of gold in quantum mechanics.

Researchers can convert gold into semiconducting quantum dots made of a single layer of atoms. Their energy gap, or bandgap, is formed by the quantum confinement - a quantum effect when materials behave like atoms as their sizes get so small approaching the molecular scale. These 2D gold quantum dots can be used for electronics with a bandgap that is tunable atom-by-atom.

Making the dots with monolayer of atoms is tricky and the bigger challenge is customizing their properties. When laid out on boron nitride nanotubes, researchers from Michigan Technological University have found that they can get gold quantum dots to do the near-impossible. The mechanisms behind getting gold dots to clump atom-by-atom is the focus of their new paper, recently published in ACS Nano .

Yoke Khin Yap, professor of physics at Michigan Tech, led the study. He explains that the behavior his team observed - atomic-level manipulation of gold quantum dots - can be seen with a scanning transmission electron microscope (STEM). The STEM's high-powered beam of electrons enables researchers like Yap to watch atomic movement in real-time and the view reveals how gold atoms interact with the surface of boron nitride nanotubes. Basically, the gold atoms glide along the surface of the nanotubes and, they stabilize in a hover just above the hexagon honeycomb of the boron nitride nanotubes.

The atomic skiing and stopping is related to the so-called energy selective deposition. In the lab, the team takes an array of boron nitride nanotubes and runs a gold-laden mist past it; the gold atoms in the mist either stick as multilayered nanoparticles or bounce off the nanotube, but some of the more energetic ones glide along the circumference of the nanotube and stabilize, then start to clump into monolayers of gold quantum dots. The team shows that gold preferentially deposits behind other gold particles that have stabilized.

"The surface of boron nitride nanotubes are atomically smooth, there are no defects on the surface, it's a neatly arranged honeycomb", Yoke Khin Yap stated, adding that the nanotubes are chemically inert and there is no physical bond between the nanotubes and gold atoms. "It's much like skiing: You can't ski on a bumpy and sticky hill with no snow, ideal conditions make it much better. The smooth surface of the nanotubes is like fresh powder."

The search for new materials for future electronics and quantum computing has led researchers down many paths. Yap hopes that by demonstrating the effectiveness of gold, other researchers will be inspired to pay attention to other metal monolayers at the molecular-scale.

"This is a dream nanotechnology", Yoke Khin Yap stated. "It is a molecular-scale technology tunable by atom with an ideal bandgap in the visible light spectra. There is a lot of promise in electronic and optical devices."

The team's next steps include further characterization and incorporating device fabrication to demonstrate all-metal electronics. Potentially, monolayers of metal atoms could make up the entirety of future electronics, which will save a lot of manufacturing energy and materials.

This work was performed in collaboration Ravindra Pandey, professor of physics at Michigan tech, whose team contributed the theoretical model, and Juan-Carlos Idrobo, scientist at the Center for Nanophase Materials Sciences at Oak Ridge National Laboratory.

Gold atoms ski along the surface of boron nitride nanotubes. Better understanding this phenomena, using detailed atomic images from a scanning electron microscope (STEM), could help physicists, materials scientists, and computer engineers develop better computers, cell phones, wearable devices, and other electronics. Credit: Nicole Kelly/Michigan Tech.

Source: Michigan Technological University

Back to Table of contents

Primeur weekly 2019-04-15

Quantum computing

U.S. research team expands quantum network with successful long-distance entanglement experiment ...

2D gold quantum dots are atomically tunable with nanotubes ...

New algorithm optimizes quantum computing problem-solving ...

Brookhaven joins the IBM Q Network Hub at Oak Ridge National Lab ...

Focus on Europe

Taurus Group acquires HPC specialist ClusterVision, broadening its global value-added strategy ...

eInfraCentral calls for participation to EOSC community event on June 20, 2019 ...

A significant European supercomputing grant to nanoscience researchers for investigations of atomically precise nanocatalysts ...

WekaIO expands AI and HPC storage solutions in Central Europe ...

Exscalate helps Epidemics research ...

Middleware

Spectra announces new data mover for BlackPearl solution and certifies more BlackPearl clients ...

Hardware

Cray supercomputers to feature new Intel Xeon Scalable processors ...

Supermicro introduces over 100 resource-saving server and storage systems with new 2nd generation Intel Xeon Scalable processors ...

Spectra Logic announces new tape features and functionality, setting the standard for tape innovation ...

Fujitsu begins production of Post-K ...

Intel Optane technology and Intel QLC NAND technology come together on a single drive ...

Largest, fastest array of microscopic 'traffic cops' for optical communications ...

Applications

Melissa Cragin joins SDSC's Research Data Services Group ...

NVIDIA and American College of Radiology AI-LAB team to accelerate adoption of AI in diagnostic radiology across thousands of hospitals ...

TACC's supercomputers play role in Event Horizon Telescope's first-ever black hole image ...

ATOM Consortium combines forces with NVIDIA to accelerate AI in drug discovery ...

The Cloud

SDSC's Phylogenetics Science Gateway awarded NSF/Internet2 grant ...

HPE and Nutanix sign global agreement to deliver hybrid Cloud as a Service ...

HPE and Google Cloud partner to simplify hybrid Cloud ...

Atos announces Open Hybrid Cloud solution enabling enterprises to move to Google Cloud ...

Atos and CloudBees partner to provide modern application development on Google Cloud ...

Intel and Google Cloud announce strategic partnership to accelerate hybrid Cloud ...

Scientific computing in the Cloud gets down to Earth ...