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### Zhiyuan Sophomore Yuyang Zhang Makes Breakthrough in Quantum Conductance Memristor Study at Zhiyuan College
2026-01-19
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Yuyang Zhang, a sophomore majoring in Physics (Class of 2023), has made notable progress in the field of quantum transport and novel information devices. His work as the first author has been published in the prestigious journal Applied Physics Reviews (DOI: 10.1063/5.0296500).
The research focuses on quantum conductance memristors, which are pivotal for bridging fundamental condensed matter physics and future technologies like neuromorphic computing and non-volatile memory. At the atomic scale, these devices exhibit discrete quantum conductance steps, offering a promising platform for both low-dimensional quantum transport studies and the development of advanced memory systems.
Addressing key challenges such as the random formation and instability of atomic conductive filaments, Zhang's study introduces a novel ITO/MoS₂–Ag/Pt multilayer device structure. By employing a non-reset voltage sweep strategy, the research successfully suppressed uncontrolled filament reconstruction. Under low compliance current, the device demonstrated stable and repeatable integer quantum conductance steps at multiples of G₀ (2e²/h), significantly reducing conductance fluctuations.
A further key finding is the light-modulated quantum transport in this non-magnetic system. Illumination altered the formation and distribution of conductance steps, stabilizing specific quantum states at lower voltages. This effect is attributed to the coupling between photogenerated carriers in MoS₂ and the Ag atomic filament, establishing light as an effective control parameter for quantum conductance.
This work systematically demonstrates a pathway for the controllable realization of quantum transport in memristors, enhancing the understanding of atomic-scale electronics and pointing toward stable multi-level quantum memory devices. Zhang’s research was conducted under the guidance of Professor Hui Wang at SJTU’s School of Physics and Astronomy. His training was supported by Zhiyuan College’s “Zhiyuan Future Scholars Program,” which fosters early research engagement. He also participated in a research internship at Caltech, further honing his scientific skills. In addition, Zhang attended the VURP research program at Professor Nai-Chang Yeh's research group at the California Institute of Technology. During this period, he participated in research on the coupling of twisted light fields and quantum transport in two-dimensional systems under low-temperature conditions, further enhancing his ability to independently analyze complex physical phenomena and construct physical models.
Yuyang Zhang plans to continue his research in quantum transport and two-dimensional materials, aiming to contribute original insights to both basic science and technological applications.
Link to paper: https://doi.org/10.1063/5.0296500
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