Better studying superconductivity in single-layer graphene

Made up of 2D sheets of carbon atoms arranged in honeycomb lattices, graphene has been intensively studied in recent years. As well as the material's diverse structural properties, physicists have paid particular attention to the intriguing dynamics of the charge carriers its many variants can contain.

The mathematical techniques used to study these physical processes have proved useful so far, but they have had limited success in explaining graphene's 'critical temperature' of superconductivity, below which its' electrical resistance drops to zero.

In a new study published in EPJ B, Jacques Tempere and colleagues at the University of Antwerp in Belgium demonstrate that an existing technique is better suited for probing superconductivity in pure, single-layer graphene than previously thought.

The team's insights could allow physicists to understand more about the widely varied properties of graphene; potentially aiding the development of new technologies. Typically, the approach they used in the study is used to calculate critical temperatures in conventional superconductors. In this case, however, it was more accurate than current techniques in explaining how critical temperatures are suppressed with lower densities of charge carriers, as seen in pure, single-layer graphene.

In addition, it proved more effective in modelling the conditions which give rise to interacting pairs of electrons named 'Cooper pairs', which strongly influence the electrical properties of the material.

Tempere's team made their calculations using the 'dielectric function method' (DFM), which accounts for the transfer of heat and mass within materials when calculating critical temperatures. Having demonstrated the advantages of the technique, they now suggest that it could prove useful for future studies aiming to boost and probe for superconductivity in single and bilayer graphene.

As graphene research continues to be one of the most diverse, fast-paced fields in materials physics, the use of DFM could better equip researchers to utilise it for ever more advanced technological applications.

Research paper

Related Links
Springer
Carbon Worlds - where graphite, diamond, amorphous, fullerenes meet

Tweet

Thanks for being there;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

Our news coverage takes time and effort to publish 365 days a year.

If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.

SpaceDaily Monthly Supporter
$5+ Billed Monthly

paypal only

SpaceDaily Contributor
$5 Billed Once

credit card or paypal

New material design tops carbon-capture from wet flue gases
Lausanne, Switzerland (SPX) Dec 12, 2019
Generally speaking, "flue gas" refers to any gas coming out of a pipe, exhaust, chimney etc as a product of combustion in a fireplace, oven, furnace, boiler, or steam generator. But the term is more commonly used to describe the exhaust vapors exiting the flues of factories and powerplants. Iconic though they may be, these flue gases contain significant amounts of carbon dioxide (CO2), which is a major greenhouse gas contributing to global warming. One way to ameliorate the polluting impact of flu ... read more