Junyeong Ahn
Seoul National University
41 Papers
334 Citations
Junyeong Ahn is an academic researcher from Seoul National University. The author has contributed to research in topics: Topological insulator & Antiferromagnetism. The author has an hindex of 11, co-authored 24 publications. Previous affiliations of Junyeong Ahn include Harvard University & Global Alliance in Management Education.
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Papers
Band Topology and Linking Structure of Nodal Line Semimetals with Z_{2} Monopole Charges.
TL;DR: It is proposed that pair creation and annihilation of nodal lines with Z_{2} monopole charges can mediate a topological phase transition between a normal insulator and a three-dimensional weak Stiefel-Whitney insulator.
277
Failure of Nielsen-Ninomiya theorem and fragile topology in two-dimensional systems with space-time inversion symmetry: application to twisted bilayer graphene at magic angle
TL;DR: In this article, it was shown that the Wannier obstruction and the fragile topology of the nearly flat bands in twisted bilayer graphene at magic angle are manifestations of the nontrivial topology characterized by the Euler class.
247
Failure of Nielsen-Ninomiya Theorem and Fragile Topology in Two-Dimensional Systems with Space-Time Inversion Symmetry: Application to Twisted Bilayer Graphene at Magic Angle
TL;DR: In this paper, a new theory reveals the topological origin of the mismatch between the number of left and right-handed Dirac quasiparticles in twisted bilayer graphene, which is a step toward identifying new topological phases of matter.
201
Topological Correspondence between Hermitian and Non-Hermitian Systems: Anomalous Dynamics.
TL;DR: This work proves that for every Hermitian anomalous boundary mode of the ten Altland-Zirnbauer classes, a non-Hermitian counterpart can be constructed, whose long-time dynamics provides a realization of the anomalous border state.
193
Two-dimensional higher-order topology in monolayer graphdiyne
Eunwoo Lee,Rokyeon Kim,Rokyeon Kim,Junyeong Ahn,Bohm-Jung Yang +4 more
- 09 Jan 2020
TL;DR: Based on first-principles calculations and tight-binding model analysis, this paper proposed monolayer graphdiyne as a candidate material for a two-dimensional higher-order topological insulator protected by inversion symmetry.