89 citations · 507 across the 13 of their papers we have counts for
13 papers
Fresnel-type Solid Immersion Lens for efficient light collection from quantum defects in diamond
SungJoon Park, Gyeonghun Kim, Kiho Kim +1
Quantum defects in diamonds have been studied as a promising resource for quantum science. The subtractive fabrication process for improving photon collection efficiency often requ…
Theory of transverse magnetization in spin-orbit coupled antiferromagnets
Taekoo Oh, Sungjoon Park, Bohm-Jung Yang
Some antiferromagnets under a magnetic field develop magnetization perpendicular to the field as well as more conventional ones parallel to the field. So far, the transverse magnet…
Magnetoelastic coupling enabled tunability of magnon spin current generation in 2D antiferromagnets
Nasim Bazazzadeh, Mohammad Hamdi, Sungjoon Park +3
We theoretically investigate the magnetoelastic coupling (MEC) and its effect on magnon transport in two-dimensional antiferromagnets with a honeycomb lattice. MEC coeffcient along…
Unsupervised learning of topological phase diagram using topological data analysis
Sungjoon Park, Yoonseok Hwang, Bohm-Jung Yang
Topology and machine learning are two actively researched topics not only in condensed matter physics, but also in data science. Here, we propose the use of topological data analys…
Temperature selective thermometry with sub-microsecond time resolution using dressed-spin states in diamond
Jiwon Yun, Kiho Kim, Sungjoon Park +1
Versatile nanoscale sensors that are susceptible to changes in a variety of physical quantities often exhibit limited selectivity. This paper reports a novel scheme based on microw…
Topological acoustic triple point
Sungjoon Park, Yoonseok Hwang, Hong Chul Choi +1
Acoustic phonon in a crystalline solid is a well-known and ubiquitous example of elementary excitation with a triple degeneracy in the band structure. Because of the Nambu-Goldston…
Thermal Hall effect from two-dimensional Schwinger-boson gas with Rashba spin-orbit interaction: application to ferromagnets with in-plane Dzyaloshinskii-Moriya interaction
Sungjoon Park, Bohm-Jung Yang
Recently, uncovering the sources of thermal Hall effect in insulators has become an important issue. In the case of ferromagnetic insulators, it is well known that Dzyaloshinskii-M…
Phonon angular momentum Hall effect
Sungjoon Park, Bohm-Jung Yang
Spin Hall effect is the transverse flow of the electron spin in conductors under external electric field. Similarly, thermal gradient in magnetic insulators can drive a transverse…
Thermal Hall effect, spin Nernst effect, and spin density induced by thermal gradient in collinear ferrimagnets from magnon-phonon interaction
Sungjoon Park, Naoto Nagaosa, Bohm-Jung Yang
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 symme…
Stiefel-Whitney classes and topological phases in band theory
Junyeong Ahn, Sungjoon Park, Dongwook Kim +2
In this article, we review the recent progress in the study of topological phases in systems with space-time inversion symmetry . is an anti-unitary…
Topological Magnetoelastic Excitations in Non-Collinear Antiferromagnets
Sungjoon Park, Bohm-Jung Yang
We study the topological property of the magnetoelastic excitation in non-collinear antiferromagnets. As a toy model, we consider the magnon-phonon coupling in a triangular antifer…
The Evolution of the HeII-Ionizing Background at Redshifts 2.3<z<3.8 Inferred from a Statistical Sample of 24 HST/COS HeII Ly Absorption Spectra
Gábor Worseck, Frederick B. Davies, Joseph F. Hennawi +1
We present measurements of the large-scale (~40 comoving Mpc) effective optical depth of HeII Ly absorption, , at 2.54<z<3.86 toward 16 HeII-transparent quasars obs…
Classification of accidental band crossings and emergent semimetals in two-dimensional noncentrosymmetric systems
Sungjoon Park, Bohm-Jung Yang
We classify all possible gap-closing procedures which can be achieved in two-dimensional time-reversal invariant noncentrosymmetric systems. For exhaustive classification, we exami…