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Strain Responses And Transport Properties in Strontium Titanate-based Complex Oxide Devices

Wu, Xinyi (2023) Strain Responses And Transport Properties in Strontium Titanate-based Complex Oxide Devices. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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Abstract

In this thesis, I summarize my work in mesoscale devices created in strontium titanate (SrTiO3)-based heterostructures, seeking to deepen the understanding of superconductivity and electron-pairing in those materials. In Chapter 1, relevant advances in the field of SrTiO3, lanthanum aluminate and strontium titanate (LaAlO3/SrTiO3), and samarium titanate and strontium titanate (SmTiO3/SrTiO3/SmTiO3) quantum wells are reviewed. In Chapter 2, a brief introduction to relevant experimental setups and techniques is provided, from nano-fabrication procedures for mesoscale devices to our efforts on the application of uniaxial strain at cryogenic temperatures, while at the same time performing transport measurements. In Chapter 3, I summarize our observations of the quasi-particle excitation using voltage or optical disturbances in SmTiO3/SrTiO3/SmTiO3 quantum wells in the pseudogap phase. In Chapter 4, results demonstrating the effects of uniaxial strain on superconductivity in quantum wires at the LaAlO3/SrTiO3 interface created using conductive atomic force microscopy (c-AFM) are summarized. Both hysteretic and non-hysteretic responses to the strain in the system are closely examined. Future research efforts and an outlook for this field are presented in Chapter 5.

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Item Type: University of Pittsburgh ETD
Status: Unpublished
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Wu, XinyiXIW107@PITT.EDUxiw107
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairLevy, Jeremyjlevy@pitt.edu
Committee MemberHatridge, Michaelhatridge@pitt.edu
Committee MemberHan, Taothan@pitt.edu
Committee MemberWaldeck, Daviddave@pitt.edu
Committee MemberMong, Rogerrmong@pitt.edu
Date: 26 January 2023
Date Type: Publication
Defense Date: 15 November 2022
Approval Date: 26 January 2023
Submission Date: 24 November 2022
Access Restriction: 1 year -- Restrict access to University of Pittsburgh for a period of 1 year.
Number of Pages: 138
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: Condensed Matter Physics, Superconductivity, Pseudogap, Oxide Hetereostructures
Date Deposited: 26 Jan 2023 15:28
Last Modified: 26 Jan 2024 06:15
URI: http://d-scholarship.pitt.edu/id/eprint/43963

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