Jeonghwan Ahn
YOU?
Author Swipe
View article: Enhancing management of flood forecasting in Southern New Jersey: a HEC-HMS model development for Maurice River and Raccoon Creek Watersheds
Enhancing management of flood forecasting in Southern New Jersey: a HEC-HMS model development for Maurice River and Raccoon Creek Watersheds Open
Southern New Jersey, the USA, particularly its coastal regions, faces rising flood risks due to frequent and extreme weather events associated with climate change. Interactions between rainfall and runoff remain challenging due to data lim…
View article: Quantum Monte Carlo Benchmarking of Molecular Adsorption on Graphene-Supported Single Pt Atom
Quantum Monte Carlo Benchmarking of Molecular Adsorption on Graphene-Supported Single Pt Atom Open
The precise understanding of adsorption energetics and molecular geometry at catalytic sites is fundamental for advancing catalysis, particularly under the constraints of resource efficiency and environmental sustainability. This study ben…
View article: Toward improved property prediction of 2D materials using many-body quantum Monte Carlo methods
Toward improved property prediction of 2D materials using many-body quantum Monte Carlo methods Open
The field of 2D materials has grown dramatically in the past two decades. 2D materials can be utilized for a variety of next-generation optoelectronic, spintronic, clean energy, and quantum computing applications. These 2D structures, whic…
View article: Stacking polymorphism of PtSe2: its implication to layer-dependent metal-insulator transitions
Stacking polymorphism of PtSe2: its implication to layer-dependent metal-insulator transitions Open
Using diffusion Monte Carlo (DMC) and density functional theory (DFT) calculations, we examine the structural stability and interlayer binding properties of PtSe 2 . Our DMC study reveals that AA and AB-r bilayer stacking modes are nearly …
View article: Identifying Band Inversions in Topological Materials Using Diffusion Monte Carlo
Identifying Band Inversions in Topological Materials Using Diffusion Monte Carlo Open
Topological insulators are characterized by insulating bulk states and robust metallic surface states. Band inversion is a hallmark of topological insulators: at time-reversal invariant points in the Brillouin zone, spin-orbit coupling (SO…
View article: Optimizing Density Functional Theory for Strain-Dependent Magnetic Properties of MnBi(_2)Te(_4) with Diffusion Monte Carlo
Optimizing Density Functional Theory for Strain-Dependent Magnetic Properties of MnBi(_2)Te(_4) with Diffusion Monte Carlo Open
In this study, we evaluate the predictive power of density functional theory (DFT) for the magnetic properties of MnBi2Te4 (MBT), an intrinsically magnetic topological insulator with potential applications in spintronics and quantum comput…
View article: Stacking Polymorphism of PtSe$_{2}$: Its Implication to Layer-dependent Metal-insulator Transitions
Stacking Polymorphism of PtSe$_{2}$: Its Implication to Layer-dependent Metal-insulator Transitions Open
Using diffusion Monte Carlo (DMC) and density functional theory (DFT) calculations, we examined the structural stability and interlayer binding properties of PtSe$_2$, a representative transition metal dichalcogenide (TMD) with strong inte…
View article: Exploring interlayer coupling in the twisted bilayer <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>PtTe</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>
Exploring interlayer coupling in the twisted bilayer Open
We have investigated interlayer interactions in the bilayer PtTe2 system, which influence the electronic energy bands near the Fermi level. Our diffusion Monte Carlo (DMC) calculations for the high-symmetry bilayer stackings (AA, AB, AC) m…
View article: Toward improved property prediction of 2D materials using many-body quantum Monte Carlo methods
Toward improved property prediction of 2D materials using many-body quantum Monte Carlo methods Open
The field of two-dimensional (2D) materials has grown dramatically in the last two decades. 2D materials can be utilized for a variety of next-generation optoelectronic, spintronic, clean energy, and quantum computation applications. These…
View article: Exploring interlayer coupling in the twisted bilayer PtTe$_{2}$
Exploring interlayer coupling in the twisted bilayer PtTe$_{2}$ Open
We have investigated interlayer interactions in the bilayer PtTe$_{2}$ system, which influence the electronic energy bands near the Fermi levels. Our diffusion Monte Carlo (DMC) calculations for the high-symmetry bilayer stackings (AA, AB,…
