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MIT/ILP Calendar Event

Imaging Electron Waves in Graphene

September 30, 2010, 3 PM

Overview

Professor Robert Westervelt
Harvard University

Abstract:

Graphene is an exciting new material with properties that are radically different from traditional semiconductors. We use a cooled scanning probe microscope (SPM) to probe the motion of electrons in graphene. At low temperatures, the coherent interference of electron waves scattered by disorder leads to universal conductance fluctuations (UCF) and weak localization. A movable scatterer created by the SPM tip maps these conductance fluctuations vs. tip position. For UCF we find conductance images that resemble speckle patterns, that change by 8G ~ e2/h when the tip moves by half the Fermi wavelength. Our conductance images also probe coherent scattering and weak localization in magnetic fields.

Biography:

Robert Westervelt received his Ph.D. from the University of California, Berkeley in 1977. Following a postdoctoral appointment at Berkeley, he moved to Harvard University, where he is currently Mallinckrodt Professor of Applied Physics & Physics.

Westervelt's group has developed liquid-He cooled scanning probe microscopes that can image the motion of electron waves through a two-dimensional electron gas, and act as movable gates to control few-electron quantum dots. His group has also made hybrid Integrated Circuit / Microfluidic chips that act as programmable microfluidic systems to manipulate biological cells and liquid droplets.

Robert Westervelt is Director of the NSF-funded Nanoscale Science and Engineering Center titled Science of Nanoscale Systems and their Device Applications, which includes participants at Harvard, MIT, UC Santa Barbara and the Museum of Science, Boston.

Location

Building 36, Room 428

Registration

For the most up-to-date information, please visit our website at www.rle.mit.edu/mnss or contact: Carol Livermore (livermore@mit.edu), Christopher Love (clove@mit.edu), Fatih Yanik (yanik@mit.edu), or Chadwick Collins (chadcoll@mit.edu).