University
of Toronto
Physics Department
Quantum Optics and Condensed Matter
MONDAY SEMINAR
University
of Toronto
MONDAY SEMINAR
| Speaker : | DR. ANDREW SACHRAJDA
Institute For Microstructural Sciences National Research Council Canada Ottawa, ON |
| Topic : | "Transport Spectroscopy of Few Electron Quantum dots
with Spin Polarized Electrons" |
| Time : | Monday, January 31, 2000 at 12:10 p.m. |
| Place : | Room 408, Burton Tower 60 St. George Street / 255 Huron Street |
Abstract
Quantum Dots are often referred to as 'artificial' atoms.
A large and rapidly growing variety of potential applications have
been suggested for such dots. These range from lasers to quantum
computing elements. Unlike real atoms, however, quantum dot properties
can be tuned. In this talk I will describe experiments which probe
the addition spectrum of a single dot in a magnetic field using electron
transport techniques. I will describe a simple technique that we
have found and utilized to achieve the injection of spin polarized electrons
into the dot. This technique allows us to extract information about
the important spin properties of the dot. The (B,N) phase diagram
was mapped out by tuning the electron number from zero to over 50 by the
application of a gate voltage. A comparison to exact diagonalisation
calculations will be made which confirm amongst other effects, the first
observation of spin textures in a quantum dot. The possible application
of these dots to quantum computing will also be briefly discussed.
Local Host: James
Fraser
(416-978-4395)