727 citations · 3.7k across the 40 of their papers we have counts for
28 papers · 1 filter
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…
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,…
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…
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…
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…
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…
Large Frequency Change with Thickness in Interlayer Breathing Mode - Significant Interlayer Interactions in Few Layer Black Phosphorus
Xin Luo, Xin Lu, Gavin Kok Wai Koon +4
Bulk black phosphorus (BP) consists of puckered layers of phosphorus atoms. Few-layer BP, obtained from bulk BP by exfoliation, is an emerging candidate as a channel material in po…
Quantum-confinement and Structural Anisotropy result in Electrically-Tunable Dirac Cone in Few-layer Black Phosphorous
Kapildeb Dolui, Su Ying Quek
2D materials are well-known to exhibit interesting phenomena due to quantum confinement. Here, we show that quantum confinement, together with structural anisotropy, result in an e…
Large magnetoresistance from long-range interface coupling in armchair graphene nanoribbon junctions
Suchun Li, Young-Woo Son, Su Ying Quek
In recent years, bottom-up synthesis procedures have achieved significant advancements in atomically-controlled growth of several-nanometer-long graphene nanoribbons with armchair-…
Band Structure Mapping of Bilayer Graphene via Quasiparticle Scattering
Matthew Yankowitz, Joel I-Jan Wang, Suchun Li +7
A perpendicular electric field breaks the layer symmetry of Bernal-stacked bilayer graphene, resulting in the opening of a band gap and a modification of the effective mass of the…
Effects of Lower Symmetry and Dimensionality on Raman Spectra in 2D WSe2
Xin Luo, Yanyuan Zhao, Jun Zhang +4
We report the observation and interpretation of new Raman peaks in few-layer tungsten diselenide (WSe2), induced by the reduction of symmetry going from 3D to 2D. In general, Raman…
Interface Effects on Tunneling Magnetoresistance in Organic Spintronics with Flexible Amine-Au Links
Narjes Gorjizadeh, Su Ying Quek
Organic spintronics is a promising emerging field, but the sign of the tunneling magnetoresistance (TMR) is highly sensitive to interface effects, a crucial hindrance to applicatio…
Anomalous Frequency Trends in MoS2 Thin Films Attributed to Surface Effects
Xin Luo, Yanyuan Zhao, Jun Zhang +2
The layered dichalcogenide MoS2 has many unique physical properties in low dimensions. Recent experimental Raman spectroscopies report an anomalous blue shift of the in-plane E2g1…