727 citations · 3.7k across the 40 of their papers we have counts for
40 papers
Observation and Control of the Magnetic Photogalvanic Effect from Strongly Bound Excitons
Xianfan Nie, Tarun Patel, Hyunggeun Lee +11
Photogalvanic effects arising from the quantum geometry of noncentrosymmetric materials are promising for next-generation light-harvesting devices that do not require a built-in el…
Defect-Mediated Phase Engineering of 2D Ag at the Graphene/SiC Interface
Arpit Jain, Boyang Zheng, Sawani Datta +23
Atomically thin silver (Ag) films offer unique opportunities in plasmonic, quantum optics, and energy harvesting, yet conventional growth methods struggle to achieve structural con…
Quantum Geometric Advantage of the Correlated Exciton State in Non-linear Optics
MingRui Lai, Fengyuan Xuan, Su Ying Quek
The concept of quantum geometry for single-particle states has revolutionized our interpretation of several emergent properties in condensed matter. However, a description of the q…
Quantum Defects in 2D Transition Metal Dichalcogenides for Terahertz Technologies
Jingda Zhang, Su Ying Quek
Substitutional transition metal (TM) point defects have recently been controllably introduced in two-dimensional (2D) transition metal dichalcogenides. We identify quantum defect c…
Exciton-Enhanced Spontaneous Parametric Down-Conversion in Two-Dimensional Crystals
Fengyuan Xuan, MingRui Lai, Yaze Wu +1
We show that excitonic resonances and interexciton transitions can enhance the probability of spontaneous parametric down-conversion, a second-order optical response which generate…
Data-driven discovery of high performance layered van der Waals piezoelectric NbOI2
Yaze Wu, Ibrahim Abdelwahab, Ki Chang Kwon +8
Using high-throughput first-principles calculations to search for layered van der Waals materials with the largest piezoelectric stress coefficients, we discover NbOI2 to be the on…
Effects of Steric Factors on Molecular Doping to MoS
Serrae N. Reed, Yifeng Chen, Milad Yarali +5
Surface functionalization of two-dimensional (2D) materials with organic electron donors (OEDs) is a powerful method to modulate the electronic properties of the material. However,…
Photo-Physical Characteristics of Boron Vacancy-Derived Defect Centers in Hexagonal Boron Nitride
Yifeng Chen, Su Ying Quek
Single photon emitter (SPE) sources are important building blocks for photonics-based quantum technologies. Recently, the highly bright and versatile SPEs from the two-dimensional…
Valley-Filling Instability and Critical Magnetic Field for Interaction-Enhanced Zeeman Response in Doped WSe Monolayers
Fengyuan Xuan, Su Ying Quek
Carrier-doped transition metal dichalcogenide (TMD) monolayers are of great interest in valleytronics due to the large Zeeman response (g-factors) in these spin-valley-locked mater…
Tunable Two-Dimensional Group-III Metal Alloys
Siavash Rajabpour, Alexander Vera, Wen He +20
Chemically stable quantum-confined 2D metals are of interest in next-generation nanoscale quantum devices. Bottom-up design and synthesis of such metals could enable the creation o…
Spin-dependent Tunneling Barriers in CoPc/VSe2 from Many-Body Interactions
Runrun Xu, Fengyuan Xuan, Su Ying Quek
Mixed-dimensional magnetic heterostructures are intriguing, newly available platforms to explore quantum physics and its applications. Using state-of-the-art many-body perturbation…
Isolated Flat Bands and Physics of Mixed Dimensions in a 2D Covalent Organic Framework
Juefan Wang, Su Ying Quek
We demonstrate that it is possible to rationally incorporate both an isolated flat band, and the physics of zero dimensions (0D), one dimension (1D), and two dimensions (2D) in a s…
Hydrogen adatoms on graphene: the role of hybridization and lattice distortion
Keian Noori, Su Ying Quek, Aleksandr Rodin
Hydrogen adatoms on graphene are investigated using DFT and analytical approaches. We demonstrate that the level of lattice deformation due to the hydrogen adsorption does not subs…
Near Unity Molecular Doping Efficiency in Monolayer MoS2
Milad Yarali, Yiren Zhong, Serrae N. Reed +11
Surface functionalization with organic electron donors (OEDs) is an effective doping strategy for two-dimensional (2D) materials, which can achieve doping levels beyond those possi…
Dielectric Screening by 2D Substrates
Keian Noori, Nicholas Lin Quan Cheng, Fengyuan Xuan +1
Two-dimensional (2D) materials are increasingly being used as active components in nanoscale devices. Many interesting properties of 2D materials stem from the reduced and highly n…
Valley Zeeman effect and Landau levels in Two-Dimensional Transition Metal Dichalcogenides
Fengyuan Xuan, Su Ying Quek
This paper presents a theoretical description of both the valley Zeeman effect (g-factors) and Landau levels in two-dimensional H-phase transition metal dichalcogenides (TMDs) usin…
Graphene-mediated interaction between adsorbed impurities
Keian Noori, Hillol Biswas, Su Ying Quek +1
Interaction between adsorbed atoms in graphene is studied using a combination of DFT and the path integral formalism. Our results reveal a complex non-monotonic interaction profile…
Bulk-mediated interaction between impurities in 1D atomic chains
Aleksandr Rodin, Keian Noori, Su Ying Quek
A combination of numerical and analytical methods is employed to study a one-dimensional chain of identical atoms with adsorbates. We show that the electron-mediated interaction en…
Quasiparticle Levels at Large Interface Systems from Many-body Perturbation Theory: the XAF-GW method
Fengyuan Xuan, Yifeng Chen, Su Ying Quek
We present a fully ab initio approach based on many-body perturbation theory in the GW approximation, to compute the quasiparticle levels of large interface systems without signifi…
First Principles Study of Intrinsic and Extrinsic Point Defects in Monolayer WSe2
Yu Jie Zheng, Su Ying Quek
We present a detailed first principles density functional theory study of intrinsic and extrinsic point defects in monolayer (ML) WSe2. Among the intrinsic point defects, Se vacanc…
Point Defects and Localized Excitons in 2D WSe2
Yu Jie Zheng, Yifeng Chen, Yu Li Huang +8
Identifying the point defects in 2D materials is important for many applications. Recent studies have proposed that W vacancies are the predominant point defect in 2D WSe2, in cont…
van der Waals Bonded Co/h-BN Contacts to Ultrathin Black Phosphorus Devices
Ahmet Avsar, Jun Y. Tan, Luo Xin +6
Due to the chemical inertness of 2D hexagonal-Boron Nitride (h-BN), few atomic-layer h-BN is often used to encapsulate air-sensitive 2D crystals such as Black Phosphorus (BP). Howe…
Energy Level Alignment at Hybridized Organic-metal Interfaces: the Role of Many-electron Effects
Yifeng Chen, Isaac Tamblyn, Su Ying Quek
Hybridized molecule/metal interfaces are ubiquitous in molecular and organic devices. The energy level alignment (ELA) of frontier molecular levels relative to the metal Fermi leve…
Origin of Contact Resistance at Ferromagnetic Metal-Graphene Interfaces
Khoong Hong Khoo, Wei Sun Leong, John T. L. Thong +1
Edge contact geometries are thought to yield ultralow contact resistances in most non-ferromagnetic metal-graphene interfaces owing to their large metal-graphene coupling strengths…