Local imaging of high mobility two-dimensional electron systems with virtual scanning tunneling microscopy
Abstract/Contents
- Abstract
- Correlated electron states in high mobility two-dimensional electron systems (2DESs), including charge density waves and microemulsion phases intermediate between a Fermi liquid and Wigner crystal, are predicted to exhibit complex local charge order, but are not yet well understood. Properties of correlated states in 2D have traditionally been studied using bulk electrical transport measurements, which tend to reflect a spatially averaged response of the system, but can obscure any local ordering phenomena that may be occurring. Scanning probes are well suited to study these systems on a short length scale, but developing useful scanning probe techniques has been difficult due to the fact that high mobility 2DESs are found at buried semiconductor interfaces, typically in the GaAs/AlGaAs materials system. This difficulty can be overcome by using a new scanning technique called "virtual scanning tunneling microscopy" (VSTM) that allows for local tunneling into a high mobility 2DES. This is achieved using a specially designed bilayer GaAs/AlGaAs heterostructure where the tunnel coupling between two separate 2DESs is tunable via electrostatic gating. Scanning gate microscopy measurements on these samples will be presented, which show that the local tunneling can be controlled on a length scale approaching the Fermi wavelength, as well as an overview of the scanning system built to carry out these measurements in a cryogen-free dilution refrigerator, which is able to achieve electron temperatures down to 45 mK.
Description
| Type of resource | text |
|---|---|
| Form | electronic; electronic resource; remote |
| Extent | 1 online resource. |
| Publication date | 2013 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Associated with | Pelliccione, Matthew |
|---|---|
| Associated with | Stanford University, Department of Applied Physics. |
| Primary advisor | Goldhaber-Gordon, David, 1972- |
| Primary advisor | Moler, Kathryn A |
| Thesis advisor | Goldhaber-Gordon, David, 1972- |
| Thesis advisor | Moler, Kathryn A |
| Thesis advisor | Qi, Xiaoliang |
| Advisor | Qi, Xiaoliang |
Subjects
| Genre | Theses |
|---|
Bibliographic information
| Statement of responsibility | Matthew Pelliccione. |
|---|---|
| Note | Submitted to the Department of Applied Physics. |
| Thesis | Thesis (Ph.D.)--Stanford University, 2013. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2013 by Matthew Joseph Pelliccione
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
Also listed in
Loading usage metrics...