View article: Stacking Faults and Topological Properties in MnBi<sub>2</sub>Te<sub>4</sub>: Reconciling Gapped and Gapless States
Stacking Faults and Topological Properties in MnBi<sub>2</sub>Te<sub>4</sub>: Reconciling Gapped and Gapless States Open
Despite theoretical predictions of a gapped surface state for the magnetic topological insulator MnBi2Te4 (MBT), there has been a series of experimental evidence pointing toward gapless states. Here, we theoretically explore how stacking f…
View article: Structural Stability of Graphene-Supported Pt Layers: Diffusion Monte Carlo and Density Functional Theory Calculations
Structural Stability of Graphene-Supported Pt Layers: Diffusion Monte Carlo and Density Functional Theory Calculations Open
In this study, we used a combination of diffusion Monte Carlo and density functional theory calculations to investigate the stability and interlayer binding of various layered structures of Pt atoms adsorbed on graphene. Our findings show …
View article: Procedures for Assessing the Stability of Proposed Topological Materials
Procedures for Assessing the Stability of Proposed Topological Materials Open
Here, we investigate the stability of MnPb2Bi2Te6 (MPBT), which is predicted to be a magnetic topological insulator (TI), using density functional theory calculations. Our analysis includes various measures such as enthalpies of formation,…
View article: Metastability and topology in the magnetic topological insulator MnBi$_{2}$Te$_{4}$
Metastability and topology in the magnetic topological insulator MnBi$_{2}$Te$_{4}$ Open
We study the effect of stacking faults on the topological properties of the magnetic topological insulator MnBi$_{2}$Te$_{4}$ (MBT) using density functional theory calculations and the Hubbard $U$ being tuned with many-body diffusion Monte…
View article: Procedures for assessing the stability of proposed topological materials
Procedures for assessing the stability of proposed topological materials Open
We investigate the stability of MnPb$_{2}$Bi$_{2}$Te$_{6}$ (MPBT), which is predicted to be a magnetic topological insulator (TI), using density functional theory calculations. Our analysis includes various measures such as enthalpies of f…
View article: Hydrogen separation with a graphenylene monolayer: Diffusion Monte Carlo study
Hydrogen separation with a graphenylene monolayer: Diffusion Monte Carlo study Open
We performed fixed-node diffusion Monte Carlo (DMC) calculations to investigate structural and energetic properties of graphenylene (GPNL), a two-dimensional network of sp2-bonded carbon atoms with large near-circular pores, and its H2 sep…
View article: Magnetic measures of purity for MnBi$_2$Te$_4$
Magnetic measures of purity for MnBi$_2$Te$_4$ Open
The intrinsically anti-ferromagnetic topological insulator, MnBi$_2$Te$_4$ (MBT), has garnered significant attention recently. The excitement for this layered van der Waals bonded compound stems from its potential to host numerous exotic t…
View article: Metastable Metallic Phase of a Bilayer Blue Phosphorene Induced by Interlayer Bonding and Intralayer Charge Redistributions
Metastable Metallic Phase of a Bilayer Blue Phosphorene Induced by Interlayer Bonding and Intralayer Charge Redistributions Open
We have carried out diffusion Monte Carlo calculations for an A1B-1-stacked bilayer blue phosphorene to find that it undergoes a semiconductor-metal transition as the interlayer distance decreases. While the most stable bilayer structure i…
View article: Fine Mapping and Candidate Gene Identification for the CapUp Locus Controlling Fruit Orientation in Pepper (Capsicum spp.)
Fine Mapping and Candidate Gene Identification for the CapUp Locus Controlling Fruit Orientation in Pepper (Capsicum spp.) Open
The orientation of fruits is a distinguishing morphological feature of pepper ( Capsicum spp.) varieties. The pendent (downward curved) growth of the fruit stalks, known as pedicels, is highly correlated with fruit weight and pedicel lengt…
View article: Adsorption of a single Pt atom on graphene: spin crossing between physisorbed triplet and chemisorbed singlet states
Adsorption of a single Pt atom on graphene: spin crossing between physisorbed triplet and chemisorbed singlet states Open
Diffusion Monte Carlo calculations show that a triplet-to-singlet spin crossing takes place in a Pt atom adsorbed on graphene.
