University of California, Riverside

Department of Electrical and Computer Engineering

Semiconductor Nanowires: Building Blocks for Future Digital Computation and More

Semiconductor Nanowires: Building Blocks for Future Digital Computation and....


Dr. Jie Xiang

Assistant Professor, Electrical and Computer Engineering Director University of California, San Diego

When: Monday, October 19, 2009
Time: 2:00pm - 3:00pm
Location: ENGR2 138


Current advancements in material science and chemistry have allowed rational synthesis of nanodot, nanowire and nanotube materials with different structure, composition, and with size control at the atomic precision. These nanoscale building blocks make it possible to assemble devices for a wide range of applications from nanoelectronics to ultra-sensitive medical sensors in the “Bottom-up” paradigm with promise for ever more compact, powerful and energy efficient devices that will impact our everyday lives. Underpinning applications of future nanoelectronics is the understanding of fundamental charge transport phenomena related to quantum confinement effect from such small dimensions. In this talk I will present transport measurement of Ge/Si core/shell nanowire heterostructures as an example, where signatures of conductance quantization indicative of transport through individual 1D subbands due to radial quantum confinement were observed. The clean, high mobility nanowire channel shows great promise for high performance digital computation that could surpass and supplement current CMOS technology and extend the roadmap into the next a few decades. The scalability of these nanodevices into the sub-100 nm channel length and THz switching speed regime will also be discussed. Lastly, I will introduce a new “bottom-up” paradigm for coupled nanoelectromechanical systems, where efficient conversion between electrical and mechanical energy can be realized in a nanoscale device, which further extends the application of nanowire building blocks into high speed, low power consumption functionalities.

About the Speaker:

Dr. Jie Xiang joined the Department of Electrical and Computer Engineering and the Materials Science Engineering program at University of California, San Diego as an Assistant Professor in 2009. Prior to his appointment he was a KNI Prize postdoctoral fellow in the Kavli Nanoscience Institute at California Institute of Technology. He received the B.S. degree in physics from Peking University in China (2002), the A.M. degree in physics (2006) and the Ph.D. degree in chemical physics from Harvard University in 2007. His research interests include quantum transport phenomena in nanostructured materials and the development of novel nanoelectronic and electromechanical devices for switching, logic and sensing applications. He is a recipient of the Materials Research Society Graduate Student Gold Award and the KNI Prize Postdoctoral Fellowship. 

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