(April 3, 2019) -- Building on the Air Force’s need to develop tech devices that require minimal charging in the field, the University of Texas at San Antonio (UTSA) is using principles in quantum science and engineering to build a graphene-based logic device. This new technology will improve the energy efficiency of battery-dependent devices from cell phones to computers.
“We are developing devices that can operate almost battery-less,” said Ethan Ahn, UTSA assistant professor in electrical engineering.
UTSA engineers are using spintronics, the study of an electron’s intrinsic quantum mechanical property called spin, to allow low-power operation with a possible application in quantum computing.
“An electron is a little, but very strong magnet,” said Ahn. “Just imagine that an electron spins on its own axis, either up or down.”
Traditional tech devices use the electronic charge of electrons for power. In spintronics, researchers are tapping the inherent spin of electrons as a new power source. With this new approach, devices will require fewer electrons to operate.
There are hurdles, however, in harnessing the power of spin. In quantum computing that harnesses spin of electrons to transmit information, the challenge for researchers is how to capture spin as efficiently as possible.
“If you have 100 electrons injected to the channel to power the next logic circuit, you may only get to use one or two spins because the injection efficiency is very low. This is 98 percent spin lost,” said Ahn.
To prevent the loss of spin, Ahn has developed the new idea of the “zero-power carbon interconnect” by using nanomaterials as both the spin transport channel and the tunnel barrier. These nanomaterials are like a sheet of paper, a two-dimensional layer of carbon atoms just a few nanometers in thickness, and it’s the point of contact where spin injection is inputted into the device. Ahn’s prototype is an interconnect built with a reduced graphene oxide layer.
“It’s novel because we are using graphene, a nanomaterial, to enhance spin injection. By controlling the amount of oxide on the graphene layers, we can fine tune electrons’ conductivity,” said Ahn.
Graphene has widespread appeal because it’s the world's strongest nanomaterial. In fact, the room temperature conductivity of graphene is higher than that of any other known material.
If successful, the zero-power carbon interconnect that Ahn is creating with his collaborators at UT-Austin and Michigan State University would be integrated into the logic component of a computer chip.
The device, once developed, will be submitted to the U.S. Air Force Office of Scientific Research, which is supporting UTSA’s work with a three-year grant.
“The military needs smaller devices that can operate in remote fields without need to recharge batteries,” said Ahn. “If our zero-power carbon interconnect is successful, it will improve the efficiency of graphene spintronics — a crucial step in advancing the next generation of low-power electronics like quantum computing.”
This interconnect could also be highly beneficial to the cloud computing industry. According to the Data Knowledge Center, on-demand cloud computing platforms such as Amazon Web Services alone consume about two percent of the nation’s energy. If the zero-power carbon interconnect is successful, cloud servers such as those that offer streaming services like Netflix or host data, could operate faster and with less electricity.
Learn more about the UTSA Nano Lab.
Learn more about the UTSA Department of Electrical and Computer Engineering.
Celebrate UTSA’s 50th Anniversary and share social media posts about the 50th using the hashtag #UTSA50.
UTSA invites you to participate in our community altar by RSVP to this event. You can also use this link to learn more about Día de Los Muertos:https://anendlessconnection.weebly.com/the-project.html.Student Union Window Lounge, Main Campus
October 28th celebrates National Immigrants Day. On this day, we gather to explore the diverse heritage of our nation’s social fabric. We dedicate this day to understanding how our nation was founded and built by immigrants. Our goal is for the UTSA family to recognize and celebrate how all immigrants, regardless of their citizenship status, contribute to our community through their resiliency and ingenuity.Multicultural Student Lounge, HSU 2.207, Main Campus
The COLFA Advanced Career Pathways Workshops are focused on connecting your education with your career aspirations and exploring your pathways to reach your goal.Mesquite Room, Student Union, 2.01.24, Main Campus
The Westside Community Center will be creating an altar or "ofrenda" as many do within San Antonio and the Westside for "Dia de los Muertos." If you would like to participate, we invite you to send in a photo of a loved one that will be placed in this space. You are welcome to join us on October 28th at 3:00 pm to set up the space and come see us at the Westside Community Center.UTSA Westside Community Center, 1310 Guadalupe St., San Antonio, TX 78207
Blueprints For Pangaea is hosting its first on-campus inventory event of the semester! Join us for a Halloween-themed afternoon where we'll inventory medical supplies while enjoying Halloween movies. By the end of the event, you will have positively impacted the health of hundreds of individuals. We require at least one hour of attendance and come dressed up because the best costumes will earn awards.Flawn Sciences Building, 3.02.02, Main Campus
Chris Villanueva and other jazz faculty will perform standards in this concert. More details to come. The Fall 2021 concert schedule is subject to change. Please continue to monitor our website and social media for updates. This concert will be live-streamed via the UTSA Music Facebook page. https://www.facebook.com/UTSAMusic When:UTSA Recital Hall, Main Campus
UTSA Sustainability will have three courses of varying difficulty to accommodate different ages and abilities. There will a one mile walk on generally level surface to introduce you to the student run community garden, a longer walk with stairs and topo changes, and a five mile bike ride to introduce you to the Leon Greenway.Tito Bradshaw Bicycle Repair Shop Ximenes Ave, Main Campus
The University of Texas at San Antonio is dedicated to the advancement of knowledge through research and discovery, teaching and learning, community engagement and public service. As an institution of access and excellence, UTSA embraces multicultural traditions and serves as a center for intellectual and creative resources as well as a catalyst for socioeconomic development and the commercialization of intellectual property - for Texas, the nation and the world.
To be a premier public research university, providing access to educational excellence and preparing citizen leaders for the global environment.
We encourage an environment of dialogue and discovery, where integrity, excellence, inclusiveness, respect, collaboration and innovation are fostered.
UTSA is a proud Hispanic Serving Institution (HSI) as designated by the U.S. Department of Education.
The University of Texas at San Antonio, a Hispanic Serving Institution situated in a global city that has been a crossroads of peoples and cultures for centuries, values diversity and inclusion in all aspects of university life. As an institution expressly founded to advance the education of Mexican Americans and other underserved communities, our university is committed to ending generations of discrimination and inequity. UTSA, a premier public research university, fosters academic excellence through a community of dialogue, discovery and innovation that embraces the uniqueness of each voice.