Han Wang, associate professor of electrical and computer engineering at the University of Southern California Viterbi School of Engineering, along with postdoctoral scholar Jiangbin Wu, PhD students Hung-Yu Chen and Xiaodong Yan, have achieved this through a concept called the ferroelectric tunneling junction (FTJ).
This new memory device is part of a family known as non-volatile memory devices, meaning they can be unplugged and still retain their data, much like cell phone memory and USB flash drives. Unlike current FTJ devices, this device is comprised of asymmetric metal and semi-metallic graphene materials. By taking these materials and building them into a novel structure, they were able to exceed the performance of all previously demonstrated FTJs while offering promising prospects for integration with silicon electronics.
Furthermore, the unique ability of these materials to approach atomic-scale thickness can eventually lead to even faster and more energy-efficient FTJ memory down the line. “These materials allow us to build devices that can potentially be scaled to atomic-scale thickness,” Wang said. “This means the voltage required to read, write, and erase data can be drastically reduced which in turn can make the memory electronics much more energy efficient.”
Wang and his fellow researchers hope that with time, their device can be scaled up and may become a replacement not just for the non-volatile memory that we see in cell phones and USB sticks, but also volatile memory like D-RAM storage devices commonly found in computers. In addition, the device may also be engineered to hold multi-bit data states within a single cell, and with its robust endurance and retention, it has promising potential for applications in in-memory computing and other computing hardware.
About the USC Viterbi School of Engineering
Engineering began at the University of Southern California in 1905. Nearly a century later, in 2004, the school was named the USC Viterbi School of Engineering, honoring alumnus Andrew J. Viterbi, inventor of the Viterbi algorithm, a key to cell phone technology and numerous data applications. The school is consistently ranked among the top engineering programs in the world. It enrolls more than 7,000 undergraduate and graduate students, taught by 188 tenured and tenure-track faculty, with more than 90 endowed chairs and professorships. The school offers comprehensive programs in all major areas of engineering, from aerospace and astronautical engineering, to biomedical, chemical, civil and environmental engineering, to computer science and materials science, and to electrical engineering, industrial and systems engineering and mechanical engineering. With annual research expenditures exceeding $207M, the school is home to the Information Science Institute and more than 45 other research centers. Its more than 50,000 alumni span the globe. USC Viterbi is also home to the pioneering distance learning program DEN@Viterbi, ranked as the top such program in the nation the last two years. USC Viterbi is the only engineering school in the nation with three top-10 USNWR rankings: Best Graduate Schools, Best Online Graduate Engineering Programs, and Best Online Information Technology Programs.
