Publications (20)
Gate-tunable artificial nucleus in graphene
Mykola Telychko, Keian Noori, Hillol Biswas +12
We report an atomically-precise integration of individual nitrogen (N) dopant as an in-plane artificial nucleus in a graphene device by atomic implantation to probe its gate-tunabl…
A symmetric fractional-order reduction method for direct nonuniform approximations of semilinear diffusion-wave equations
Pin Lyu, Seakweng Vong
We introduce a symmetric fractional-order reduction (SFOR) method to construct numerical algorithms on general nonuniform temporal meshes for semilinear fractional diffusion-wave e…
Atomically-precise Vacancy-assembled Quantum Antidots
Hanyan Fang, Harshitra Mahalingam, Xinzhe Li +16
Patterning antidots ("voids") into well-defined antidot lattices creates an intriguing class of artificial structures for the periodic modulation of 2D electron systems, leading to…
A fast implicit difference scheme for solving the generalized time-space fractional diffusion equations with variable coefficients
Xian-Ming Gu, Ting-Zhu Huang, Yong-Liang Zhao +2
In this paper, we first propose an unconditionally stable implicit difference scheme for solving generalized time-space fractional diffusion equations (GTSFDEs) with variable coeff…
Size effect of Ruderman-Kittel-Kasuya-Yosida interaction mediated by electrons in nanoribbons
Shuo Mi, Shuo-Hong Yuan, Pin Lyu
We calculated the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction between the magnetic impurities mediated by electrons in nanoribbons. It was shown that the RKKY interaction is s…
Discrete gradient structure of a second-order variable-step method for nonlinear integro-differential models
Hong-lin Liao, Nan Liu, Pin Lyu
The discrete gradient structure and the positive definiteness of discrete fractional integrals or derivatives are fundamental to the numerical stability in long-time simulation of…
A linearized second-order scheme for nonlinear time fractional Klein-Gordon type equations
Pin Lyu, Seakweng Vong
We consider difference schemes for nonlinear time fractional Klein-Gordon type equations in this paper. A linearized scheme is proposed to solve the problem. As a result, iterative…
GitTaskBench: A Benchmark for Code Agents Solving Real-World Tasks Through Code Repository Leveraging
Ziyi Ni, Huacan Wang, Shuo Zhang +15
Beyond scratch coding, exploiting large-scale code repositories (e.g., GitHub) for practical tasks is vital in real-world software development, yet current benchmarks rarely evalua…
RepoMaster: Autonomous Exploration and Understanding of GitHub Repositories for Complex Task Solving
Huacan Wang, Ziyi Ni, Shuo Zhang +11
The ultimate goal of code agents is to solve complex tasks autonomously. Although large language models (LLMs) have made substantial progress in code generation, real-world tasks t…
Second-order and nonuniform time-stepping schemes for time fractional evolution equations with time-space dependent coefficients
Pin Lyu, Seakweng Vong
The numerical analysis of time fractional evolution equations with the second-order elliptic operator including general time-space dependent variable coefficients is challenging, e…
A fast linearized finite difference method for the nonlinear multi-term time-fractional wave equation
Pin Lyu, Yuxiang Liang, Zhibo Wang
In this paper, we study a fast and linearized finite difference method to solve the nonlinear time-fractional wave equation with multi fractional orders. We first propose a discret…
An efficient second-order convergent scheme for one-side space fractional diffusion equations with variable coefficients
Xue-lei Lin, Pin Lyu, Michael K. Ng +2
In this paper, a second order finite difference scheme is investigated for time-dependent one-side space fractional diffusion equations with variable coefficients. The existing sch…
Electronic Self-passivation of Single Vacancy in Black Phosphorus via a Controlled Ionization
Hanyan Fang, Aurelio Gallardo, Dikshant Dulal +11
We report that mono-elemental black phosphorus presents a new electronic self-passivation scheme of single vacancy (SV). By means of low-temperature scanning tunneling microscopy a…
On a second order scheme for space fractional diffusion equations with variable coefficients
Seakweng Vong, Pin Lyu
We study a second order scheme for spatial fractional differential equations with variable coefficients. Previous results mainly concentrate on equations with diffusion coefficient…
Tunneling magnetoresistance in diluted magnetic semiconductor tunnel junctions
Pin Lyu, Kyungsun Moon
Using the spin-polarized tunneling model and taking into account the basic physics of ferromagnetic semiconductors, we study the temperature dependence of the tunneling magnetoresi…
SDO: Structure-Aware Data Organization for Efficient LLM Post-Training
Jinliang Gao, Ning Yang, Hai Wang +2
The paper introduces SDO, a plug‑and‑play framework that dynamically organizes training data for large language model post‑training by using exposure‑driven feedback and K‑nearest‑…
Visualization of Strain-Induced Landau Levels in a Graphene - Black Phosphorus Heterostructure
Thi-Hai-Yen Vu, Pin Lyu, Na Hyun Jo +8
Strain-induced pseudo magnetic fields offer the possibility of realizing zero magnetic field Quantum Hall effect in graphene, possibly up to room temperature, representing a promis…
Giant gate-tunable renormalization of spin-correlated flat-band states and bandgap in a 2D magnetic insulator
Pin Lyu, Joachim Sødequist, Xiaoyu Sheng +8
Emergent quantum phenomena in two-dimensional van der Waal (vdW) magnets are largely governed by the interplay between the exchange and Coulomb interactions. The ability to tune th…
A high-order and fast scheme with variable time steps for the time-fractional Black-Scholes equation
Kerui Song, Pin Lyu
In this paper, a high-order and fast numerical method is investigated for the time-fractional Black-Scholes equation. In order to deal with the typical weak initial singularities o…
Ferromagnetism in diluted magnetic semiconductor quantum dot arrays embedded in semiconductors
Pin Lyu, Kyungsun Moon
We present an Anderson-type model Hamiltonian with exchange coupling between the localized spins and the confined holes in the quantum dots to study the ferromagnetism in diluted m…