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Oxide Heterostructures for Quantum Magnetism
Changhee Sohn 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.2
Magnetism with strong quantum fluctuation and entanglement has received rising attention due to its exotic excitations and potential application to spintronics and quantum computations. However, realizing genuine quantum magnetic ground state in real matter remains extremely challenging up to now. In almost every candidate for Kitaev quantum spin liquid, for example, the presence of additional spin exchange interaction results in classical long-range antiferromagnetic ground states. In this regard, heterostructure approach on quantum magnet might provide a unique route to realize quantum magnetism owing to its wide tunability of spin Hamiltonian. Here, we will introduce our recent attempt to realize quantum magnetic ground states in strongly correlated oxide heterostructures. We will present successful growth of quantum spin liquid candidates in thin film geometry and its basic characterization including structure, stoichiometry, electronic and magnetic ground states. The similarity and difference between bulk and thin film will be discussed.
Charge Transfer in Iridate-Manganite Superlattices
Okamoto, Satoshi,Nichols, John,Sohn, Changhee,Kim, So Yeun,Noh, Tae Won,Lee, Ho Nyung American Chemical Society 2017 NANO LETTERS Vol.17 No.4
<P>Charge transfer in superlattices consisting of SrIrO3 and SrMnO3 is investigated using density functional theory. Despite the nearly identical work function and nonpolar interfaces between SrIrO3 and SrMnO3, rather large charge transfer was experimentally reported at the interface between them. Here, we report a microscopic model that captures the mechanism behind this phenomenon, providing a qualitative understanding of the experimental observation. This leads to unique strain dependence of such charge transfer in iridate-manganite superlattices. The predicted behavior is consistently verified by experiment with soft X-ray and optical spectroscopy. Our work thus demonstrates a new route to control electronic states in nonpolar oxide heterostructures.</P>