Atom manipulation-enhanced quasiparticle interference : accessing band structure, pseudospin and landau levels
Abstract/Contents
- Abstract
- We have developed a method to investigate electron wavefunction using scanning tunneling microscope (STM). By imaging the defects in a condensed matter system, one can measure the properties of wavefunctions solely based on the density of state. For example, our method probes the electronic dispersion which is unavailable otherwise because the crystal momentum is encoded in the phase of a Bloch wave. We aim to study electronic structures with a spatial resolution that is beyond the reach of transport measurements which are limited by the size of electrical contacts, and optical methods which are limited by the size of optical beams. With atom manipulation, we further extend the method to study the inner degree of freedom of a wavefunction such as pseudospin. Electrons scatter differently upon defects with different symmetry. By designing the symmetry of defects using atom manipulation, we measure pseudospin and pseudospin selection rule based on the interference patterns of electron scattering around different defects. In this thesis, I first derive the relation between wavefunctions and scattering patterns from the first principle. This theory is then validated in experiments with quantum corrals that host well-understood particle-in-a-box wavefunctions. All experiments are conducted on nanostructures and lattices created by patterning the two-dimensional electronic surface state of the Cu(111) surface with carbon monoxide (CO) molecules. I then apply the method to several quantum materials, including graphene and quasicrystals, to study their electronic structures. Finally, I present studies that relate to quantum scattering of two-dimensional electrons, including a Fermionic Casimir force and an inverse scattering problem.
Description
| Type of resource | text |
|---|---|
| Form | electronic resource; remote; computer; online resource |
| Extent | 1 online resource. |
| Place | California |
| Place | [Stanford, California] |
| Publisher | [Stanford University] |
| Copyright date | 2021; ©2021 |
| Publication date | 2021; 2021 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Chen, Yi-Ting (Tim) |
|---|---|
| Degree supervisor | Kasevich, Mark A |
| Degree supervisor | Manoharan, Harindran C. (Harindran Chelvasekaran), 1969- |
| Thesis advisor | Kasevich, Mark A |
| Thesis advisor | Manoharan, Harindran C. (Harindran Chelvasekaran), 1969- |
| Thesis advisor | Devereaux, Thomas Peter, 1964- |
| Degree committee member | Devereaux, Thomas Peter, 1964- |
| Associated with | Stanford University, Department of Applied Physics |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Yi-Ting Chen. |
|---|---|
| Note | Submitted to the Department of Applied Physics. |
| Thesis | Thesis Ph.D. Stanford University 2021. |
| Location | https://purl.stanford.edu/sz547qy9526 |
Access conditions
- Copyright
- © 2021 by Yi-Ting Chen
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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