(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.
The events are a collaborative effort between student organizations, student led-groups, and campus departments.Various locations, Main and Downtown Campuses
UTSA is a designated early voting site for the May 4 Joint, General and Special Election. Any registered Bexar County voter can skip the lines and cast a ballot at UTSA from Monday, April 22 to Tuesday, April 30.H-E-B Student Union (HSU 1.002), Main Campus
In this UTSA 50th anniversary speaker series, Roger Enriquez, UTSA associate professor of criminal justice, explores how immigration past and present helps us understand its future.Casa Hernán, 411 Cevallos St., San Antonio
Discussion will explore the new Master of Arts in Global Affairs offered through the Department of Political Science and Geography at UTSA. Guest speakers will include representatives from local and federal government, military, and civil society.H-E-B Student Union Travis Room (HSU 2.202), Main Campus
An evening of fine food and drink inspired by UTSA’s renowned Mexican Cookbook Collection. Proceeds from the event will support UTSA’s Mexican Cookbook Collection.Hotel Emma, 136 E Grayson St., San Antonio
Grab a friend and sign up to bowl with fellow Roadrunners and raise money for scholarships.University Bowl, 12332 I-10 #10, San Antonio
The UTSA Department of Art and Art History present the work of emerging artists who are graduating from UTSA. Work ranges from traditional methods and materials, interdisciplinary and new media. Themes range from social and cultural critique to investigations that are challenging and exquisite explorations in creative form and image.Arts Building, Main Art Gallery (ART 2.03.04), Main Campus
UTSA's first spring Commencement ceremony begins at 10 a.m., May 18 and honors graduates from the College of Liberal and Fine Arts and University College.Alamodome, 100 Montana St., San Antonio
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.