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Time Resolved Measurements of Dangling Bonds and Surface Structures Open Access


Other title
Dangling Bond
Scanning Tunneling Microscopy
Quantum Dot
Type of item
Degree grantor
University of Alberta
Author or creator
Lloyd, Erika A
Supervisor and department
Wolkow, Robert (Physics)
Examining committee member and department
Wolkow, Robert (Physics)
Maciejko, Joseph (Physics)
Beamish, John (Physics)
Tuszynski, Jack (Physics)
Department of Physics

Date accepted
Graduation date
2017-11:Fall 2017
Master of Science
Degree level
This thesis will discuss the charge dynamics of dangling bonds (DBs) on the hydrogen terminated Si(100) surface under the effects of temperature and perturbations from local electric fields. The experimental methods are then extended towards DB chains. Electronic time resolved imaging techniques have been developed to create fast images of electron capture on a single DB - showcasing the mechanism behind atomic Negative Differential Resistance (NDR). This feature and its associated dynamics are further explored with experiments at 77 K and room temperature. A pump probe imaging technique was implemented and used to spatially capture the (+/0) transition level coming in to resonance with the valence band. It will be shown that a DB is sensitive to local fields and, once characterized, the DB can be used as a tool to probe the native charge properties of other structures on the surface. Of particular interest will be a bare dimer and DB chains of various lengths. These chains are then explored using DC, dI/dV, and time resolved methods. A tangential effort on the Si(111)-H surface will be mentioned, and will present a 6 atom Si “benzene” structure. The advantages of a symmetric surface will be discussed, and it’s potentially useful 2x1 zig-zag reconstruction upon desorption of Hydrogen.
This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
Citation for previous publication
Mohammad Rashidi, Marco Taucer, Isil Ozfidan, Erika Lloyd, Mohammad Koleini, Hatem Labidi, Jason L. Pitters, Joseph Maciejko, and Robert A. Wolkow. “Time-Resolved Imaging of Negative Differential Resistance on the Atomic Scale.” In: Phys. Rev. Lett. 117 (27 2016), p. 276805. doi: 10.1103/ PhysRevLett . 117 . 276805. url: https : / / link . aps . org / doi / 10 . 1103 / PhysRevLett.117.276805.J.A. Wood, M. Rashidi, M. Koleini, J .L. Pitters, and R.A. Wolkow. “Multiple Silicon Atom Artificial Molecules.” In: ArXiv e-prints (2016). eprint: 1607 . 06050.

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File title: Abstract
File title: Time Resolved Measurments of Dangling Bonds and Surface Structures
File author: © Erika A. Lloyd, University of Alberta, Faculty of Science
File author: Erika A. Lloyd, University of Alberta, Faculty of Science
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