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Bar-Ilan University Online Newsletter
Newsletter No. 6, December 2016

Solving a Cryptic Puzzle with a Little Help from a Hologram

Shape of an Electron
The shape of the electron in a high temperature superconductor
(Mario Sermoneta)

Scientists from Bar-Ilan University and Harvard have cracked the code of several enigmatic experiments — performed over the past 15 years on superconductors — by developing a mathematical tool to find the shape of the electrons in these materials. Their recent discovery published in Nature Physics provides an innovative technique for calculating the shapes of electrons. This finding will help scientists gain a better understanding of the properties of complex materials, said Dr. Emanuele Dalla Torre of BIU’s Department of Physics.

Dalla Torre, together with Harvard’s Dr. Yange He and Prof. Eugene Demler, used holographic logic to compile an algorithm for visualizing the shape of an electron in a superconducting material. This successful collaboration clarified the puzzling results of a series of experiments performed in the past 15 years, resolving a mysterious scientific enigma.

Dr Emanuele Dalla Torre of BIU Department of PhysicsAccording to quantum mechanics, electrons can possess wave-like properties. “The wave shape, however, is not always apparent, and tends to vary depending on the conditions of the material that hosts the electron. Until now, scientists had viewed the shape of an electron only in isolated atoms — in a vacuum — but not within a complex material containing a vast array of atoms, where the outline of each electron is indistinguishable,” said Dalla Torre.

“We developed a mathematical algorithm that helped us analyze high-precision measurements of cuprates — copper- oxygen compounds known to maintain the best superconductive properties, thus enabling us to reconstruct the shape of the electrons in these wondrous materials. The shape that we found contains positive (blue) and negative (red) regions (as pictured in the figure). The electrons are suspended within an ordered structure of atoms: The blue circles indicate oxygen atoms, while the red circles indicate copper atoms. For the first time ever, we isolated and confirmed a unique shape of an electron within a complex material,” explained Dalla Torre.

“Superconductors are materials that at room temperature, barely conduct electricity. However, when cooled below a certain temperature — the critical temperature — they morph into superheroes and conduct electric currents without any resistance, and without heating up or melting. These materials, are, therefore, highly sought after for their potential use in a variety of next-generation technologies,” explained Dalla Torre. “The highest critical temperature of superconductors discovered until now is that of cuprates, which require cooling to as low as -135° C to become superconductive. The costs involved in cooling down to these temperatures are prohibitively high, which explains the ongoing search for the Holy Grail — the highest possible critical temperature that provides economic viability,” Dalla Torre said.

“We applied the logic of a hologram, which is not an actual image, but rather an encoded pattern based on a special characteristic of light, in order to attain information about a 3D object from measurements of a 2D surface.” By extracting all the information encoded in a 2D STM (high resolution microscope) measurement of a cuprate, the scientists visualized the shape of an electron.

Some consider electrons to be the “soul” of a material — determining its color, its conductivity, and its entire chemical activity. Dalla Torre expects that this innovative technique for decoding shapes of electrons will enable the design of smarter materials suitable for ever-changing future technologies. “By gaining a better understanding of the behavior of materials, scientists may be on the path to finding the next superconductor,” he said.

Also in this issue:

President's Message - December 2016 »

BIU Opens 2016 Academic Year

Celebrating the start of the 2016/2017 Academic Year at BIU, students excitedly gather to snap a selfie. Bar-Ilan University's vibrant campus is home to 21,000 students, among them 1,250 Israeli Arabs (a 20% increase from last year!), about 140 members of the Ultra-Orthodox community, hundreds of French and Anglo Olim, and more than a dozen doctoral and postdoctoral candidates from China.

A Life-Saving Israeli App

Reporty, the world's first free and easy-to-download video emergency app, was developed and is produced and marketed by a team of experts including a number of BIU grads.

 read more »

 

BIU Alumna Empowers Social Change in Arab Sector

As a certified family and couples therapist in her native Nazareth, and a lecturer and Dean of Students at Sakhnin Academic College, Dr. Amal Fahoum-Taha is an agent of change in Israel's Arab sector. With a PhD in psychology from BIU and training in its Psycho-Cardiology Lab, she is making her mark, serving as a model for young Arab women.

 read more »

 

The Biblical Judges: Flesh and Blood Heroes

Unlike heroic leadership stories in other cultures, the Book of Judges presents the leaders of Israel following Joshua's conquest of Canaan (ca. 1150 – 1025 BCE), with all their strengths and weaknesses. "We learn about their greatness, and of their major downfalls — often resulting from excessive of pride," notes BIU Bible Prof. Elie Assis, Dean of the Faculty of Jewish Studies.

 read more »

 
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