Journal of the Korean Physical Society

pISSN 0374-4884 eISSN 1976-8524

Highlight Articles

  • Random‑singlet‑like state emergent in s = 5/2 frustrated cubic lattice

    Chanhyeon Lee, Sang‑Kwon Lee, Suheon Lee et al.
    J. Korean Phys. Soc. 84(2), 151 - 157 (2024)
    The existence and nature of a random singlet phase in higher dimensions remains elusive, despite certain theories and experiments alluding to its potential stability. In the frustrated cubic antiferromagnet La3Sb3Mn2O14, we identify a scaling relation in ac magnetic susceptibility and magnetization with a scaling exponent of 0.53, giving evidence for emergent random singlets rather than a spin glass. This finding extends the notion of a random-singlet state from low-dimensional quantum to three-dimensional S=5/2 frustrated spin systems.
  • Quantum scales of galaxies from ultralight dark matter

    Jae‑Weon Lee
    J. Korean Phys. Soc. 83(12), 1013 - 1018 (2023)
    We propose that the ultralight dark matter (ULDM) model has characteristic scales for physical quantities of observed galaxies such as mass, size, acceleration, mass flux, and angular momentum from quantum mechanics. The typical angular momentum per dark matter particle is ℏ and the typical physical quantities are functions of specific angular momentum ℏ/m and average background density of the particles. If we use the Compton wavelength instead for the length scale, we can obtain bounds for these physical quantities. We suggest that the physical scales of galaxies depend on the time of their formation and that these characteristic scales are related to some mysteries of observed galaxies.
  • Simulation of classical axion electrodynamics using COMSOL multiphysics

    Junu Jeong, Younggeun Kim, Sungjae Bae et al.
    J. Korean Phys. Soc. 83(3), 161 - 167 (2023)
    While the fundamental equations governing the axion-photon interaction are widely recognized, their comprehensive calculations become imperative when applied to intricate experimental setups. In this work, we utilize COMSOL Multiphysics, a commercially available software that employs the finite element method, to numerically solve the partial differential equations underlying axion electrodynamics. We simulate diverse experimental schemes, including axion haloscope and axion-photon regeneration. We show that the numerical simulations are in excellent agreement with the analytical calculations, confirming that they are reliable for describing axion electrodynamics.
  • Identification of octahedral configuration in strained SrRuO3 thin films

    Tae Hwa Eom, Sang A. Lee, Jae‑Yeol Hwang
    J. Korean Phys. Soc. 83(1), 65 - 71 (2023)
    Strong modulation between crystal symmetry and the corresponding RuO6 octahedral configurations were verified by structural model calculations based on the diffraction data of 20 individual half-order peaks. This proves that the compressively strained SrRuO3 thin film has pseudo-orthorhombic (monoclinic, P21/m, #11) structure with the BO6 configuration of a+ac at 25 °C and tetragonal (I4/mcm, #140) with the octahedral tilt of a0a0c above 285 °C. The structural phase transition from pseudo-orthorhombic to the tetragonal structure was determined at around 285 °C and epitaxial strain was persistent during the structural phase transition in the fully strained SrRuO3/SrTiO3 heterostructured thin film.
  • 40-W 352-nm single-frequency nanosecond pulsed rod-type fiber laser

    Yong‑Ho Cha, Byungjae Chun, Hyunmin Park
    J. Korean Phys. Soc. 82(12), 1157 - 1162 (2023)
    High-power single-frequency ultraviolet laser pulses are generated by third-harmonic generation of 1056-nm laser pulses from a Yb-doped fiber laser system. The fiber laser system utilizes a rod-type fiber in its final amplifier for the generation of 108-W 1056-nm laser pulses, and two LBO crystals are used for the efficient second- and third-harmonic generation, respectively. The average output power of 352-nm laser is more than 40 W at a repetition rate of 900 kHz, and the pulse duration is 12 ns with a measured linewidth of less than 150 MHz, which is ideal for the isotope-selective photo-dissociation of formaldehyde molecules.
  • Explicit dispersion relations for warm fluid waves in a uniform plasma (invited)

    Min Uk Lee, Gunsu S. Yun, Jeong‑Young Ji
    J. Korean Phys. Soc. 82(8), 740 - 747 (2023)
    Computing a dispersion relation for warm plasma waves generally requires numerical methods since the relation is expressed as an implicit function of frequency and wavenumber. In this work, we present an explicit dispersion relation that provides an accurate analytical solution for the dispersion without relying on numerical methods. The derived formula can even describe the dispersion relation near the cyclotron resonance that the implicit relation cannot represent. We verify the validity and accuracy of the formula by comparing its analytical solutions with the numerical results obtained from the implicit dispersion relations and fully kinetic particle-in-cell (PIC) simulations.
  • Room-temperature ferromagnetism observed in graphene oxide

    DaYea Oh, Bae Ho Park, Duk Hyun Lee et al.
    J. Korean Phys. Soc. 82(8), 786 - 792 (2023)
    We investigate magnetic properties of locally oxidized graphene using atomic force microscope lithography, which reduces the possibility of magnetic contamination. Raman spectroscopy analysis reveals that the graphene oxide has a different atomic structure than pristine graphene. Magnetic force microscopy data demonstrate that the graphene oxide has a net magnetization pointing out of the surface plane. Magneto-optical Kerr effect data exhibit small but clear hysteresis loops with non-zero remanent magnetization. X-ray magnetic circular dichroism photoemission electron microscope measurements identifies remarkable asymmetry in carbon K edge spectra, strongly suggesting that the observed ferromagnetic order in the graphene oxide layer is intrinsic.

Most cited research articles published in JKPS since 2012 are listed above.

Most cited research articles published in JKPS since 2012 are listed above.

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Current Issue

February, 2024
Vol.84 No.4

pISSN 0374-4884
eISSN 1976-8524

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Journal Impact factor 0.6

NPSM 새물리 New Physics : Sae Mulli JKPS Journal of Korean Physical Society CAP Current Applied Physics KOFST 한국과학기술단체총연합회 KOREAN COUNCIL OF SCIENCE EDITORS
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Journal of the Korean Physical Society

pISSN 0374-4884 eISSN 1976-8524