Link to the University of Pittsburgh Homepage
Link to the University Library System Homepage Link to the Contact Us Form


Li, Jianan (2019) GRAPHENE-COMPLEX OXIDE HETEROSTRUCTURE. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

Download (17MB) | Preview


Graphene and complex-oxide heterostructures are both 2D systems that have initiated numerous research areas. The two-dimensional electron gas (2DEG) in both systems differs in many ways from traditional semiconductor materials. This research is dedicated to integrating these two versatile systems. Conventionally, the transfer of graphene grown by chemical vapor deposition is assisted by poly(methyl methacrylate) (PMMA). A new transfer method is developed in this research and can protect the graphene against contaminations. The graphene transferred onto the complex-oxide heterostructure substrates using such method is atomically clean with high mobility. Conductive atomic force microscope (c-AFM) writing technique is applied to graphene-complex-oxide heterostructure to reversibly control the charge-neutrality point (CNP) with nanoscale resolution, utilizing the tunability of the complex-oxide substrate. The local electron density and conductivity of the complex-oxide heterostructure interface can be patterned with the c-AFM tip, and the CNP of the proximal graphene is shifted. With this effect, the mixing of edge state in quantum Hall regime on the edge of graphene p-n junctions can be reversibly controlled. Quantization of resistance is observed as a result of the mixing at low temperature, depending on the directions of currents and magnetic fields. Nanoscale devices such as superlattices can also be produced on various two-dimensional material heterostructure by combining these two techniques.


Social Networking:
Share |


Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Li, Jiananjil128@pitt.edujil1280000-0003-4532-3797
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairLevy, Jeremyjlevy@pitt.edujlevy
Committee MemberDutt, Gurudevgdutt@pitt.edugdutt
Committee MemberLiu, Vincentwvliu@pitt.eduwvliu
Committee MemberLeibovich, Adamakl2@pitt.eduakl2
Committee MemberXiao,
Date: 27 September 2019
Date Type: Publication
Defense Date: 15 April 2019
Approval Date: 27 September 2019
Submission Date: 7 April 2019
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Number of Pages: 156
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: Graphene, oxide, nanotechnology
Date Deposited: 27 Sep 2019 15:49
Last Modified: 27 Sep 2019 15:49


Monthly Views for the past 3 years

Plum Analytics

Actions (login required)

View Item View Item