94 citations · 540 across the 20 of their papers we have counts for
21 papers
Finite-Rank Logistic Gaussian Processes with Exact Likelihood for Conditional Density Estimation
Jaehoan Kim, Indrajit Ghosh, Debdeep Pati +1
Conditional density estimation describes how the entire distribution of a response changes with covariates, and in imaging studies also with location. Logistic Gaussian processes (…
Magnetic wallpaper Dirac fermions and topological magnetic Dirac insulators
Yoonseok Hwang, Yuting Qian, Junha Kang +4
Topological crystalline insulators (TCIs) can host anomalous surface states which inherits the characteristics of crystalline symmetry that protects the bulk topology. Especially,…
Correlated normal state fermiology and topological superconductivity in UTe2
Hong Chul Choi, Seung Hun Lee, Bohm-Jung Yang
UTe2 is a promising candidate for spin-triplet superconductors, in which a paramagnetic normal state becomes superconducting due to spin fluctuations. The subsequent discovery of v…
DFT+DMFT study of dopant effect in a heavy fermion compound CeCoIn5
Hong Chul Choi, Eric D. Bauer, Filip Ronning +1
We study the dopant-induced inhomogeneity effect on the electronic properties of heavy fermionCeCoIn5using a combined approach of density functional theory (DFT) and dynamical mean…
Topological acoustic triple point
Sungjoon Park, Yoonseok Hwang, Hong Chul Choi +1
Acoustic phonon in a crystalline solid is a well-known and ubiquitous example of elementary excitation with a triple degeneracy in the band structure. Because of the Nambu-Goldston…
Orbital anisotropy of heavy fermion CeIrIn under crystalline electric field and its energy scale
Bo Gyu Jang, Beomjoon Goh, Junwon Kim Jae Nyeong Kim +5
We investigate the temperature ()-evolution of orbital anisotropy and its effect on spectral function and optical conductivity in CeIrIn, using a first principles dy…
Topological Phase Transition in an Archetypal f-electron Correlated System: Ce
Junwon Kim, Dongchoon Ryu, Chang-Jong Kang +4
A typical f-electron Kondo lattice system Ce exhibits the well-known isostructural transition, the so-called gamma-alpha transition, accompanied by an enormous volume collapse. Mos…
Observation of Dirac state in half-Heusler material YPtBi
M. Mofazzel Hosen, Gyanendra Dhakal, Klauss Dimitri +9
The prediction of non-trivial topological electronic states hosted by half-Heusler compounds makes them prime candidates for discovering new physics and devices as they harbor a va…
Dirac State in a Centrosymmetric Superconductor alpha-PdBi2
Klauss Dimitri, M. Mofazzel Hosen, Gyanendra Dhakal +6
Topological superconductor (TSC) hosting Majorana fermions has been established as a milestone that may shift our scientific trajectory from research to applications in topological…
Strong-Correlation Derived Spin-Fermion Model for Skyrmions in MnGe
Hongchul Choi, Yuan-Yen Tai, Jian-Xin Zhu
MnGe has been reported as a candidate of three-dimensional (3D) skyrmion crystal in comparison to the two-dimensional (2D) skyrmion observed in most other B20 compounds like MnSi.…
Low-Energy Surface States in the Normal State of -PdBi2 Superconductor
Hongchul Choi, Madhab Neupane, T. Sasagawa +2
Topological superconductors as characterized by Majorana surface states has been actively searched for their significance in fundamental science and technological implication. The…
Density functional theory study of skyrmion pinning by atomic defects in MnSi
Hong Chul Choi, Shi-Zeng Lin, Jian-Xin Zhu
A magnetic skyrmion observed experimentally in chiral magnets is a topologically protected spin texture. For their unique properties, such as high mobility under current drive, sky…
Edge states and local electronic structure around an adsorbed impurity in a topological superconductor
Yuan-Yen Tai, Hongchul Choi, Towfiq Ahmed +2
Recently topological superconducting states has attracted a lot of interest. In this work, we consider a topo- logical superconductor with topological mirror order [1] and s$…
Electron-hole compensation effect between topologically trivial electrons and nontrivial holes in NbAs
Yongkang Luo, N. J. Ghimire, M. Wartenbe +7
Via angular Shubnikov-de Hass (SdH) quantum oscillations measurements, we determine the Fermi surface topology of NbAs, a Weyl semimetal candidate. The SdH oscillations consist of…
Topological properties and the dynamical crossover from mixed-valence to Kondo-lattice behavior in golden phase of SmS
Chang-Jong Kang, Hong Chul Choi, Kyoo Kim +1
We have investigated temperature-dependent behaviors of electronic structure and resistivity in a mixed-valent golden phase of SmS, based on the dynamical mean-field theory band st…
Termination-dependent Surface In-gap States in a Mixed-valent Topological Insulator: SmB
Junwon Kim, Kyoo Kim, Chang-Jong Kang +5
We have investigated the surface states of a potential mixed-valent topological insulator SmB based on the first principles density functional theory slab band structure analys…
Temperature Evolution of Itinerant Ferromagnetism in SrRuO3 Probed by Optical Spectroscopy
D. W. Jeong, Hong Chul Choi, Choong H. Kim +12
The temperature () dependence of the optical conductivity spectra of a single crystal SrRuO thin film is studied over a range from 5 to 450 K. We observed signifi…
Correlated Electronic Structures and the Phase Diagram of Hydrocarbon-based Superconductors
Minjae Kim, B. I. Min, Hong Chul Choi +1
We have investigated correlated electronic structures and the phase diagram of electron-doped hydrocarbon molecular solids, based on the dynamical mean-field theory. We have found…
Kink during the formation of the Kondo resonance band in the heavy fermion system
Hong Chul Choi, K. Haule, G. Kotliar +2
We have investigated the formation of the Kondo resonance (KR) band and the hybridization gap (HG) in the heavy fermion compound CeCoGe2, using a combined approach of the density f…
Temperature-dependent Fermi surface evolution in heavy fermion CeIrIn5
Hong Chul Choi, B. I. Min, J. H. Shim +2
In Cerium-based heavy electron materials, the 4f electron's magnetic moments bind to the itinerant quasiparticles to form composite heavy quasiparticles at low temperature. The vol…
Antiferromagnetic and structural transitions in the superoxide KO2 from first principles: A 2p-electron system with spin-orbital-lattice coupling
Minjae Kim, Beom Hyun Kim, Hong Chul Choi +1
KO2 exhibits concomitant antiferromagnetic (AFM) and structural transitions, both of which originate from the open-shell 2p electrons of O molecules. The structural trans…