A5029405468- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- 2D Materials and Applications
- Multiferroics and related materials
- Topological Materials and Phenomena
- Physics of Superconductivity and Magnetism
- Organic and Molecular Conductors Research
- Quantum and electron transport phenomena
- Graphene research and applications
- Magnetic and transport properties of perovskites and related materials
- Advanced Condensed Matter Physics
- Mathematical Analysis and Transform Methods
- Electronic and Structural Properties of Oxides
- Metal-Organic Frameworks: Synthesis and Applications
- Perovskite Materials and Applications
- Magnetism in coordination complexes
- Magnetic properties of thin films
- Crystal Structures and Properties
- Magnetic Properties and Applications
- Magnetic Field Sensors Techniques
Korea Institute for Advanced Study
2023-2025
Seoul National University
2021-2023
We propose a novel ferroelectric switchable altermagnetism effect: the reversal of polarization is coupled to switching altermagnetic spin splitting. demonstrate design principles for altermagnets and additional symmetry constraints necessary splitting through flipping electric based on state-of-the-art spin-group techniques. find 22 by screening 2001 experimental reported magnetic structures in MAGNDATA database identify two them as altermagnets. Using hybrid improper material...
The reduced symmetry in strong spin-orbit coupling materials such as transition metal ditellurides (TMDTs) gives rise to non-trivial topology, unique spin texture, and large charge-to-spin conversion efficiencies. Bilayer TMDTs are non-centrosymmetric have topological properties compared monolayer or trilayer, but a controllable way prepare bilayer MoTe2 crystal has not been achieved date. Herein, we achieve the layer-by-layer growth of large-area trilayer 1T' single crystals...
The authors report here the discovery of a realistic platform for emerging non-Abelian fractional quantum anomalous Hall states. This is second moir\'e band in 2-degree twisted bilayer MoTe${}_{2}$. They elucidate theoretical foundation behind this by demonstrating resemblance to first Landau level, using Haldane pseudopotentials and Fubini-Study metric. A surprising similarity revealed between sequence bands MoTe${}_{2}$ levels beyond particular band.
We studied the magneto-optical Kerr effect (MOKE) of two-dimensional (2D) heterostructure CrI3/In2Se3/CrI3 using density functional theory calculations and symmetry analysis. The spontaneous polarization in In2Se3 ferroelectric layer antiferromagnetic ordering CrI3 layers break mirror time-reversal symmetry, thus activating MOKE. show that angle can be reversed by either or order parameter. Our results suggest 2D heterostructures could exploited for ultracompact information storage devices,...
The interlayer van der Waals interaction in twisted bilayer graphene (tBLG) induces both in-plane and out-of-plane atomic displacements showing complex patterns that depend on the twist angle. In particular, for small angles, within each layer, relaxations give rise to a vortexlike displacement pattern which is known affect dispersion of flat bands. Here, we focus yet another structural property, chirality bilayer. We perform first-principles calculations based density functional theory...
We report for the first time synthesis of [C(NH2)3]Cr(HCOO)3 stabilizing Cr2+ in formate perovskite, which adopts a polar structure and orders magnetically below 8 K. discuss detail magnetic properties their coupling to crystal based on first-principles calculations, symmetry, model Hamiltonian analysis. establish general orbital moment [C(NH2)3]M(HCOO)3 (M = Cr, Cu) perturbation theory, revealing key role Jahn-Teller distortions. also analyze spin textures k-space, show unique characteristics.
We propose a novel ferroelectric switchable altermagnetism effect, the reversal of polarization is coupled to switching altermagnetic spin splitting. demonstrate design principles for altermagnets and additional symmetry constraints necessary splitting through flipping electric based on state-of-the-art spin-group techniques. 22 are found by screening 2001 experimental reported magnetic structures in MAGNDATA database 2 them identified as altermagnets. Using hybrid improper material...
Twisting in bilayers introduces structural chirality with two enantiomers, i.e., left- and right-hand bilayers, depending on the oriented twist angle. The interplay between this global additional degrees of freedom, such as magnetic ordering local octahedral arising from geometry bonds, can yield striking phenomena. In work, we focus collinear antiferromagnetic CrI$_3$ twisted homo-bilayers, which are characterized by a staggered each monolayer. Using symmetry analysis, density functional...
Imposing incommensurable periodicity on the periodic atomic lattice can lead to complex structural phases consisting of locally structure bounded by topological defects. Twisted trilayer graphene (TTG) is an ideal material platform study interplay between different periodicities, which be tuned twist angles layers, leading moir\'e-of-moir\'e lattices. Interlayer and intralayer interactions two interfaces in TTG transform this into intricate network domain structures at small angles, harbor...
The recent experimental discovery of the fractional quantum spin Hall effect in twisted bilayer MoTe$_2$ at a twist angle 2.1 degrees highlights unique properties its second moir\'e band. Inspired by this finding, we conduct comprehensive theoretical investigation half-filled band angle, utilizing an effective continuum model. Our analysis reveals that not only exhibits characteristics akin to first Landau level, $K=\int_\mathrm{BZ}\mathrm{d}^2\mathbf{k}\:\mathrm{tr}\:\eta(\mathbf{k})...
We study the magneto-optical Kerr effect (MOKE) of two-dimensional heterostructure CrI3/In2Se3/CrI3 by using density functional theory calculations and symmetry analysis. The spontaneous polarization in In2Se3 ferroelectric layer antiferromagnetic ordering CrI3 layers break mirror timereversal symmetry, thus activating MOKE. show that angle can be switched either or order parameter. Our results suggest 2D heterostructures could exploited for ultra-compact information storage devices, where...
Metal-organic frameworks (MOFs) possess a hybrid nature, combining the inorganic properties from metal ions and organic molecular linkers. Stroppa, \textit{et al.}, showed that perovskite-type MOF [C(NH$_2$)$_3$]M[(HCOO)$_3$] (M = Cr, Cu) exhibits magneto-electric coupled multiferroicity [Angew. Chem. Int. Ed. 50, 5847 (2011) Adv. Mater. 25, 2284 (2013)]. Moreover, their ferroelectricity arises improper mechanism, which also explains coupling. In this work, we further examine electric...
Twisting in bilayers introduces structural chirality with two enantiomers, i.e., left- and right-hand bilayers, depending on the oriented twist angle. The interplay between this global additional degrees of freedom, such as magnetic ordering local octahedral arising from geometry bonds, can yield striking phenomena. In work, we focus collinear antiferromagnetic CrI$_3$ twisted homo-bilayers, which are characterized by a staggered each monolayer. Using symmetry analysis, density functional...