MIT researchers blend twistronics with quasicrystals, exposing a brand-new approach to comprehend superconductivity and appealing applications in electronic devices.
A brand-new versatile platform could lead and produce enigmatic products to brand-new research studies of unique phenomena.
In research that might jump-start interest into an enigmatic class of products referred to as quasicrystals, MIT associates and researchers have found a fairly basic, flexible way to develop brand-new atomically thin variations that can be tuned for crucial phenomena. In work reported in a recent concern of the journal Nature, they explain doing just that to make the materials exhibit superconductivity and more.
The research introduces a brand-new platform for not just learning more about quasicrystals, but also checking out unique phenomena that can be tough to study however could cause brand-new physics and important applications. A much better understanding of superconductivity, in which electrons pass through a product with no resistance, could allow much more efficient electronic devices.
Picture of a moiré quasicrystal (center column) produced by three overlapping sheets of atomically thin graphene. Credit: Sergio C. de la Barrera/University of Toronto
Twistronics and Its Connection to Quasicrystals
The work brings together 2 previously inapplicable fields: twistronics and quasicrystals. The latter is the specialty of Pablo Jarillo-Herrero, the Cecil and Ida Green Professor of Physics at MIT and corresponding author of the brand-new Nature paper, whose “magic-angle” graphene development in 2018 jump-started the field.
By Elizabeth A. Thomson, Materials Research Study Lab
October 18, 2023
” Its truly extraordinary that the field of twistronics keeps making unanticipated connections to other areas of physics and chemistry, in this case the unique and stunning world of quasiperiodic crystals,” states Jarillo-Herrero, who is likewise associated with MITs Materials Research Laboratory and the MIT Research Laboratory of Electronics.
Noteworthy Advancements in Twistronics
“It changes the spectrum of energy levels offered to the electrons and can supply the conditions for fascinating phenomena to develop,” says Sergio C. de la Barrera, one of four co-first authors of the recent paper. De la Barrera, who performed the work while a postdoc at MIT, is now an assistant teacher at the University of Toronto
Aviram Uri (left) and Sergio C. de la Barrera are part of a group that coaxed superconductivity from an enigmatic class of products understood as quasicrystals. Uri is a Pappalardo and a VATAT postdoc at MIT; de la Barrera is an assistant teacher at the University of Toronto. Credit: Eva Cheung/University of Toronto.
A moiré system can also be tailored for different behaviors by changing the variety of electrons contributed to the system. As a result, the field of twistronics has blown up over the last five years as researchers around the world have actually used it to producing brand-new atomically thin quantum materials. Examples from MIT alone consist of:
Quasicrystals Unveiled.
In the current work, the scientists were tinkering with a moiré system made from 3 sheets of graphene. Graphene is composed of a single layer of carbon atoms arranged in hexagons resembling a honeycomb structure. In this case, the group layered three sheets of graphene on top of one another, however twisted 2 of the sheets at somewhat different angles.
To their surprise, the system produced a quasicrystal, an uncommon class of product found in the 1980s. As the name implies, quasicrystals are someplace between a crystal, such as a diamond, that has a regular duplicating structure, and an amorphous product, like glass, “where the atoms are all jumbled, or randomly organized,” says de la Barrera. In a nutshell, quasicrystals “have actually odd patterns,” de la Barrera says (see some examples here).
Compared to crystals and amorphous materials, nevertheless, reasonably little is learnt about quasicrystals. Thats in part because theyre tough to make. “That doesnt imply theyre not intriguing; it simply means that we have not paid as much attention to them, especially to their electronic properties,” states de la Barrera. The new platform, which is fairly simple, might change that.
Additional Insights and Collaborations.
Because the initial researchers werent professionals in quasicrystals, they connected to someone who is: Professor Ron Lifshitz of Tel Aviv University. Aviram Uri, among the co-first authors of the paper and an MIT Pappalardo and VATAT Postdoctoral Fellow, was a trainee of Lifshitzs throughout his undergraduate research studies at Tel Aviv and knew about his deal with quasicrystals. Lifshitz, who is also an author of the Nature paper, helped the group to better comprehend what they were taking a look at, which they call a moiré quasicrystal.
