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Events in Physics
Title: 290K Condensed Matter Seminar    (Seminar)
Start Date: 02/27/2006
Time: 2:30 pm
Location: 2 LeConte Hall
Speaker: Jiwoong Park
Affiliation: Rowland Institute, Harvard University
Contact Person: Frances Hellman   (510) 642-6135
Details: Nanometer Physics in Nanostructure-based Photonic and Electronic Devices: Designing and engineering electronic, photonic, thermoelectric and charge sensing nanostructures and nanodevices Nanostructures, including single molecules, carbon nanotubes and semiconductor nanowires often exhibit excellent characteristics that are comparable, and in some cases even superior, to the properties of traditional semiconductors. Their electrical and optical properties are determined by the complex interplay between multiple processes occurring in differing length and time scales. Exploring electrical and optical phenomena at this scale therefore requires a tool to investigate these complex, multi-scale processes at the system-wide level. In this talk, I will discuss our approach for investigating the coupling between electronic motion in 1D and 2D nanostructures and various physical properties, including the electron band map, contact energy barriers, photon creation and electron phonon couplings. In addition to the traditional conductance measurements, we use scanning photocurrent microscopy recently developed in our group, which provides the spatial and energy information that has been long sought after to better understand the characteristics of nanomaterials. I will also discuss a charge sensor based on a nanoscale transistor, which can be used as an ultrasensitive probe in water. Using this, we can measure dynamics of a small number of charged molecules on biomembranes in water. More quantitative analysis shows that the charge detection for the membrane molecules is extremely efficient.