News

[Yoonhan Lee and Kee Hoon Kim] High-Temperature concomitant metal-insulator and spin-reorientation t... Jun 24, 2024 l Hit 465

High-Temperature concomitant metal-insulator and spin-reorientation transitions in a compressed nodal-line ferrimagnet Mn3Si2Te6 Symmetry-protected band degeneracy, coupled with a magnetic order, is the key to realizing novel magnetoelectric phenomena in topological magnets. While the spin-polarized nodal states have b...

[ J. Y. Yang and Jonghee Yoo] Search for Periodic Time Variations of the Solar 8 B Neutrino Flux bet... Jun 17, 2024 l Hit 453

We report a search for time variations of the solar 8B neutrino flux using 5804 live days of Super-Kamiokande data collected between May 31, 1996, and May 30, 2018. Super-Kamiokande measured the precise time of each solar neutrino interaction over 22 calendar years to search for solar neutrino flux modulation...

[Hong-Gyu Park's Lab] Spin angular momentum–encoded single-photon emitters in a chiral nanoparticle–... May 27, 2024 l Hit 544

Spin angular momentum–encoded single-photon emitters in a chiral nanoparticle–coupled WSe2 monolayer Spin angular momentum (SAM)–encoded single-photon emitters, also known as circularly polarized single photons, are basic building blocks for the advancement of chiral quantum optics and cryptograp...

[Seung Hun Lee, Yuting Qian, Bohm-Jung Yang] Fermi surface spin texture and topological superconduct... May 13, 2024 l Hit 768

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 976

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 3772

“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 2441

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 3709

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 1018

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 991

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...