[Lex Computer & Tech Group/LCTG] Graphene

Fri Dec 16 07:28:08 PST 2022

More on Graphene talks

Here's another talk by Tomás Palacios
https://www.youtube.com/watch?v=jSkSA6hhqm4

The Superpowers of Extreme Materials | Tomas Palacios | TEDxMIT

TEDx Talks

500 views  Jun 21, 2022
Electronics has deeply transformed society over the last 75 years however,
in spite of its huge impact, we are just starting to scratch the surface of
what is possible. This talk highlights how new materials, such as graphene
and gallium nitride, are quickly enabling a new generation of electronic
systems to give society amazing new superpowers.

Energy, Engineering, Nanoscale, Physics, Semiconductors; Nanotechnology
Tomás Palacios is a Professor in the Department of Electrical Engineering
and Computer Science at MIT. He received his PhD from the University of
California - Santa Barbara in 2006, and his undergraduate degree in
Telecommunication Engineering from the Universidad Politécnica de Madrid
(Spain). His current research focuses on demonstrating new electronic
devices and applications for novel semiconductor materials such as graphene
and gallium nitride. His work has been recognized with multiple awards
including the Presidential Early Career Award for Scientists and Engineers,
the 2012 and 2019 IEEE George Smith Award, and the NSF, ONR, and DARPA
Young Faculty Awards, among many others. Prof. Palacios is the founder and
director of the MIT MTL Center for Graphene Devices and 2D Systems, as well
as the Chief Advisor and co-founder of Finwave Semiconductor, Inc. He is a
Fellow of IEEE. This talk was given at a TEDx event using the TED
conference format but independently organized by a local community. Learn
more at https://www.ted.com/tedx

another talk by Pablo Jarillo Herrero
https://youtu.be/7uFWSu1lrAU?t=1133

Welcome and Plenary Talk: Pablo Jarillo Herrero

CMD2020GEFES

1,903 views  Streamed live on Aug 31, 2020
Inaugural session and Plenary talk "Magic-Angle Graphene:
Superconductivity, Correlations, and Beyond" by Pablo Jarillo Herrero,
Massachusetts Institute of Technology (USA).

Welcome to CMD2020GEFES, a large international conference covering all
aspects of condensed matter physics. The conference combines the biennial
meeting of the Condensed Matter Divisions of the Spanish Royal Physics
Society (RSEF-GEFES) and of the European Physical Society (EPS-CMD). It is
the 28th in the series of Condensed Matter General conferences, held in
Europe since CMD1 –Antwerp 1980. CMD2020GEFES is an Europhysics Conference,
as recognized by the Action Committee on Conferences of the European
Physical Society.

More info at www.cmd2020gefes.eu

Ted

On Fri, Dec 16, 2022 at 10:12 AM Ted Kochanski <tedpkphd at gmail.com> wrote:

