News

[Keehoon Kang, Prof. Takhee Lee] Layer-by-Layer Structural Identification of 2D Ruddlesden–Popper Hy... Jan 28, 2021 l Hit 2978

Application of two-dimensional (2D) organic–inorganic hybrid halide perovskites in optoelectronic devices requires a detailed understanding of the local structural features including the Pb–I bonding in the 2D layers and the organic–inorganic interaction between the organic spacer molecules and the pe...

[Sangwoo Sim, Heejun Yang and Prof. Je-Geun Park] Sizable Suppression of Thermal Hall Effect upon Is... Jan 14, 2021 l Hit 742

We report measurements of the thermal Hall effect in single crystals of both pristine and isotopically substituted strontium titanate. We discovered a two orders of magnitude difference in the thermal Hall conductivity between SrTi16O3 and 18O-enriched SrTi18O3 samples. In most temperature ranges, the magnitude of ther...

[Minsu Kang and Prof. Heonsu Jeon] Submicron-scale pattern generation via maskless digital photolith... Dec 17, 2020 l Hit 794

Maskless photolithography based on the digital micromirror device (DMD), a two-dimensional micromirror array, is considered the next-generation low-cost lithographic technology. However, the DMD-based digital photolithography has been implemented only for micrometre-scale pattern generation, whereas sophisticated photo...

[S. Omkar, Y.S. Teo and H. Jeong] Resource-Efficient Topological Fault-Tolerant Quantum Computation ... Aug 10, 2020 l Hit 1041

We propose an all-linear-optical scheme to ballistically generate a cluster state for measurement-based topological fault-tolerant quantum computation using hybrid photonic qubits entangled in a continuous-discrete domain. Availability of near-deterministic Bell-state measurements on hybrid qubits is exploited for this...

Strain engineering of the magnetic multipole moments and anomalous Hall effect in pyrochlore iridate... Jul 22, 2020 l Hit 1549

The recent observation of the anomalous Hall effect (AHE) without notable magnetization in antiferromagnets has suggested that ferromagnetic ordering is not a necessary condition. Thus, recent theoretical studies have proposed that higher-rank magnetic multipoles formed by clusters of spins (cluster multipoles) can gen...

Coherent many-body exciton in van der Waals antiferromagnet NiPS3 Jul 22, 2020 l Hit 1011

Excitons are the composite particles of an electron-hole pair and rarely observed for many-body states with strong correlation. Here we show that a rare spin-orbital entangled exciton state appears below TN=150 K in NiPS3, an antiferromagnetic (AFM) van der Waals (vdW) material. It arises intrinsically from the archety...

Momentum-dependent magnon lifetime in the metallic non-collinear triangular antiferromagnet CrB2 Jul 9, 2020 l Hit 2398

Noncollinear magnetic order arises for various reasons in several magnetic systems and exhibits interesting spin dynamics. Despite its ubiquitous presence, little is known of how magnons, otherwise stable quasiparticles, decay in these systems, particularly in metallic magnets. Using inelastic neutron scattering, we ex...

[Kok Chuan Tan, Seongjeon Choi, and Hyunseok Jeong] Negativity of Quasiprobability Distributions as ... Mar 26, 2020 l Hit 1539

We demonstrate that the negative volume of any s-parametrized quasiprobability, including the Glauber-Sudashan P-function, can be consistently defined and forms a continuous hierarchy of nonclassicality measures that are linear optical monotones. These measures belong to an operational resource theory of nonclassicalit...

[Sungjoon Park,Prof. Bohm-Jung Yang] Thermal Hall Effect, Spin Nernst Effect, and Spin Density Induc... Mar 13, 2020 l Hit 1744

We theoretically study the intrinsic thermal Hall and spin Nernst effect in collinear ferrimagnets on a honeycomb lattice with broken inversion symmetry. The broken inversion symmetry allows in-plane Dzyaloshinskii−Moriya interaction between the nearest neighbors, which does not affect the linear spin wave theory...

[KPS Award Winner] Junyeong Ahn (Ph.D. Candidate) received the Young Physicist Prize! Oct 29, 2019 l Hit 2249

Junyeong Ahn, a Ph.D Candidate at Prof. Bohm-Jung Yang's group, won the Young Physicist Prize at the KPS autumm meeting held at Gwangju, Kim Dae Joong convention center for Oct.23-25, 2019. The Prize is awarded for Junyeong's outstanding achievement about the band topology of wave functions in space-time inversi...