Abstract:
The strong electron-electron interaction in the transitional metal oxides gives rise to a dizzying array of novel phenomena that are not present in conventional semiconductor systems. Meanwhile, semiconductors are clean and dilute enough for nanoelectronic applications which are hard to achieve in oxides. Here we present the concept of correlated oxide nanoelectronics to bridge the gap between semiconductor nanoelectronics and strongly correlated phenomena in oxides. I will give out several examples to show such combination has great advantages: 1) Nanoelectric tools are powerful to study correlated phenomena. We can “sketch” a superconducting single electron transistor at an oxide interface to reveal the physics of electron pairing without superconductivity in low density SrTiO3 [1], and show the electron-electron interaction can be tuned from attractive to repulsive[2]. 2) Electron correlations add richness of properties to nanoelectronic devices. Specifically, I will talk about the interesting properties in a electron waveguide at the LaAlO3/SrTiO3 interface[3]. Then, I will talk briefly on our recent progress on studying the 1D origin of quantum oscillations at oxide interfaces[4], and the nature of 1D superconductivity in an oxide nanowire[5]. Finally, I will talk about possible future applications in quantum technologies.
[1] Cheng et al., Nature 521, 196 (2015)
[2] Cheng et al., PRX 6, 041042 (2016)
[3] Annadi et al., Nano Lett. 18, 4473 (2018)
[4] Cheng et al., PRL 120, 076801 (2018)
[5] Pai et al., PRL 120, 147001 (2018)
Biography:
Dr. Guanglei Cheng earned his B.S. degree from the University of Science and Technology of China (USTC) in 2003, and his M.S. and Ph.D. degrees from the University of Pittsburgh in 2005 and 2011. He subsequently stayed in Pittsburgh as a postdoctoral researcher and research assistant professor till 2016. During his study in Pittsburgh, Dr. Cheng and his colleague developed a rewritable nanofabrication technique that utilizes a conductive atomic force microscope tip to create a series of oxide nanodevices, and discovered some novel physics in these devices. This technique represents the best resolution and configurability in oxides. In 2016, Dr. Cheng joined the School of Physical Sciences in USTC as a faculty member under the support from the national “1000 Talent Plan for Young Scholars”. Dr. Cheng published numerous scientific papers in influential journals including Nature, Nature Nanotechnology, PRX and PRL. More information can be found via epsilon.ustc.edu.cn.
Seminar by the NYU-ECNU Institute of Physics at NYU Shanghai