Spintronics is an emerging field of technology where devices work by manipulating the spin of electrons rather than their charge.
The field can bring significant advantages to computer technology, combining higher speeds with lower energy consumption. Spintronic circuits need ways to control electron spin without interference from electron charge.
Scientists at EPFL, working with Université Paris-Sud and Paul Scherrer Institut, have discovered that a common insulating material behaves as a perfect spintronic conductor because it is not affected by background electron charge. In addition, the material's properties make it an ideal platform for directly observing a strange subatomic particle that could one day lead to a different, more stable type of quantum computers.
Spintronics (spin-transport or spin-based electronics) is a technology that exploits a quantum property of electrons called spin. Although difficult to describe in everyday terms, electron spin can be loosely compared to the rotation of a planet or a spinning top around its axis.
Spin exists in either of two directions: "up" or "down", which can be described respectively as the clockwise or counter-clockwise rotation of the electron around its axis. Ultimately, spin is what gives electrons their magnetic properties, influencing the way they behave when they enter a magnetic field.
The different directions of electron spin can be used to encode information, much like the binary code used in digital communication. Spintronics can therefore open up a new generation of devices that combine conventional microelectronics with spin-dependent effects, overcoming the limitations of today's electronics like speed and energy consumption.
The main challenge is being able to actually control electron spin, turning "up" or "down" as needed. This can be achieved with certain materials, but the problem is that these are often susceptible to interference from the charge of electrons.
An ideal material for spintronics
The team of Hugo Dil at EPFL, working with scientists from Paris and the PSI, has shown that a transparent insulating material, which normally does not conduct electrical charge, shows spin-dependent properties. The scientists used a method called SARPES, which has been perfected by Hugo Dil's group. The data showed that the electron gas at the surface of strontium titanate (SrTiO3) is spin-polarized, which means that it could be used to control the spin of electrons.
"This is interesting because it is the first evidence of a large spin polarization effect on a truly insulating substrate", says Hugo Dil. The discovery has significant implications for the future of spintronics, because it can lead to the development of spin-polarized materials that are not susceptible to interference from non spin-polarized electrical charge, allowing for finer and better control of electron spin.
A new particle for a different kind of quantum computer
Beyond spintronics, this insulating material might also be important for quantum computing, as it could be used to directly observe an elusive, strange particle called the Majorana fermion. This particle is unique because it actually is its own antiparticle as well.
Sometimes referred to as the "ghost particle", the Majorana fermion has zero energy, zero moment, zero spin, and, so far, has never been observed unambiguously. In the future, Majorana fermions could become the foundation for a different kind of quantum computer that would, in theory, be exceptionally stable, as it would not be susceptible to external interference and noise.
This work represents an equal collaboration between Hugo Dil's group at EPFL (ICMP-SOIS), a group from the Université Paris-Sud (CSNSM & CNRS/IN2P3), and experts at Paul Scherrer Institut (Swiss Light Source).
Santander-Syro AF, Fortuna F, Bareille C, Rödel TC, Landolt G, Plumb NC, Dil JH, Radović M. Giant spin splitting of the two-dimensional electron gas at the surface of SrTiO3. Nature Materials DOI: 10.1038/nmat4107
Nik Papageorgiou | Eurek Alert!
Astronomers find unexpected, dust-obscured star formation in distant galaxy
24.03.2017 | University of Massachusetts at Amherst
Gravitational wave kicks monster black hole out of galactic core
24.03.2017 | NASA/Goddard Space Flight Center
Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.
The results will be published on March 22 in the journal „Astronomy & Astrophysics“.
Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...
Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.
Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...
In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to simulate these confined natural conditions in artificial vesicles for the first time. As reported in the academic journal Small, the results are offering better insight into the development of nanoreactors and artificial organelles.
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to...
20.03.2017 | Event News
14.03.2017 | Event News
07.03.2017 | Event News
24.03.2017 | Materials Sciences
24.03.2017 | Physics and Astronomy
24.03.2017 | Physics and Astronomy