651 citations · 1.3k across the 22 of their papers we have counts for
23 papers
Relativistic Effects in LaBi Thin Films
Reiley Dorrian, Sungmin Song, Jinwoong Kim +4
Chemical substitution in crystalline quantum materials is a powerful way to explore the consequences of strong spin-orbit coupling on their structural and electronic properties. In…
Study of vacancy ordering and the boson peak in metastable cubic Ge-Sb-Te using machine learning potentials
Young-Jae Choi, Minjae Ghim, Seung-Hoon Jhi
The mechanism of the vacancy ordering in metastable cubic Ge-Sb-Te (c-GST) that underlies the ultrafast phase-change dynamics and prominent thermoelectric properties remains elusiv…
Divergent phonon angular momentum driven by temperature and strain
Young-Jae Choi, Seung-Hoon Jhi
The phonon angular momentum (PAM) may exhibit exotic temperature dependence as it is sensitive to the phonon lifetime. Constant phonon-lifetime approximation fails to depict such b…
Lattice dynamical properties of antiferromagnetic oxides calculated using self-consistent extended Hubbard functional method
Wooil Yang, Bo Gyu Jang, Young-Woo Son +1
We study the lattice dynamics of antiferromagnetic transition-metal oxides by using self-consistent Hubbard functionals. We calculate the ground states of the oxides with the on-si…
Intersite Coulomb Interactions in Charge Ordered Systems
Bo Gyu Jang, Minjae Kim, Sang-Hoon Lee +3
Using {\it ab initio} approaches for extended Hubbard interactions coupled to phonons, we reveal that the intersite Coulomb interaction plays important roles in determining various…
Ab initio study of lattice dynamics of group IV semiconductors using pseudohybrid functionals for extended Hubbard interactions
Wooil Yang, Seung-Hoon Jhi, Sang-Hoon Lee +1
We study the lattice dynamics of group IV semiconductors using fully ab-initio extended Hubbard functional. The onsite and intersite Hubbard interactions are determined self-consis…
Coexistence of spontaneous polarization and superconductivity in hole-doped oxyhydrides ATiO_2H (A=K, Rb, Cs): first-principles study
Minjae Ghim, Nobuya Sato, Ryosuke Akashi +2
The polar metal is a material that hosts both polar distortion and metallicity. Such a material is expected to show exotic magneto-electric phenomena if superconducts. Here, we the…
Weyl node assisted conductivity switch in interfacial phase change memory with van der Waals interfaces
Jinwoong Kim, Jeongwoo Kim, Young-Sun Song +3
The interfacial phase-change memory (iPCM) GeTe/Sb2Te3, promising candidates for the next generation non-volatile random-access memories, exhibits fascinating topological propertie…
Topological phase transition and quantum spin Hall edge states of antimony few layers
Sung Hwan Kim, Kyung-Hwan Jin, Joonbum Park +3
While two-dimensional topological insulators (2D TI) initiated the field of topological materials, only very few materials were discovered to date and the direct access to their qu…
Quantum electronic transport of topological surface states in beta-Ag2Se nanowire
Jihwan Kim, Ahreum Hwang, Sang-Hoon Lee +8
Single-crystalline β-Ag2Se nanostructures, a new class of 3D topological insulators (TIs), were synthesized using the chemical vapor transport method. The topological surface state…
Proximity Effect Induced Electronic Properties of Epitaxial Graphene on Bi2Te2Se
Paengro Lee, Kyung-Hwan Jin, Si Jin Sung +10
We report that the π-electrons of graphene can be spin-polarized to create a phase with a significant spin-orbit gap at the Dirac point (DP) using a graphene-interfaced topological…
Topological fate of edge states of Bi single bilayer on Bi(111)
Han Woong Yeom, Kyung-Hwan Jin, Seung-Hoon Jhi
We address the topological nature of electronic states of step edges of Bi(111) films by first principles band structure calculations. We confirm that the dispersion of step edge s…
Transforming a Surface State of Topological Insulator by a Bi Capping Layer
Han Woong Yeom, Sung Hwan Kim, Woo Jong Shin +7
We introduce a dinstint approach to engineer a topologically protected surface state of a topological insulator. By covering the surface of a topological insulator, Bi2Te2Se, with…
Edge and Interfacial States in a 2D Topological Insulator:Bi(111) Bilayer on BiTeSe
Sung Hwan Kim, Kyung-Hwan Jin, Joonbum Park +4
The electronic states of a single Bi(111) bilayer and its edges, suggested as a two dimensional topological insulator, are investigated by scanning tunneling spectroscopy (STS) and…
Phonon-induced topological insulating phases in group IV-VI semiconductors
Jinwoong Kim, Seung-Hoon Jhi
Development of topological insulating phases in IV-VI compounds under dynamic lattice deformations is studied using first-principles methods. Unlike the static state of topological…
Anomalous Optical Phonon Splittings in Sliding Bilayer Graphene
Seon-Myeong Choi, Seung-Hoon Jhi, Young-Woo Son
We study the variations of electron-phonon coupling and their spectroscopic consequences in response to sliding of two layers in bilayer graphene using first-principles calculation…
Spin-Chiral Bulk Fermi Surfaces of BiTeI Proven by Quantum Oscillations
Joonbum Park, E. Kampert, Kyung-Hwan Jin +10
We present the Fermi-surface map of the spin-chiral bulk states for the non-centrosymmetric semiconductor BiTeI using de Haas-van Alphen and Shubnikov-de Haas oscillations. We iden…
Proximity-induced giant spin-orbit interaction in epitaxial graphene on topological insulator
Kyung-Hwan Jin, Seung-Hoon Jhi
Heterostructures of Dirac materials such as graphene and topological insulators provide interesting platforms to explore exotic quantum states of electrons in solids. Here we study…
Topological phase transition in Dirac fermionic heterostructures
Jeongwoo Kim, Jinwoong Kim, Ki-Seok Kim +1
Materials with non-trivial topology in their electronic structures enforce the existence of helical Dirac fermionic surface states. We discovered emergent topological phases in the…
The stability of graphene band structures against an external periodic perturbation; Na on Graphene
Choongyu Hwang, Sunyoung Shin, Seon-Myeong Choi +7
We report that the band of graphene sensitively changes as a function of an external potential induced by Na especially when the potential becomes periodic at low temperature.…
Electronic topological transition in sliding bilayer graphene
Young-Woo Son, Seon-Myeong Choi, Yoon Pyo Hong +2
We demonstrate theoretically that the topology of energy bands and Fermi surface in bilayer graphene undergoes a very sensitive transition when extremely tiny lateral interlayer sh…
Controlling Energy Gap of Bilayer Graphene by Strain
Seon-Myeong Choi, Seung-Hoon Jhi, Young-Woo Son
Using the first principles calculations, we show that mechanically tunable electronic energy gap is realizable in bilayer graphene if different homogeneous strains are applied to t…
Effects of Strain on Electronic Properties of Graphene
Seon-Myeong Choi, Seung-Hoon Jhi, Young-Woo Son
We present first-principles calculations of electronic properties of graphene under uniaxial and isotropic strains, respectively. The semi-metallic nature is shown to persist up to…