https://scholar.dgist.ac.kr/handle/20.500.11750/10042 2026-04-05T09:51:52Z 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 https://scholar.dgist.ac.kr/handle/20.500.11750/58219 Title: Observation of 1/3 fractional quantum Hall physics in balanced large angle twisted bilayer graphene Author(s): Kim, Dohun; Jin, Seyoung; Taniguchi, Takashi; Watanabe, Kenji; Smet, Jurgen H.; Cho, Gil Young; Kim, Youngwook Abstract: Magnetotransport of conventional semiconductor based double layer systems with barrier suppressed interlayer tunneling has been a rewarding subject due to the emergence of an interlayer coherent state that behaves as an excitonic superfluid. Large angle twisted bilayer graphene offers unprecedented strong interlayer Coulomb interaction, since both layer thickness and layer spacing are of atomic scale and a barrier is no more needed as the twist induced momentum mismatch suppresses tunneling. The extra valley degree of freedom also adds richness. Here we report the observation of fractional quantum Hall physics at 1/3 total filling for balanced layer population in this system. Monte Carlo simulations support that the ground state is also an excitonic superfluid but the excitons are composed of fractional rather than elementary charges. The observed phase transitions with an applied displacement field at this and other fractional fillings are also addressed with simulations. They reveal ground states with different topology and symmetry properties. © The Author(s) 2024. 2024-12-31T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/57379 Title: Breaking barriers by interfacial charge transfer Author(s): Kim, Youngwook Abstract: The issue of ohmic contact in WSe2 has been effectively addressed through a significant charge transfer mechanism enabled by the RuCl3/WSe2 heterostructure. © Springer Nature Limited 2024. 2024-06-30T15:00:00Z