832 citations · 2.3k across the 20 of their papers we have counts for
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Stable topological phase transitions without symmetry indications in NaZnSbBi
Jaemo Jung, Dongwook Kim, Youngkuk Kim
We study topological phase transitions in tetragonal NaZnSbBi, driven by the chemical composition . Notably, we examine mirror Chern numbers that change without symm…
Tunable bulk photovoltaic effect in strained -GeSe
Hong-Guk Min, Churlhi Lyi, Youngkuk Kim
Recently, Lee \textit{et. al.} [Nano Lett. \textbf{21}, 4305 (2021)] newly synthesized monochalcogenide GeSe in a polar phase, referred to as -phase. Motivated by this work, we…
Two-dimensional weak-type topological insulators in inversion symmetric crystals
Sunam Jeon, Youngkuk Kim
The Su-Schrieffer-Heeger (SSH) chain is an one-dimensional lattice that comprises two dimerized sublattices. Recently, Zhu, Prodan, and Ahn (ZPA) proposed in [L. Zhu, E. Prodan, an…
On-demand quantum spin Hall insulators controlled by two-dimensional ferroelectricity
Jiawei Huang, Xu Duan, Sunam Jeon +4
The coexistence of ferroelectric and topological orders in two-dimensional (2D) atomic crystals allows non-volatile and switchable quantum spin Hall states. Here we offer a general…
Ferromagnetic nodal-line metal in monolayer {\em h}-InC
Sunam Jeon, Yun-Tak Oh, Youngkuk Kim
Based on first-principles calculations, we predict a new two-dimensional ferromagnetic material that exhibits exotic Fermi surface topology. We show that monolayer hexagonal indium…
Type-II Dirac line node in strained Na3N
Dongwook Kim, Seongjin Ahn, Jong Hyun Jung +4
Dirac line node (DLN) semimetals are a class of topological semimetals that feature band-crossing lines in momentum space. We study the type-I and type-II classification of DLN sem…
Double Dirac Semimetals in Three Dimensions
Benjamin J. Wieder, Youngkuk Kim, A. M. Rappe +1
We study a class of Dirac semimetals that feature an eightfold-degenerate double Dirac point. We show that 7 of the 230 space groups can host such Dirac points and argue that they…
Substantial optical dielectric enhancement by volume compression in LiAsSe
Fan Zheng, John A. Brehm, Steve M. Young +2
Based on first-principles calculations, we predict a substantial increase in the optical dielectric function of LiAsSe under pressure. We find that the optical dielectric const…
Strain Induced Ferroelectric Topological Insulator
Shi Liu, Youngkuk Kim, Liang Z. Tan +1
The simultaneous presence of seemingly incompatible properties of solids often provides a unique opportunity to address questions of fundamental and practical importance. The coexi…
Dirac Line Nodes in Inversion Symmetric Crystals
Youngkuk Kim, Benjamin J. Wieder, C. L. Kane +1
We propose and characterize a new class of topological semimetals with a vanishing spin--orbit interaction. The proposed topological semimetals are characterized by…
Layered Topological Crystalline Insulators
Youngkuk Kim, C. L. Kane, E. J. Mele +1
Topological crystalline insulators (TCIs) are insulating materials whose topological property relies on generic crystalline symmetries. Based on first-principles calculations, we s…