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Primeur weekly 2020-02-10

Exascale supercomputing

Tachyum's reference design will be used in a 2021 AI/HPC supercomputer ...

Quantum computing

Forschungszentrum Jülich to establish technology laboratory for quantum computers ...

FEFU scientists developed method to build up functional elements of quantum computers ...

New quantum switch turns metals into insulators ...

Focus on Europe

International Advanced Research Workshop on High Performance Computing to issue Call for Participation ...

EPSRC appoints Mark Parsons Director of Research Computing ...

e-IRG Workshop "Grand challenges of e-Infrastructures within the new ERA" to issue Call for Participation ...

BigDFT4CHEM wins the EXDCI Call for Spin-off Initiatives (SPI) ...

Eni unveils its new supercomputing system HPC5, the world's most powerful for industrial use ...

Tachyum CEO Dr. Radoslav Danilak discusses 'Bringing Slovakia to the Forefront of the Digital Age' at CEO Forum ...

Middleware

KU Leuven joins the iRODS Consortium ...

Sylabs has released SingularityPRO 3.5 ...

Hardware

DDN named finalist in Storage Magazine and SearchStorage 2019 Products of the Year awards ...

Fujitsu receives supercomputer order from Nagoya University's Information Technology Center ...

Controlling light with light ...

WekaIO recognized as a coolest Cloud company by CRN ...

Samsung to Advance High Performance Computing Systems with Launch of Industry's First 3rd-generation (16GB) HBM2E ...

Xperi enters into new patent and technology license agreement with SK hynix ...

Supermicro announces second quarter fiscal 2020 financial results ...

Applications

BSC European supercomputing centre that most has contributed to Pan-Cancer ...

March 2020 HPC User Forum will showcase AI, energy research and other HPC areas ...

Deep learning accurately forecasts heat waves and cold spells ...

Retina-inspired carbon nitride-based photonic synapses for selective detection of UV light ...

Computer simulation for understanding brain cancer growth ...

Gordon examining secure computation ...

Fusion squeeze, global image mapping, computing mental health, and Na+ batteries at Oak Ridge National Laboratory ...

SDSC supercomputer models improve Oregon/Washington coastal forecasts ...

Protein Data Bank archive adds new coronavirus protease structure ...

New quantum switch turns metals into insulators


Measurement of a material where modification of the spin-orbit coupling has been used to make it electronically conductive. The dark colours represent electrons that are free to move through the material, and are an indicator of the conductive behaviour. Credit: Berend Zwartsenberg/SBQMI.
3 Feb 2020 Vancouver - Most modern electronic devices rely on tiny, finely-tuned electrical currents to process and store information. These currents dictate how fast our computers run, how regularly our pacemakers tick and how securely our money is stored in the bank.

In a study published inNature Physics, researchers at the University of British Columbia have demonstrated an entirely new way to precisely control such electrical currents by leveraging the interaction between an electron's spin - which is the quantum magnetic field it inherently carries - and its orbital rotation around the nucleus.

"We have found a new way to switch the electrical conduction in materials from on to off", stated lead author Berend Zwartsenberg, a Ph.D. student at UBC's Stewart Blusson Quantum Matter Institute (SBQMI). "Not only does this exciting result extend our understanding of how electrical conduction works, it will help us further explore known properties such as conductivity, magnetism and superconductivity, and discover new ones that could be important for quantum computing, data storage and energy applications."

Broadly, all materials can be categorized as metals or insulators, depending on the ability of electrons to move through the material and conduct electricity.

However, not all insulators are created equally. In simple materials, the difference between metallic and insulating behaviour stems from the number of electrons present: an odd number for metals, and an even number for insulators. In more complex materials, like so-called Mott insulators, the electrons interact with each other in different ways, with a delicate balance determining their electrical conduction.

In a Mott insulator, electrostatic repulsion prevents the electrons from getting too close to one another, which creates a traffic jam and limits the free flow of electrons. Until now, there were two known ways to free up the traffic jam: by reducing the strength of the repulsive interaction between electrons, or by changing the number of electrons.

The SBQMI team explored a third possibility: was there a way to alter the very quantum nature of the material to enable a metal-insulator transition to occur?

Using a technique called angle-resolved photo-emission spectroscopy, the team examined the Mott insulator Sr2IrO4, monitoring the number of electrons, their electrostatic repulsion, and finally the interaction between the electron spin and its orbital rotation.

"We found that coupling the spin to the orbital angular momentum slows the electrons down to such an extent that they become sensitive to one another's presence, solidifying the traffic jam". stated Berend Zwartsenberg. "Reducing spin-orbit coupling in turn eases the traffic jam and we were able to demonstrate a transition from an insulator to a metal for the first time using this strategy."

"This is a really exciting result at the fundamental physics level, and expands the potential of modern electronics", stated co-author Andrea Damascelli, principal investigator and scientific director of SBQMI. "If we can develop a microscopic understanding of these phases of quantum matter and their emergent electronic phenomena, we can exploit them by engineering quantum materials atom-by-atom for new electronic, magnetic and sensing applications."

Source: University of British Columbia

Back to Table of contents

Primeur weekly 2020-02-10

Exascale supercomputing

Tachyum's reference design will be used in a 2021 AI/HPC supercomputer ...

Quantum computing

Forschungszentrum Jülich to establish technology laboratory for quantum computers ...

FEFU scientists developed method to build up functional elements of quantum computers ...

New quantum switch turns metals into insulators ...

Focus on Europe

International Advanced Research Workshop on High Performance Computing to issue Call for Participation ...

EPSRC appoints Mark Parsons Director of Research Computing ...

e-IRG Workshop "Grand challenges of e-Infrastructures within the new ERA" to issue Call for Participation ...

BigDFT4CHEM wins the EXDCI Call for Spin-off Initiatives (SPI) ...

Eni unveils its new supercomputing system HPC5, the world's most powerful for industrial use ...

Tachyum CEO Dr. Radoslav Danilak discusses 'Bringing Slovakia to the Forefront of the Digital Age' at CEO Forum ...

Middleware

KU Leuven joins the iRODS Consortium ...

Sylabs has released SingularityPRO 3.5 ...

Hardware

DDN named finalist in Storage Magazine and SearchStorage 2019 Products of the Year awards ...

Fujitsu receives supercomputer order from Nagoya University's Information Technology Center ...

Controlling light with light ...

WekaIO recognized as a coolest Cloud company by CRN ...

Samsung to Advance High Performance Computing Systems with Launch of Industry's First 3rd-generation (16GB) HBM2E ...

Xperi enters into new patent and technology license agreement with SK hynix ...

Supermicro announces second quarter fiscal 2020 financial results ...

Applications

BSC European supercomputing centre that most has contributed to Pan-Cancer ...

March 2020 HPC User Forum will showcase AI, energy research and other HPC areas ...

Deep learning accurately forecasts heat waves and cold spells ...

Retina-inspired carbon nitride-based photonic synapses for selective detection of UV light ...

Computer simulation for understanding brain cancer growth ...

Gordon examining secure computation ...

Fusion squeeze, global image mapping, computing mental health, and Na+ batteries at Oak Ridge National Laboratory ...

SDSC supercomputer models improve Oregon/Washington coastal forecasts ...

Protein Data Bank archive adds new coronavirus protease structure ...