News

[Dr. Kai-Xuan Zhang / Prof. Je-Geun Park]  Broken Inversion Symmetry in Van Der Waals Topological Fe... Jan 2, 2024 l Hit 3960

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 1165

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 1093

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 847

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 843

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 746

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 ...

[Junghyun Kim and Prof. Je-Geun Park] Rapid suppression of quantum many-body magnetic exciton in dop... Nov 7, 2023 l Hit 799

The unique discovery of magnetic exciton in van der Waals antiferromagnet NiPS3 arises between two quantum many-body states of a Zhang-Rice singlet excited state and a Zhang-Rice triplet ground state. Simultaneously, the spectral width of photoluminescence originating from this exciton is exceedingly narrow as 0.4...

[Dr. Tae-Yun Lee & Prof. Heonsu Jeon] Resonant cavity phosphor (Published in Nature Communications) Oct 25, 2023 l Hit 1820

While phosphors play an immensely important role in solid-state lighting and full-colour displays, it has been noted lately that their performance can be largely improved via structural engineering. Here, phosphor material is synergistically merged with yet another structurally engineered platform, reson...

[Prof. Byeongsu Yang , Dr. Moohyun Ahn and Prof. Jonghee Yoo] Extended Axion Dark Matter Search Usin... Aug 28, 2023 l Hit 547

We report an extended search for the axion dark matter using the CAPP18T haloscope. The CAPP18T experiment adopts innovative technologies of a high-temperature superconducting magnet and a Josephson parametric converter. The total system noise temperature is ∼0.6 K. The scan frequency range is from 4.8077 to 4...

[Chaebin Kim, & Prof. Je-Geun Park] Bond-dependent anisotropy and magnon-decay in cobalt-based Kitae... Aug 28, 2023 l Hit 685

The Kitaev model, a honeycomb network of spins with bond-dependent anisotropic interactions, is a rare example of a system with a quantum spin liquid ground state. Although most Kitaev model candidate materials eventually order magnetically due to additional non-Kitaev interactions, their bond-dependent anisotropy mani...