Young Jun Chang
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View article: Correlation control of the Mott transition in LaTiO3/SrTiO3 heterostructures
Correlation control of the Mott transition in LaTiO3/SrTiO3 heterostructures Open
The Mott metal-insulator transition arises from electron-electron interactions determined by the ratio of Coulomb to kinetic energy scales ( U / t ). While temperature, pressure, and doping can induce Mott transitions, direct control of U …
View article: Charge Transfer Doping of MoS <sub>2</sub> Field‐Effect Transistors by Aluminum Oxynitride Deposition
Charge Transfer Doping of MoS <sub>2</sub> Field‐Effect Transistors by Aluminum Oxynitride Deposition Open
This study demonstrates the n‐type charge transfer doping of molybdenum disulfide (MoS 2 ) using aluminum oxynitride (AlON) overlayers. By optimizing the composition of AlON, electron doping is enhanced to 3.0 × 10 12 cm −2 , accompanied b…
View article: Surface and mechanical properties of plasma-enhanced chitosan/polyvinyl alcohol films
Surface and mechanical properties of plasma-enhanced chitosan/polyvinyl alcohol films Open
This study aims to investigates the surface and mechanical properties of chitosan (CS)/polyvinyl alcohol (PVA) composite films modified by O2 and N2 plasmas. The CS/PVA = 1/3 (g/g) film exhibited the highest fracture toughness and lowest b…
View article: In‐Plane Anisotropy in van der Waals NiTeSe Ternary Alloy
In‐Plane Anisotropy in van der Waals NiTeSe Ternary Alloy Open
The anisotropic properties of materials profoundly influence their electronic, magnetic, optical, and mechanical behaviors and are critical for a wide range of applications. In this study, the anisotropic characteristics of Ni‐based van de…
View article: Optical nonlinear refractive index measurements of Cr <sub>2</sub> Te <sub>3</sub> with an immense photothermal effect
Optical nonlinear refractive index measurements of Cr <sub>2</sub> Te <sub>3</sub> with an immense photothermal effect Open
In this work, the optical nonlinearity of PVD-grown Cr 2 Te 3 thin films of 33- and 100-nm thickness with an immense thermal optical effect was investigated.
View article: Epitaxial Sr-doped nickelate perovskite thin films and Ruddlesden-Popper phases grown by magnetron sputtering
Epitaxial Sr-doped nickelate perovskite thin films and Ruddlesden-Popper phases grown by magnetron sputtering Open
Sr-doped nickelate, Nd1-xSrxNiO3 (NSNO), perovskite thin films and Ruddlesden-Popper (RP) phases are actively investigated because of their physical properties, such as the metal-insulator transition and superconductivity. However, achievi…
View article: Electronic structure and charge-density wave transition in monolayer $\\mathrm{VS}_2$
Electronic structure and charge-density wave transition in monolayer $\\mathrm{VS}_2$ Open
Vanadium disulfide (VS2) attracts elevated interests for its charge-density wave (CDW) phase transition, ferromagnetism, and catalytic reactivity, but the electronic structure of monolayer has not been well understood yet. Here we report s…
View article: Emergence of two distinct phase transitions in monolayer CoSe2 on graphene
Emergence of two distinct phase transitions in monolayer CoSe2 on graphene Open
Dimensional modifications play a crucial role in various applications, especially in the context of device miniaturization, giving rise to novel quantum phenomena. The many-body dynamics induced by dimensional modifications, including elec…
View article: https://2DMat.ChemDX.org: Experimental data platform for 2D materials from synthesis to physical properties
https://2DMat.ChemDX.org: Experimental data platform for 2D materials from synthesis to physical properties Open
https://2DMat.ChemDX.org is a comprehensive data platform tailored for 2D materials research, emphasizing the handling and analysis of experimental data through specialized data management, visualization, and machine learning tools.
View article: Controlling the magnetic properties of layered Cr2Te3 thin films via ex-situ annealing
Controlling the magnetic properties of layered Cr2Te3 thin films via ex-situ annealing Open
We present a post-growth ex-situ annealing method to control the Curie temperature and magnetic anisotropy of Cr2Te3 van der Waals ferromagnetic thin films. The as-grown Cr2Te3 films exhibit a Curie temperature ∼ 170 K with an out-of-plane…
View article: External screening and lifetime of exciton population in single-layer ReSe$_2$ probed by time- and angle-resolved photoemission spectroscopy
External screening and lifetime of exciton population in single-layer ReSe$_2$ probed by time- and angle-resolved photoemission spectroscopy Open
The semiconductor ReSe$_2$ is characterized by a strongly anisotropic optical absorption and is therefore promising as an optically active component in two-dimensional heterostructures. However, the underlying femtosecond dynamics of photo…
View article: Direct characterization of intrinsic defects in monolayer ReSe<sub>2</sub> on graphene
Direct characterization of intrinsic defects in monolayer ReSe<sub>2</sub> on graphene Open
By establishing a close collaboration between high-resolution STM/STS experiments and advanced STM models, we elucidate how intrinsic defects influence the electronic properties of monolayer ReSe 2 on graphene.
View article: Fine structure of the charge density wave in bulk VTe2
Fine structure of the charge density wave in bulk VTe2 Open
Vanadium ditelluride (VTe2) has been intensively explored to understand the charge density wave (CDW) phase and its connection to magnetic properties. Here, we conduct a systematic study to understand the fine structure of CDW via scanning…
View article: Controlling Spin–Orbit Coupling to Tailor Type-II Dirac Bands
Controlling Spin–Orbit Coupling to Tailor Type-II Dirac Bands Open
NiTe2, a type-II Dirac semimetal with a strongly tilted Dirac band, has been explored extensively to understand its intriguing topological properties. Here, using density functional theory calculations, we report that the strength of the s…
View article: Strong electron–phonon coupling driven charge density wave states in stoichiometric 1T-VS<sub>2</sub> crystals
Strong electron–phonon coupling driven charge density wave states in stoichiometric 1T-VS<sub>2</sub> crystals Open
Combining chemical reaction and low-temperature annealing allows to form perfectly stoichiometric 1T-VS 2 , where multiple charge density wave orders are observed due to strong electron–phonon coupling.