1.1k citations · 3.9k across the 19 of their papers we have counts for
19 papers
Polytypism in Few-Layer Gallium Selenide
Soo Yeon Lim, Jae-Ung Lee, Jung Hwa Kim +6
Gallium selenide (GaSe) is one of layered group-III metal monochalcogenides, which has an indirect bandgap in monolayer and direct bandgap in bulk unlike other conventional transit…
Antiferromagnetic ordering in van der Waals two-dimensional magnetic material MnPS3 probed by Raman spectroscopy
Kangwon Kim, Soo Yeon Lim, Jungcheol Kim +8
Magnetic ordering in the two-dimensional limit has been one of the most important issues in condensed matter physics for the past several decades. The recent discovery of new magne…
Suppression of magnetic ordering in XXZ-type antiferromagnetic monolayer NiPS3
Kangwon Kim, Soo Yeon Lim, Jae-Ung Lee +7
How a certain ground state of complex physical systems emerges, especially in two-dimensional materials, is a fundamental question in condensed-matter physics. A particularly inter…
Strain-shear coupling in bilayer MoS2
Jae-Ung Lee, Sungjong Woo, Jaesung Park +3
Layered materials such as graphite and transition metal dichalcogenides have extremely anisotropic mechanical properties owing to orders of magnitude difference between in-plane an…
Excitonic Resonance Effects and Davydov Splitting in Circularly Polarized Raman Spectra of Few-Layer WSe2
Sanghun Kim, Kangwon Kim, Jae-Ung Lee +1
Few-layer tungsten diselenide (WSe2) is investigated using circularly polarized Raman spectroscopy with up to eight excitation energies. The main E2g1 and A1g modes near 250 cm-1 a…
Excitation energy dependence of Raman spectra of few-layer WS2
Jinho Yang, Jae-Ung Lee, Hyeonsik Cheong
Raman spectra of few-layer WS2 have been measured with up to seven excitation energies, and peculiar resonance effects are observed. The two-phonon acoustic phonon scattering signa…
Davydov splitting and excitonic resonance effects in Raman spectra of few-Layer MoSe2
Kangwon Kim, Jae-Ung Lee, Dahyun Nam +1
Raman spectra of few-layer MoSe2 were measured with 8 excitation energies. New peaks that appear only near resonance with various exciton states are analyzed, and the modes are ass…
Determination of the thickness and orientation of few-layer tungsten ditelluride using polarized Raman spectroscopy
Minjung Kim, Songhee Han, Jung Hwa Kim +3
Orthorhombic tungsten ditelluride (WTe2), with a distorted 1T structure, exhibits a large magnetoresistance that depends on the orientation, and its electrical characteristics chan…
Ising-Type Magnetic Ordering in Atomically Thin FePS3
Jae-Ung Lee, Sungmin Lee, Ji Hoon Ryoo +6
Magnetism in two-dimensional materials is not only of fundamental scientific interest but also a promising candidate for numerous applications. However, studies so far, especially…
Raman Signatures of Polytypism in Molybdenum Disulfide
Jae-Ung Lee, Kangwon Kim, Songhee Han +3
Since the stacking order sensitively affects various physical properties of layered materials, accurate determination of the stacking order is important for studying the basic prop…
Excitation energy dependent Raman spectrum of MoSe2
Dahyun Nam, Jae-Ung Lee, Hyeonsik Cheong
Raman investigation of MoSe2 was carried out with eight different excitation energies. Seven peaks, including E1g, A1g, E2g1, and A2u2 peaks are observed in the range of 100-400 cm…
Anomalous polarization dependence of Raman scattering and crystallographic orientation of black phosphorus
Jungcheol Kim, Jae-Ung Lee, Jinhwan Lee +4
We investigated polarization dependence of the Raman modes in black phosphorus (BP) using five different excitation wavelengths. The crystallographic orientation was determined by…
Resonant Raman and photoluminescence spectra of suspended molybdenum disulfide
Jae-Ung Lee, Kangwon Kim, Hyeonsik Cheong
Raman and photoluminescence (PL) measurements were performed on suspended and supported MoS2 up to 6 trilayers (TLs). The difference in the dielectric environment of suspended and…
Photocurrent generation at ABA/ABC lateral junction in tri-layer graphene photodetector
Minjung Kim, Seon-Myeong Choi, Ho Ang Yoon +6
Metal-graphene-metal photodetectors utilize photocurrent generated near the graphene/metal junctions and have many advantages including high speed and broad-band operation. Here, w…
Anomalous excitonic resonance Raman effects in few-layer MoS2
Jae-Ung Lee, Jaesung Park, Young-Woo Son +1
The resonance effects on the Raman spectra from 5 to 900 cm-1 of few-layer MoS2 thin films up to 14-layers were investigated by using six excitation energies. For the main first-or…
Excitation Energy Dependent Raman Signatures of ABA- and ABC-stacked Few-layer Graphene
The An Nguyen, Jae-Ung Lee, Duhee Yoon +1
The dependence of the Raman spectrum on the excitation energy has been investigated for ABA-and ABC- stacked few-layer graphene in order to establish the fingerprint of the stackin…
Polarization dependence of double resonant Raman scattering band in bilayer graphene
Jae-Ung Lee, Ngor Mbaye Seck, Duhee Yoon +3
The polarization dependence of the double resonant Raman scattering (2D) band in bilayer graphene (BLG) is studied as a function of the excitation laser energy. It has been known t…
Estimation of Young's Modulus of Graphene by Raman Spectroscopy
Jae-Ung Lee, Duhee Yoon, Hyeonsik Cheong
The Young's modulus of graphene is estimated by measuring the strain applied by a pressure difference across graphene membranes using Raman spectroscopy. The strain induced on pres…
Thermal conductivity of suspended pristine graphene measured by Raman spectroscopy
Jae-Ung Lee, Duhee Yoon, Hakseong Kim +2
The thermal conductivity of suspended single-layer graphene was measured as a function of temperature using Raman scattering spectroscopy on clean samples prepared directly on a pr…