https://scholar.dgist.ac.kr/handle/20.500.11750/10042 2026-10-16T12:48:24Z https://scholar.dgist.ac.kr/handle/20.500.11750/60891 Title: Lessons from α-RuCl3 for pursuing quantum spin liquid physics in atomically thin materials Author(s): Ojeda-Aristizabal Claudia; Zheng Xiaohu; Xu Changsong; Nussinov Zohar; Motome Yukitoshi; Banerjee Arnab; Tsen Adam W.; Knap Michael; Du Rui-Rui; Joshi Gajadhar; Mounce Andy; Kim Youngwook; Hunt Benjamin M.; Shcherbakov Dmitry; Zhou Boyi; Jing Ran; Liu Mengkun; Zhao Hui; Claassen Martin; Erten Onur; Chen Yong P.; Henriksen Erik A. Abstract: Quantum spin liquids can arise from Kitaev magnetic interactions, and exhibit fractionalized excitations with the potential for a topological form of quantum computation. This review surveys recent experimental and theoretical progress on the pursuit of phenomena related to Kitaev magnetism in layered and exfoliatable materials, which offer numerous opportunities to apply powerful techniques from the field of atomically thin materials. We primarily focus on the antiferromagnetic Mott insulator alpha-RuCl3, which exhibits Kitaev couplings and is readily exfoliated to single- or few-layer sheets, and thus serves as a test bed for developing probes of Kitaev phenomena in atomically thin materials and devices. We introduce the Kitaev model and how it is realized in alpha-RuCl3 and other material candidates; and cover alpha-RuCl3 synthesis and fabrication into van der Waals heterostructure devices. A key discovery is a work-function-mediated charge transfer that heavily dopes both the alpha-RuCl3 and proximate materials, and can enhance Kitaev interactions by up to 50%. We further discuss a wide range of recent results in electronic transport and optical and tunneling spectroscopies of alpha-RuCl3 devices. The experimental techniques and theoretical insights developed for alpha-RuCl3 establish a framework for discovering and engineering superior two-dimensional Kitaev materials that may ultimately realize elusive quantum spin liquid phases. 2026-06-30T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/60253 Title: 이중층 그래핀 구조체 및 이를 제작하는 방법 Author(s): 김영욱; 조길영; 김도훈 https://scholar.dgist.ac.kr/handle/20.500.11750/60225 Title: Ferroelectric switching of interfacial dipoles in α-RuCl3/graphene heterostructure Author(s): Kim, Soyun; Yun, Jo Hyun; Choe, Junsik; Kim, Dohun; Taniguchi, Takashi; Watanabe, Kenji; Falson, Joseph; Kim, Jun Sung; Jin, Kyung-Hwan; Cho, Gil Young; Kim, Youngwook Abstract: We demonstrate electrically switchable, non-volatile dipoles in graphene/thin hBN/α-RuCl3 heterostructures, stabilized purely by interfacial charge transfer across an atomically thin dielectric barrier. This mechanism requires no sliding or twisting to explicitly break inversion symmetry and produces robust ferroelectric-like hysteresis loops that emerge prominently near 30 K. Systematic measurements under strong in-plane and out-of-plane magnetic fields reveal negligible effects on the hysteresis characteristics, confirming that the primary mechanism driving the dipole switching is electrostatic. Our findings establish a distinct and robust route to electrically tunable ferroelectric phenomena in van der Waals heterostructures, opening opportunities to explore the interplay between interfacial charge transfer and temperature-tuned barrier crossing of dipole states at the atomic scale. 2025-12-31T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/59882 Title: LC회로를 이용한 위상절연 양자메모리 Author(s): 브라이언 B. 조; 김영욱; 정민경 Abstract: 본 발명은 LC회로를 이용한 위상절연 양자메모리에 관한 것이다. 본 발명의 목적은, 위상절연에 의한 영에너지 상태를 이용하여 양자정보를 저장 및 회수할 수 있도록 하는, LC회로를 이용한 위상절연 양자메모리를 제공함에 있다. 보다 상세하게는, 초전도체 기판으로 이루어지는 LC회로 격자를 이용하여 위상상태(topological state) 원자체인을 모사구현하고, 이를 양자정보를 저장하는 구조로서 활용하는, LC회로를 이용한 위상절연 양자메모리를 제공함에 있다.