Nav: Home

Cooling by laser beam

June 08, 2018

A laser pulse that for a few picoseconds - i.e. one millionth of one millionth of a second- transforms a material into a high-temperature superconductor. Different experiments have unveiled this interesting phenomenon, with potential applicative implications. Research carried out by SISSA scientists a year ago had already provided several basic principles of the phenomenon. A new study published on Physical Review Letters now clarifies other important aspects.

It is a well-known fact that light heats. This seems to be an obvious observation; in actual fact this is correct only for sufficiently long times, much longer than those in which photo-induced superconductivity has been observed, and in which the quantum effects of light-matter interaction become relevant, with particular reference to the fact that light is absorbed in a highly selective manner. What SISSA scientists have explained with their new study is that in the very short space of time in which it acts, the laser pulse can, in some circumstances, populate high-energy states, which heat up, and simultaneously depopulate low energy ones, which thus cool down. It is precisely the latter that are responsible for superconductivity. This selective cooling, shown rigorously in a very simplified theoretical model, could explain not only the experimental observations, but also open the way to new and potentially important research activities.

The ultra-short control of materials by light is a topic that attracts the interests of the scientific community, and others, in the perspective of building electronic devices whose physical properties, for example the ability to conduct electricity, could change with the application of a laser pulse, which, therefore, would effectively play the role of an ultra-fast switch.

Scuola Internazionale Superiore di Studi Avanzati

Related Superconductivity Articles:

Looking at light to explore superconductivity in boron-diamond films
More than a decade ago, researchers discovered that when they added boron to the carbon structure of diamond, the combination was superconductive.
Discovery in new material raises questions about theoretical models of superconductivity
The US Department of Energy's Ames Laboratory has successfully created the first pure, single-crystal sample of a new iron arsenide superconductor, CaKFe4As4, and studies of this material have called into question some long-standing theoretical models of superconductivity.
Superconductivity with two-fold symmetry -- new evidence for topological superconductor SrxBi2Se3
Topological superconductivity is the quantum condensate of paired electrons with an odd parity of the pairing function.
Portable superconductivity systems for small motors
Superconductivity is one of modern physics' most intriguing scientific discoveries.
Graphene's sleeping superconductivity awakens
The intrinsic ability of graphene to superconduct (or carry an electrical current with no resistance) has been activated for the first time.
Superconductivity of pure Bismuth crystal at 0.00053 K
Scientists at TIFR Mumbai have discovered superconductivity of pure Bismuth crystal.
When crystal vibrations' inner clock drives superconductivity
Superconductivity is like an Eldorado for electrons, as they flow without resistance through a conductor.
Physicists induce superconductivity in non-superconducting materials
Researchers at the University of Houston have reported a new method for inducing superconductivity in non-superconducting materials, demonstrating a concept proposed decades ago but never proven.
A new spin on superconductivity
Researchers from the Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS) have made a discovery that could lay the foundation for quantum superconducting devices.
Superconductivity: After the scenario, the staging
Superconductivity with a high Tc continues to present a theoretical mystery.

Related Superconductivity Reading:

Introduction to Superconductivity: Second Edition (Dover Books on Physics) (Vol i)
by Michael Tinkham (Author)

Superconductivity (Elsevier Insights)
by Charles P. Poole Jr. (Author), Horacio A. Farach (Author), Richard J. Creswick (Author), Ruslan Prozorov (Author)

Superconductivity, Superfluids, and Condensates (Oxford Master Series in Physics)
by James F. Annett (Author)

by The Open University

Superconductivity: An Introduction
by Reinhold Kleiner (Author), Werner Buckel (Author), Rudolf Huebener (Translator)

Superconductivity: A Very Short Introduction
by Stephen J. Blundell (Author)

Statistical Mechanics of Superconductivity (Graduate Texts in Physics)
by Takafumi Kita (Author)

Theory Of Superconductivity (Advanced Books Classics)
by J. Robert Schrieffer (Author)

by Eugene A Andryushin (Author), Vitaly Lazarevich Ginzburg (Author)

by Cambridge University Press

Best Science Podcasts 2018

We have hand picked the best science podcasts for 2018. Sit back and enjoy new science podcasts updated daily from your favorite science news services and scientists.
Now Playing: TED Radio Hour

We're told if the economy is growing, and if we keep producing, that's a good thing. But at what cost? This hour, TED speakers explore circular systems that regenerate and re-use what we already have. Guests include economist Kate Raworth, environmental activist Tristram Stuart, landscape architect Kate Orff, entrepreneur David Katz, and graphic designer Jessi Arrington.
Now Playing: Science for the People

#504 The Art of Logic
How can mathematics help us have better arguments? This week we spend the hour with "The Art of Logic in an Illogical World" author, mathematician Eugenia Cheng, as she makes her case that the logic of mathematics can combine with emotional resonance to allow us to have better debates and arguments. Along the way we learn a lot about rigorous logic using arguments you're probably having every day, while also learning a lot about our own underlying beliefs and assumptions.