View article: Competition between Hückel’s Rule and Jahn–Teller Distortion in Small Carbon Rings: A Quantum Monte Carlo Study
Competition between Hückel’s Rule and Jahn–Teller Distortion in Small Carbon Rings: A Quantum Monte Carlo Study Open
Structural properties and energetics of carbon rings are studied with the diffusion Monte Carlo (DMC) method. Our DMC-based geometry optimization reveals that both polyynic C4n and cumulenic C4n + 2 rings exhibit bond length alternations f…
View article: Frequency Analysis of Annual Maximum Wind Speed in Koreausing Mixture Distribution
Frequency Analysis of Annual Maximum Wind Speed in Koreausing Mixture Distribution Open
Recently, many studies on wind speed frequency analysis reported that mixture distribution is appropriate for the distribution of wind speed data. Since the annual maximum wind speed data are a subsample of wind speed data, the characteris…
View article: Control of CO<sub>2</sub> Capture Process on Transition-Metal-Porphyrin-like Graphene with Mechanical Strain
Control of CO<sub>2</sub> Capture Process on Transition-Metal-Porphyrin-like Graphene with Mechanical Strain Open
Nanomaterials, such as zeolites and metal-organic frameworks, have been studied for CO2 capture and sequestration. However, this application of nanomaterials has been limited largely due to their poor selectivity for flue gases as well as …
View article: Phase stability and interlayer interaction of blue phosphorene
Phase stability and interlayer interaction of blue phosphorene Open
In this work, we study the interlayer interactions between sheets of blue phosphorus with quantum Monte Carlo (QMC) methods. Here, we find that as previously observed in black phosphorus, interlayer binding of blue phosphorus cannot be des…
View article: Accuracy Improvement of Discharge Measurement with Modification of Distance Made Good Heading
Accuracy Improvement of Discharge Measurement with Modification of Distance Made Good Heading Open
Remote control boats equipped with an Acoustic Doppler Current Profiler (ADCP) are widely accepted and have been welcomed by many hydrologists for water discharge, velocity profile, and bathymetry measurements. The advantages of this techn…
View article: Method for Establishing a Flood Management of Urban Watershed With Underground Sluiceway
Method for Establishing a Flood Management of Urban Watershed With Underground Sluiceway Open
기후변화와 토지이용상태변화로 인한 도시유역의 홍수빈도와 규모의 증가는 도시유역 홍수관리에 대한 기존의 개념이 변화해야 함을 시사하고 있다. 본 논문은 배수펌프장과 대심도배수시설을 가진 도시유역에서의 치수계획 설정방법을 제시하는 연구로 목표 강우상태과 목표 침수특성치를 동시에 고려하여 치수계획을 수립하는 방법을 제시하였다. 2010년 9월 21일 목동 빗물펌프장 유역에서 발생한 실제 침수피해규모와 모의 결과를 비교하는 방법으로…
View article: Interlayer correlation between two $^4$He monolayers adsorbed on both sides of $\alpha$-graphyne
Interlayer correlation between two $^4$He monolayers adsorbed on both sides of $\alpha$-graphyne Open
Path-integral Monte Carlo calculations have been performed to study the $^4$He adsorption on both sides of a single $\alpha$-graphyne sheet. For investigation of the interlayer correlation between the upper and the lower monolayer of $^4$H…
View article: Interlayer correlation between two $^4$He monolayers adsorbed on both sides of $α$-graphyne
Interlayer correlation between two $^4$He monolayers adsorbed on both sides of $α$-graphyne Open
Path-integral Monte Carlo calculations have been performed to study the $^4$He adsorption on both sides of a single $α$-graphyne sheet. For investigation of the interlayer correlation between the upper and the lower monolayer of $^4$He ada…