> No offense t the journalist -- but the person we want is a Prof in EECS
> today he just got a major promotion at MIT
>
> Tomás Palacios named new director of the Microsystems Technology
> Laboratories
> Palacios has served as director of the 6-A MEng Thesis Program, industry
> officer, and professor of electrical engineering.
> Jane Halpern | Meghan Melvin | Department of Electrical Engineering and
> Computer Science | Microsystems Technology Laboratories
> Publication Date:
> December 15, 2022
>
> here's the announcement for a talk he gave a couple of years ago in Germany
> 13. JANUARY 2020
> <http://www.graphene.ac/index.php/2020/01/13/the-graphene-revolution-from-transistors-to-synthetic-cells-a-talk-by-prof-tomas-palacios-mit/>
>  BY FEDERICA HAUPT <http://www.graphene.ac/index.php/author/haupt/>
> The Graphene Revolution: From Transistors to Synthetic Cells – A talk by
> Prof. Tomás Palacios (MIT)
>
> On January 16, 2020, the Aachen Graphene & 2D Materials center will host a
> seminar by Prof. Tomás Palacios, with the title “The Graphene Revolution:
> From Transistors to Synthetic Cells”.
>
> Palacios is Professor of Electrical Engineering and Computer Science at
> the Massachusetts Institute of Technology (MIT), as well as the founder and
> director of the MIT MTL Center for Graphene Devices and 2D Systems, and
> Chief Advisor and co-founder of Cambridge Electronics, Inc. His research
> interests include the design, processing and characterization of new
> electronic devices based on wide bandgap semiconductors and on
> two-dimensional materials such as graphene, molybdenum disulfide (MoS2) and
> tungsten diselenide (WSe2).  His work has been recognized with multiple
> awards, including the Presidential Early Career Award for Scientists and
> Engineers, the IEEE George Smith Award, and the NSF, ONR, and the DARPA
> Young Faculty Awards.
>
> In his talk, Palacios will review some of the recent progress on the use
> of graphene and other two-dimensional materials for ultra-low power CMOS
> circuits, sensors and large area devices for energy harvesting.  He will
> also present a new generation of micro-systems that probe the limits of
> electronics.
> The other Prof deeply involved in Graphene particularly the so-called
> "Magic Angle" layering of two Graphene Sheets is another young Spaniard at
> MIT, Pablo Jarillo-Herrero, Cecil and Ida Green Professor of Physics
> Best known for his groundbreaking research on twistronics.
> and leader of the Jarillo-Herrero Group and Quantum Nanoelectronics @ MIT
>
> recently Pablo Jarillo-Herrero received the Wolf Prize Laureate in Physics
> 2020 along with two of his "partners in the field"
>
> The 2020 wolf prize in Physics is awarded to:  Pablo Jarillo-Herrero,
> Allan H. MacDonald and Rafi Bistritzer.
>
> Prof. Pablo Jarillo-Herrero
> Massachusetts Institute of Technology – USA
> “For pioneering theoretical and experimental work on twisted bilayer
> graphene.”
>
> Since the 2004 groundbreaking experiments regarding the two-dimensional
> material -graphene, several research groups were soon studying the
> properties of twisted bilayer graphene. Graphene is a significant
> foundation for an entirely new generation of technologies. The hope is that
> graphene-based applications will benefit the environment and reduce costs.
> Electronic and computer industry requires materials whose conductance can
> be controlled.
>
> The work of Jarillo-Herrero, MacDonald and Bistrizer has shown that the
> conductance properties of graphene interfaces can be controlled via the
> spatial misfit angle between the layers and then at certain angles the
> electrons exhibit surprising physical behavior. This physical discovery has
> the potential of leading to an energy revolution.
>
> In 2011, a group led by Allan Macdonald, a theoretical physicist from the
> University of Texas, researched an intriguing behavior of twisted bilayer
> graphene, where the atomic lattices of two stacked graphene layers are
> laterally rotated with respect to each other by a small misfit angle.
> According to the calculations of MacDonald and Bistrizer (who did his
> post-doctoral thesis under the supervision of MacDonald at that time), the
> tunneling velocity of electrons between the layers depends on the misfit
> angle and completely vanishes at the “magic angle” of 1.1 degrees. It was
> hoped that this discovery would lead to the creation of a new type of
> super-conductor, namely a material that allows electrical current to pass
> with no impedance and with no energy loss.
>
> The original paper by MacDonald and Bistrizer, which describes their
> discovery, was not received with enthusiasm by the scientific community and
> was even forgotten for several years.
>
> At the same time, Jarillo-Herrero was working on twisted bilayer graphene
> in his lab at MIT. He became convinced that the ideas expressed by
> Macdonald and Bistrizer had substance.
> His research team  therefore invested considerable efforts in creating and
> measuring twisted bilayer graphene of various twist angles. The experiments
> proved successful in 2017 when it was found that positioning the layers at
> an angle of 1.1 degrees relative to one another (“the magic angle”)
> resulted in unusual electrical properties, precisely as MacDonald and
> Bistrizer have suggested. In this position, at sufficiently low
> temperatures, the electrons move from one layer to the other, creating a
> lattice with unusual qualities. The paper that described the phenomenon,
> which was published in Nature in 2018, revolutionized physics and triggered
> a flood of additional papers.
>
> The discovery opens the door to building a super-conductor from bilayer
> graphene, in which electron movement is completely controlled by external
> electrical current.
>
> This electrical behavior resembles the behavior of copper-based
> superconductors called Cuprates. Cuprates demonstrate electrical
> conductivity with no resistance in relatively high temperatures compared
> with other super-conductors. For this reason, Cuprates now form a source of
> hope for realizing the dream of electrical conductivity with no energy loss
