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14 papers
Photoluminescence Path Bifurcations by Spin Flip in Two-Dimensional CrPS4
Suhyeon Kim, Sangho Yoon, Hyo-Bin Ahn +6
Ultrathin layered crystals of coordinated chromium(III) are promising not only as two-dimensional (2D) magnets but also as 2D near-infrared (NIR) emitters owing to long-range spin…
Spin dynamics slowdown near the antiferromagnetic critical point in atomically thin FePS3
Xiao-Xiao Zhang, Shengwei Jiang, Jinhwan Lee +3
Two-dimensional (2D) magnetic materials have attracted much recent interest with unique properties emerging at the few-layer limit. Beyond the reported impacts on the static magnet…
Polarized Raman Spectra and Complex Raman Tensors of Antiferromagnetic Semiconductor CrPS4
Sujin Kim, Jinhwan Lee, Changgu Lee +1
Chromium thiophosphate (CrPS4), a monoclinic crystal of C_2^3 space group, is a ternary layered semiconductor with an optical bandgap of 1.4 eV and exhibits antiferromagnetism belo…
On-Stack Two-Dimensional Conversion of MoS2 into MoO3
Taeg Yeoung Ko, Areum Jeong, Wontaek Kim +10
Chemical transformation of existing two-dimensional (2D) materials can be crucial in further expanding the 2D crystal palette required to realize various functional heterostructure…
Crossover between Photochemical and Photothermal Oxidations of Atomically Thin Magnetic Semiconductor CrPS4
Suhyeon Kim, Jinhwan Lee, Gangtae Jin +3
Many two-dimensional (2D) semiconductors represented by transition metal dichalcogenides have tunable optical bandgaps in the visible or near IR-range standing as a promising candi…
Structural and optical properties of single- and few-layer magnetic semiconductor CrPS4
Jinhwan Lee, Taeg Yeoung Ko, Jung Hwa Kim +7
Atomically thin binary 2-dimensional (2D) semiconductors exhibit diverse physical properties depending on their composition, structure and thickness. By adding another element in t…
Interlayer magnetism in Fe3-xGeTe2
Xiangru Kong, Giang D. Nguyen, Jinhwan Lee +7
FeGeTe is a layered van der Waals magnetic material with a relatively high ordering temperature and large anisotropy. While most studies have concluded the interlayer o…
Antisymmetric magnetoresistance in van der Waals Fe3GeTe2/graphite/Fe3GeTe2 tri-layer heterostructures
Sultan Albarakati, Cheng Tan, Zhong-Jia Chen +15
Van der Waals (vdW) ferromagnetic materials are rapidly establishing themselves as effective building blocks for next generation spintronic devices. When layered with non-magnetic…
Topological Insulator-Based van der Waals Heterostructures for Effective Control of Massless and Massive Dirac Fermions
Su Kong Chong, Kyu Bum Han, Akira Nagaoka +8
Three dimensional (3D) topological insulators (TIs) are an important class of materials with applications in electronics, spintronics and quantum computing. With the recent develop…
Hard magnetic properties in nanoflake van der Waals Fe3GeTe2
Cheng Tan, Jinhwan Lee, Soon-Gil Jung +7
Two dimensional (2D) van der Waals (vdW) materials have demonstrated fascinating optical, electrical and thickness-dependent characteristics. These have been explored by numerous a…
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…
Observation of tightly bound trions in monolayer MoS2
Kin Fai Mak, Keliang He, Changgu Lee +4
Two-dimensional (2D) atomic crystals, such as graphene and transition-metal dichalcogenides, have emerged as a new class of materials with remarkable physical properties. In contra…
Anomalous Lattice Vibrations of Single and Few-Layer MoS2
Changgu Lee, Hugen Yan, Louis E. Brus +3
Molybdenum disulfide (MoS2) of single and few-layer thickness was exfoliated on SiO2/Si substrate and characterized by Raman spectroscopy. The number of S-Mo-S layers of the sample…
Atomically thin MoS2: A new direct-gap semiconductor
Kin Fai Mak, Changgu Lee, James Hone +2
The electronic properties of ultrathin crystals of molybdenum disulfide consisting of N = 1, 2, ... 6 S-Mo-S monolayers have been investigated by optical spectroscopy. Through char…