Pohang University of Science and Technology · Physics and Astronomy
Professor Hyun-Woo Lee's research lab specializes in advanced materials and nanoscale phenomena, with a strong focus on plasma-based surface engineering for biomedical applications and quantum transport in low-dimensional systems. The lab investigates non-thermal plasma jets for dental and medical treatments, such as tooth bleaching, while also exploring fundamental quantum effects in disordered and quasi-one-dimensional conductors, including transmission zeros and electron counting statistics. Additionally, the lab examines the magnetic and electronic properties of two-dimensional van der Waals materials, particularly Fe₃GeTe₂, for next-generation spintronic devices. These interdisciplinary efforts bridge plasma science, quantum transport, and 2D materials for innovative health and energy technologies.
Figures are computed from collected data and may differ slightly.
Abstract Three‐electrode plasma jet system consisting of a perforated dielectric tube with two outer and one floating inner electrodes was developed and employed for tooth bleaching. Lowered gas breakdown voltage and increased discharge current were achieved by using the floating inner electrode. Optical emission spectra analysis showed that the rotational temperature of the second positive nitrogen bands was ≈290 K and vibrational temperature was ≈2 500 K, which means this plasma is in highly n
We study phase coherent transport in a single channel system using the scattering matrix approach. It is shown that identical vanishing of the transmission amplitude occurs generically in quasi-1D systems if the time reversal is a good symmetry. The transmission zeros naturally lead to abrupt phase changes (without any intrinsic energy scale) and in-phase resonances, providing insights to recent experiments on phase coherent transport through a quantum dot.
We study electron counting statistics of a disordered conductor in the low-temperature limit. We derive an expression for the distribution of charge transmitted over a finite time interval by using a result from the random-matrix theory. In the metallic regime, the peak of the distribution is Gaussian and shows negligible sample-to-sample variations. On the contrary, the tails of the distribution are neither Gaussian nor Poisson-like and exhibit strong sample-to-sample variations.
Recently, the interest in natural products for the treatment of cancer is increasing because they are the pre-screened candidates. In the present study, we demonstrate the therapeutic effect of celastrol, a triterpene extracted from the root bark of Chinese medicine on gastric cancer. The proliferation of AGS and YCC-2 cells were most sensitively decreased in six kinds of gastric cancer cell lines after the treatment with celastrol. Celastrol inhibited the cell migration and increased G1 arrest
Controlling magnetic states by a small current is essential for the next-generation of energy-efficient spintronic devices. However, it invariably requires considerable energy to change a magnetic ground state of intrinsically quantum nature governed by fundamental Hamiltonian, once stabilized below a phase-transition temperature. Here, it is reported that, surprisingly, an in-plane current can tune the magnetic state of the nanometer-thin van der Waals ferromagnet Fe<sub>3</sub> GeTe<sub>2</sub
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