Condensed Matter Physics Seminar
Special Time and Place!
1:15 p.m., Thursday, Tuesday, January 27, 2004
Local Gate Control Carbon Nanotube Quantum Dots
Abstract: Detailed studies of carbon nanotube physics and devices
require independent control of nanotube parameters. It is particularly important
to control electron confinement (quantum dot) effects for applications such as
quantum computation. In this talk, I will show how we achieve independent
control of nanotube parameters via multiple electrostatic gates. I will focus on
the fabrication and measurement of a nanotube-based double quantum dot.
Transport measurements of the double-dot device reveal honeycomb charge
stability diagrams as a function of two nearly independent gate voltages. Local
gates are used to manipulate and study single-electron charging effects as well
as charge interactions. I will also show how mechanically fabricated defects can
be locally gated to control conductance through a nanotube device.
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