Text Only Queen's U. Directory Contact: Queen's  |  Physics
 queensu.ca   physics.queensu.ca    


Home

............................................

  General Information

............................................
 
Contact Us

.....................................
 
Maps and Directions

.....................................
 
Colloquia and Talks

.....................................
 
Department News

.....................................
 
Employment

.....................................
 
Facilities

.....................................
 
IT Support

.....................................
 
About Queen's

.....................................
 
About Kingston

.....................................

Undergrad Studies

............................................

Graduate Studies

............................................

Research Groups

............................................

Faculty & Staff

............................................

Alumni & Friends

............................................

Visitors & Residents

............................................

Queen's Observatory

............................................

 
 Upcoming Talks        Past Talks        Calendar View

Departmental Colloquium


Exploring Quantum Nature of Electrons by Scanning Probe Microscopy

Yoshinori Suganuma
Dept of Chemistry, University of Toronto

Time
 
Fri. February 27, 2004     12:30 PM     Stirling A

Abstract
 
Electrons have wave-particle duality. This is well pronounced at an ultra-small scale. In this talk, we will explore this behaviour using scanning probe microscopy (SPM). This unique microscope allows us to image small structures down to atomic scale, and can be used for characterizing their physical properties.

Electrons can get confined in a vacuum gap between two conductive surfaces of a scanning tunneling microscope (STM). These electrons can interfere and form standing waves in the vacuum gap of the STM, which is analogous to “a particle in a box” in quantum mechanics. The corresponding energy levels for these standing waves can be measured via increase of tunneling current. An STM can be used as a novel tool for a surface potential evaluation because the positions of the energy levels are greatly sensitive to the surface potential.

When electrons tunnel through a potential barrier, they can only tunnel by units of e. By embedding a metallic nanoparticle between two tunnel barriers, a nanoparticle can be charged with single electrons. Single electron charges give rise to discrete force changes, which can be measured by a hybrid scanning tunneling – atomic force microscope (STM-AFM).

SPM can also be used for constructing/modifying small artificial structures. These structures not only provide a test bed for quantum mechanics, but may also provide a way to overcome optical lithographical limits.

Dr Suganuma is an applicant for the Engineering Physics position recently advertised within the Department. Refreshments will be available after the talk.

List of upcoming talks and colloquia

Calendar for the current month



  Back to top
©2013 Department of Physics, Engineering Physics & Astronomy
Queen's University
Kingston, Ontario
K7L 3N6 Canada
Web Inquiries
webmaster@physics.queensu.ca
Departmental Inquiries
dept@physics.queensu.ca