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Reconfigurable graphene complex oxide nanostructures

Guo, Qing (2020) Reconfigurable graphene complex oxide nanostructures. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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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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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Guo, Qingqig7@pitt.eduqig7
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairLevy, Jeremyjlevy@pitt.edujlevy
Committee MemberPetek, Hrvojepetek@pitt.edupetek
Committee MemberMong, Rogerrmong@pitt.edurmong
Committee MemberBadenes, Carlosbadenes@pitt.edubadenes
Committee MemberFullerton, Susanfullerton@pitt.edufullerton
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


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