> at temperatures close to room temperature. If this mission is achieved, it
> would lead to a far-reaching energy revolution. However, one obstacle that
> prevents this revolution is that we do not yet have a theory that explains
> the behavior of superconductors at high temperatures. In the absence of a
> solid theoretical foundation, it is difficult to develop new, better
> materials. This is one of the reasons for the excitement around the
> discovery of bilayer graphene and the magic angle, which allows us to
> understand better what happens on the microscopic level when transitioning
> from a conductor to a superconductor state.
>
> Pablo Jarillo-Herrero (1976, Valencia) is an experimental condensed matter
> physicist who works on quantum electronic transport and optoelectronics in
> novel two-dimensional materials. His lab investigates their
> superconducting, magnetic, and topological properties. Jarillo-Herrero
> joined MIT in 2008 and was promoted to full professor in 2018. He received
> his ”licenciatura” in physics from the University of Valencia in Spain, in
> 1999; a master of science degree from the University of California at San
> Diego in 2001; and his PhD from the Delft University of Technology in the
> Netherlands, in 2005.
>
>
> Pablo Jarillo-Herrero could be on track for a Nobel Prize based on his
> work with multiple layers of Graphene and other 2-D materials
>  see for example
>
> https://www.youtube.com/watch?v=O2HVCjhuJlE
> Mar 14, 2018
> Pablo Jarillo-Herrero (MIT) presents his surprising discovery of an
> ultrathin material consisting of two misaligned sheets of graphene that can
> be easily converted from being a Mott insulator to a superconductor at the
> APS March Meeting 2018 in Los Angeles, CA.
> -------------------------------------------------
> Magic-Angle Graphene Superlattices: a New Platform for Strongly Correlated
> Physics
> APS Physics
>
> 27,041 views
>
> -------------------------------------------------
>
> In this talk I will discuss a new platform for strongly correlated physics
>> based on magic-angle graphene superlattices. In particular, I will show
>> that when two graphene sheets are twisted by an angle close to the
>> theoretically predicted ‘magic angle’, the resulting flat band structure
>> near the Dirac point gives rise to a strongly-correlated electronic system.
>> These flat bands exhibit half-filling insulating phases at zero magnetic
>> field, which we show to be a Mott-like insulator arising from electrons
>> localized in the moiré superlattice. Doping away from the Mott-like state,
>> we achieve electrically tunable superconductivity, with many
>> characteristics similar to cuprate superconductivity, including
>> superconducting domes, small Fermi pockets, and strong coupling.
>
>
>
>    - or the Nature
>    - NEWS FEATURE
>    - 02 January 2019
>    *How ‘magic angle’ graphene is stirring up physics*
>    Misaligned stacks of the wonder material exhibit superconductivity and
>    other curious properties.
>    https://www.nature.com/articles/d41586-018-07848-2
>
>
>    - Elizabeth Gibney
>    <https://www.nature.com/articles/d41586-018-07848-2#author-0>
>
> [image: Pablo Jarillo-Herrero, professor of physics, holding materials in
> his lab at MIT]Overlapping two sheets of graphene shows a characteristic
> pattern.Credit: Juliette Halsey for *Nature*
>
> It was the closest that physicist Pablo Jarillo-Herrero had ever come to
> being a rock star. When he stood up in March to give a talk in Los Angeles,
> California, he saw scientists packed into every nook of the meeting room.
> The organizers of the American Physical Society conference had to stream
> the session to a huge adjacent space, where a standing-room-only crowd had
> gathered. “I knew we had something very important,” he says, “but that was
> pretty crazy.”
>
> The throngs of physicists had come to hear how Jarillo-Herrero’s team at
> the Massachusetts Institute of Technology (MIT) in Cambridge had unearthed
> exotic behaviour in single-atom-thick layers of carbon, known as graphene.
> Researchers already knew that this wonder material can conduct
> electricity at ultra-high speed
> <https://www.nature.com/news/graphene-conducts-electricity-ten-times-better-than-expected-1.14676>.
> But the MIT team had taken a giant leap by turning graphene into a
> superconductor: a material that allows electricity to flow without
> resistance. They achieved that feat by placing one sheet of graphene over
> another, rotating the other sheet to a special orientation, or ‘magic
> angle’, and cooling the ensemble to a fraction of a degree above absolute
> zero. That twist radically changed the bilayer’s properties — turning it
> first into an insulator and then, with the application of a stronger
> electric field, into a superconductor.
>
> Ted
>
> On Thu, Dec 15, 2022 at 10:17 PM Charles Holbrow <chholbrow at gmail.com>
> wrote:
>
>> Dan Kleppner has spoken with Maia Weinstock who is a science writer and
>> Associate Director at MIT News.  She is author of a recent biography of
>> Millie Dresselhaus (1930-2017).  Its title *Carbon Queen *recognizes
>> Millie's important work on carbon nanotubes.  Ms. Weinstock lives in
>> Belmont and says she's willing to talk to us but wants to speak to a live
>> audience.
>>
>> Have any of us read her book?
>>
>> Can we provide a big enough --- say 20 --- live audience so that LCTG is
>> not embarrassed?  The current 5 to 7 live audience would be embarrassingly
>> small.
>>
>> Work on layers of graphene two and three sheets thick and rotated small
>> angles with respect to each other has found superconductivity and other
>> surprising electronic effects.  The studies of graphene are producing
>> exciting discoveries.
>>
>> --Charlie
>>
>> On Thu, Dec 15, 2022 at 1:31 PM john rudy <jjrudy1 at comcast.net> wrote:
>>
>>> Do we have a metallurgist in the group (or one with a contact) who could
>>> give us a talk on graphene?
>>>
>>> John
>>>
>>>
>>>
>>> John Rudy
>>>
>>> 781-861-0402
>>>
>>> 781-718-8334 (cell)
>>>
>>> John.rudy at alum.mit.edu
>>>
>>>
>>>
>>> 13 Hawthorne Lane
>>>
>>> Bedford, MA  01730-1047
>>>
>>>
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