https://scholar.dgist.ac.kr/handle/20.500.11750/10042 2026-04-27T02:30:33Z 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. https://scholar.dgist.ac.kr/handle/20.500.11750/59364 Title: Correlated Interlayer Quantum Hall State in Large-Angle Twisted Trilayer Graphene Author(s): Kim, Dohun; Lee, Gyeoul; Leconte, Nicolas; Jin, Seyoung; Taniguchi, Takashi; Watanabe, Kenji; Jung, Jeil; Cho, Gil Young; Kim, Youngwook Abstract: Trilayer graphene offers systematic control of its electronic structure through the stacking sequence and twist geometry, providing a versatile platform for correlated states. Here we report magnetotransport in a large-angle twisted trilayer graphene with a twist angle of about 5 degrees. The data reveal an electron-hole asymmetry that can be captured by introducing layer-dependent potential shifts. At charge neutrality (nu tot = 0), three low-resistance states appear, which Hartree-Fock mean-field analysis attributes to spin-resolved helical edge modes in the quantum Hall regime, analogous to quantum spin Hall-like configurations. At nu tot = -1, we also observe suppressed resistance when the middle and bottom layers are each half filled, while the top layer remains inert at nu = -2, consistent with an interlayer excitonic phase in the quantum Hall regime. These results demonstrate correlated interlayer quantum Hall phases in large-angle twisted trilayer graphene by combining spin-resolved helical edge transport with excitonic order. 2025-12-31T15:00:00Z