Guo, Qing
(2020)
Reconfigurable graphene complex oxide nanostructures.
Doctoral Dissertation, University of Pittsburgh.
(Unpublished)
Abstract
Graphene and complex-oxide heterostructures collectively exhibit nearly all of the known major properties in solid-state materials. Our goal is to integrate these two materials to create new emergent properties and functionalities. A new wet graphene transfer method is
developed and used to integrate graphene with the complex-oxide system LaAlO3/SrTiO3. Interactions between the graphene and LaAlO3/SrTiO3 interface are controlled at nanoscale dimensions using a conductive atomic force microscopy technique developed previously for the complex-oxide interface. The resulting hybrid structures exhibit novel and useful electronic and optical properties, many of which depend critically on controlling the chemical potential of graphene relative to the charge-neutrality point. The local density of states can be altered in graphene by programmable changes of the conductance of the complex oxide interface. In one experiment, an edge-mixed quantum Hall effect is observed in sketched graphene/complex-oxide p-n junction devices. Magnetotransport measurements of superlattice structures show characteristic interference features that can be associated with the periodically patterned interface. Coulomb drag measurements between single-layer graphene
and a conductive LaAlO3/SrTiO3 interface is also performed in these hybrid devices. The metallic behavior and high transparency of graphene make it an ideal top electrode for controlling magnetic properties at the LaAlO3/SrTiO3 interface. We discuss possible new directions based on this highly versatile hybrid material platform.
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Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
|
| Date: |
16 September 2020 |
| Date Type: |
Publication |
| Defense Date: |
29 May 2020 |
| Approval Date: |
16 September 2020 |
| Submission Date: |
30 July 2020 |
| Access Restriction: |
No restriction; Release the ETD for access worldwide immediately. |
| Number of Pages: |
129 |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Dietrich School of Arts and Sciences > Physics |
| Degree: |
PhD - Doctor of Philosophy |
| Thesis Type: |
Doctoral Dissertation |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
LAO/STO, Graphene, edge state, p-n junction, coulomb drag |
| Date Deposited: |
16 Sep 2020 13:56 |
| Last Modified: |
16 Sep 2020 13:56 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/39492 |
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