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XINYI DU
EXPERIENCE & EDUCATION
Roles & Academic Institutions
PHD
September 2018 — May 2025
Washington University in St.Louis
Condense matter physics
2D material, Microwave circuit, Superconductor
BS
September 2014 - August 2018
Huazhong University of Science and Technology
Applied Physics
In my current position as a Postdoctoral Researcher at the Cornell NanoScale Science and Technology Facility (CNF), I am focused on quantum device fabrication infrastructure, specifically baselining tools for the production of Josephson junction (JJ) qubits. My work includes process development and qualification of advanced deposition systems such as the Angstrom Quantum E-Beam Evaporator and the AJA Quantum Sputtering Tool, enabling the reliable fabrication of superconducting circuits for next-generation quantum processors.
During my PhD at the Henriksen Lab, my research centered on quantum transport phenomena in low-dimensional materials, particularly focusing on microwave resonator design and nanofabrication techniques. I developed and characterized GHz-range coplanar waveguide resonators made from Niobium and Molybdenum-Rhenium (MoRe). These resonators were employed with graphene devices to probe compressibility and explore the potential application as a broadband single-photon detector.
Nanofabrication & Sample Preparation:
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Specializing in quantum device fabrication using superconducting materials such as Nb, Al, and MoRe.
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Qualified in exfoliation, heterostructure stacking, and nanolithography techniques.
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Currently baselining and optimizing high-precision JJ fabrication tools at CNF (Angstrom E-beam Quantum, AJA Sputter Quantum).
Cleanroom Operations & Characterization Tools:
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Over 6 years of hands-on cleanroom experience: E-beam lithography, Reactive Ion Etching, Physical Vapor Deposition (PVD), and superconducting metal processing.
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Characterization expertise in AFM, PPMS, Probe Station, ICE-T (Integrated Cryogenic Electronics Test), and S-parameter microwave analysis.
Equipment Setup & Programming:
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Developed automated Python-based HFSS modeler and DXF generator for consistent design-to-fab pipeline: Simple SIM
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Created data acquisition framework in Python: Simple DAQ
Research Projects:
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Designed and modeled hanger and half-wave CPW resonators to study Nb and MoRe resonators with tunable coupling and extracted quality factors.
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Investigated anomalous absorption dips due to slotline/cavity modes, leading to design improvements and validated with HFSS simulations.
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Measured quantum capacitance in graphene through transmission resonator coupling.
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Collaborated on ESR detection and nuclear polarization experiments using isotopically purified hBN boron vacancies.
Talks
Xinyi Du
Xinyi Du
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APS March Meeting 2024_W54_Isotope engineering of VB-
13:22
APS March Meeting 2023_A20_Graphene Devices
10:18
SELECTED PUBLICATIONS
Nat Commun 15, 104 (2024)
Ruotian Gong*, Xinyi Du*, Eli Janzen, Vincent Liu, Zhongyuan Liu, Guanghui He, Bingtian Ye, Tongcang Li, James H. Edgar, Erik A. Henriksen, Chong Zu.
Appl. Phys. Lett. 120, 102601 (2022)
K. Zheng, D. Kowsari, N. J. Thobaben, X. Du, X. Song, S. Ran, E. A. Henriksen, D. S. Wisbey, and K. W. Murch.
Appl. Phys. Lett. 119, 132601 (2021)
D. Kowsari, K. Zheng, J. Monroe, N. Thobaben, X. Du, P. Harrington, E. A. Henriksen, D. Wisbey, and K. Murch
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