The physicists then tuned a moiré quasicrystal to make it superconducting, or transfer present with no resistance at all listed below a particular low temperature level. Thats crucial due to the fact that superconducting gadgets could move current through electronic devices far more effectively than is possible today, however the phenomenon is still not fully understood in all cases. The new moiré quasicrystal system brings a brand-new method to study it.
The group likewise discovered evidence of proportion breaking, another phenomenon that “informs us that the electrons are engaging with one another extremely highly. And as physicists and quantum material researchers, we want our electrons communicating with each other since thats where the unique physics takes place,” de la Barrera states.
In the end, “through discussions throughout continents, we were able to understand this thing, and now we believe we have a great deal with on whats going on,” states Uri, although he keeps in mind that “we dont yet completely understand the system. There are still several secrets.”.
The best part of the research was “fixing the puzzle of what it was we had in fact created,” de la Barrera states., so it was an extremely pleasant surprise when we realized we were actually looking at something different and really brand-new.”.
” Its the exact same response for me,” says Uri.
Referral: “Superconductivity and strong interactions in a tunable moiré quasicrystal” by Aviram Uri, Sergio C. de la Barrera, Mallika T. Randeria, Daniel Rodan-Legrain, Trithep Devakul, Philip J. D. Crowley, Nisarga Paul, Kenji Watanabe, Takashi Taniguchi, Ron Lifshitz, Liang Fu, Raymond C. Ashoori and Pablo Jarillo-Herrero, 19 July 2023, Nature.DOI: 10.1038/ s41586-023-06294-z.
Extra authors of the Nature paper are MIT teacher of physics Raymond C. Ashoori; Mallika T. Randeria, a researcher at MIT Lincoln Laboratory who performed the work as a Pappalardo Fellow at MIT and is another co-first author of the paper; Trithep Devakul, an assistant professor at Stanford University who carried out the work as a postdoc at MIT; Philip J. D. Crowley, a postdoc at Harvard University; and Kenji Watanabe and Takashi Taniguchi of the National Institute for Materials Science in Japan.
This work was funded by the U.S. Army Research Office, the U.S. National Science Foundation, the Gordon and Betty Moore Foundation, a MIT Pappalardo Fellowship, a VATAT Outstanding Postdoctoral Fellowship in Quantum Science and Technology, the JSPS KAKENHI, and the Israel Science Foundation.
Aviram Uri (left) and Sergio C. de la Barrera are part of a team that coaxed superconductivity from an enigmatic class of products known as quasicrystals. As the name suggests, quasicrystals are somewhere in between a crystal, such as a diamond, that has a routine repeating structure, and an amorphous product, like glass, “where the atoms are all jumbled, or arbitrarily organized,” states de la Barrera. In a nutshell, quasicrystals “have actually odd patterns,” de la Barrera states (see some examples here).
Aviram Uri, one of the co-first authors of the paper and an MIT Pappalardo and VATAT Postdoctoral Fellow, was a student of Lifshitzs during his undergraduate studies at Tel Aviv and knew about his work on quasicrystals. The new moiré quasicrystal system brings a new method to study it.
Turning a moiré product called magic-angle twisted bilayer graphene into three different– and beneficial– electronic devices. (The scientists associated with that work, reported in 2021, consisted of Daniel Rodan-Legrain, a co-first author of the current work and an MIT postdoc in physics. They were led by Jarillo-Herrero.).
Engineering a brand-new property, ferroelectricity, into a well-known household of semiconductors. (The scientists associated with that work, reported in 2021, were led by Jarillo-Herrero.).
Anticipating exotic brand-new magnetic phenomena, total with a “recipe” for realizing them. (The scientists associated with that work, reported in 2023, included MIT professor of physics Liang Fu and Nisarga Paul, an MIT graduate trainee in physics. Both Fu and Paul are co-authors of the existing paper.).
