News

[Seung Hun Lee, Yuting Qian, Bohm-Jung Yang] Fermi surface spin texture and topological superconduct... May 13, 2024 l Hit 952

Fermi surface spin texture and topological superconductivity in spin-orbit free noncollinear antiferromagnets We explore the relationship among the magnetic ordering in real space, the resulting spin texture on the Fermi surface, and the related superconducting gap structure in non-collinear antiferromagnetic metals wi...

[Youjin Lee and Je-Geun Park] Imaging thermally fluctuating Néel vectors in van der Waals antiferrom... May 9, 2024 l Hit 1104

Imaging thermally fluctuating Néel vectors in van der Waals antiferromagnet NiPS3 Studying antiferromagnetic domains is essential for fundamental physics and potential spintronics applications. Despite its importance, few systematic studies have been performed on van der Waals (vdW) antiferromagnets (AFMs) domai...

[Suyoung Lee and Prof. Changyoung Kim] Broken Kramers Degeneracy in Altermagnetic MnTe (published in... Jan 22, 2024 l Hit 4709

“Broken Kramers Degeneracy in Altermagnetic MnTe” Altermagnetism is a newly identified fundamental class of magnetism with vanishing net magnetization and time-reversal symmetry broken electronic structure. Probing the unusual electronic structure with nonrelativistic spin splitting would be a...

[Ha-Leem Kim,  Heejun Yang, and Prof.  Je-Geun Park] Thermal Hall effects due to topological spin flu... Jan 4, 2024 l Hit 2779

The thermal Hall effect in magnetic insulators has been considered a powerful method for examining the topological nature of charge-neutral quasiparticles such as magnons. Yet, unlike the kagome system, the triangular lattice has received less attention for studying the thermal Hall effect because the scalar spin chira...

[Dr. Kai-Xuan Zhang / Prof. Je-Geun Park]  Broken Inversion Symmetry in Van Der Waals Topological Fe... Jan 2, 2024 l Hit 4108

Inversion symmetry breaking is critical for many quantum effects and fundamental for spin-orbit torque, which is crucial for next-generation spintronics. Recently, a novel type of gigantic intrinsic spin-orbit torque has been established in the topological van-der-Waals (vdW) magnet iron germanium telluride. However, i...

[Pyeongjae Park and Je-Geun Park] Tetrahedral triple-Q magnetic ordering and large spontaneous Hall ... Dec 15, 2023 l Hit 1238

Tetrahedral triple-Q magnetic ordering and large spontaneous Hall conductivity in the metallic triangular antiferromagnet Co1/3TaS2 The triangular lattice antiferromagnet (TLAF) has been the standard paradigm of frustrated magnetism for several decades. The most common magnetic ordering in insulating TLAFs is the 120&d...

[Jiho Jang and Prof. Hongki Min] Optical Transitions of a Single Nodal Ring in SrAs3: Radially and A... Dec 7, 2023 l Hit 1149

SrAs3 is a unique nodal-line semimetal that contains only a single nodal ring in the Brillouin zone, uninterrupted by any trivial bands near the Fermi energy. We performed axis-resolved optical reflection measurements on SrAs3 and observed that the optical conductivity exhibits flat absorption up to 129 meV in both the...

[Seong-Hyub Lee, Myeonghoe Kim, Hyun-Seok Whang, & Prof. Sug-Bong Choe] Position error-free control ... Dec 1, 2023 l Hit 887

Magnetic domain-wall devices such as racetrack memory and domain-wall shift registers facilitate massive data storage as hard disk drives with low power portability as flash memory devices. The key issue to be addressed is how perfectly the domain-wall motion can be controlled without deformation, as it can replace the...

[Prof. Hong-Gyu Park's Group] Vortex nanolaser based on a photonic disclination cavity Nov 29, 2023 l Hit 890

Optical vector vortex beams provide additional degrees of freedom for spatially distinguishable channels in data transmission. Although several coherent light sources carrying a topological singularity have been reported, it remains challenging to develop a general strategy for designing ultra-small, high-quality photo...

[Prof. Hong-Gyu Park's Group] The ultra-thin, minimally invasive surface electrode array NeuroWeb fo... Nov 14, 2023 l Hit 793

Electrophysiological recording technologies can provide valuable insights into the functioning of the central and peripheral nervous systems. Surface electrode arrays made of soft materials or implantable multi-electrode arrays with high electrode density have been widely utilized as neural probes. However, neither of ...