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Reprogrammable Quantum Materials

Yang, Dengyu (2023) Reprogrammable Quantum Materials. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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As a three-dimensional creature living in a three-dimensional world, the study of low-dimensional physics can help us understand the fundamental laws of nature. I focus on van der Waals (vdW) materials and reconfigurable complex oxide two-dimensional systems because they show great potential to support quantum science by providing abundant properties. In this thesis, I show my efforts to establish a new method to create reconfigurable nanostructures at complex oxide interfaces (Chapter III), called ultra-low voltage electron-beam lithography (ULV-EBL). Compared to previous reports that utilize conductive atomic force microscope (c-AFM) lithography, this approach can provide a comparable resolution (10 nm) at write speeds (10 mm/s) that are up to 10,000 faster than c-AFM. The writing technique is non-destructive, and the conductive state is reversible via prolonged exposure to air. I demonstrate how reprogrammable quantum materials can be achieved by gating vdW stacks with reprogrammable complex-oxide heterostructures ULV-EBL (Chapter IV). This technique for nanoscale gating of vdW materials has the potential for instantiating a wide range of 2D Fermi-Hubbard models and for creating emergent properties such as novel magnetic and superconducting phases. The ability to use ULV-EBL to switch the ferroelectric domain and pattern ferroelectric nanostructures (Chapter V) is shown. For efforts toward quantum sensing, the surface acoustic wave (SAW) is used to detect phase transitions of the quantum paraelectric regime and is shown to be coupled with ferroelastic domains (Chapter VI). The introduction and methodologies are described in Chapter I and Chapter II. In Chapter VII, I make conclusive remarks and discuss future prospects.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Yang, Dengyudey15@pitt.edudey150000-0002-8282-9618
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairLevy,
Committee MemberHatridge,
Committee MemberMong,
Committee MemberHunt,
Committee MemberHan,
Thesis AdvisorLevy,
Date: 28 February 2023
Date Type: Publication
Defense Date: 30 November 2022
Approval Date: 28 February 2023
Submission Date: 2 December 2022
Access Restriction: 2 year -- Restrict access to University of Pittsburgh for a period of 2 years.
Number of Pages: 135
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: quantum materials, oxides, graphene, ferroelectric, surface acoustic wave
Date Deposited: 28 Feb 2023 13:24
Last Modified: 28 Feb 2023 13:24

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