469 citations · 5k across the 96 of their papers we have counts for
36 papers · 1 filter
Nonlinear and nonreciprocal transport effects in untwinned thin films of ferromagnetic Weyl metal SrRuO
Uddipta Kar, Elisha Cho-Hao Lu, Akhilesh Kr. Singh +12
The identification of distinct charge transport features, deriving from nontrivial bulk band and surface states, has been a challenging subject in the field of topological systems.…
Large shift current via in-gap and charge-neutral exciton excitations in BN nanotubes and single BN layer
Yi-Shiuan Huang, Yang-Hao Chan, Guang-Yu Guo
We perform {\it ab initio} many-body calculations to investigate the exciton shift current in small diameter zigzag BN nanotubes and also single BN sheet, using the GW plus Bethe-S…
Time-Reversal-Even Nonlinear Current Induced Spin Polarization
Cong Xiao, Weikang Wu, Hui Wang +6
We propose a time-reversal-even spin generation in second order of electric fields, which dominates the current induced spin polarization in a wide class of centrosymmetric nonmagn…
Riemannian geometry of resonant optical responses
Junyeong Ahn, Guang-Yu Guo, Naoto Nagaosa +1
The geometry of quantum states is well-established as a basis for understanding the response of electronic systems to static electromagnetic fields, as exemplified by the theory of…
Antiferromagnetism-induced second-order nonlinear optical responses of centrosymmetric bilayer CrI
Vijay Kumar Gudelli, Guang-Yu Guo
Antiferromagnetism (AF) in AB'-stacked centrosymmetric bilayer (BL) CrI breaks both spatial inversion () and time-reversal () symmetries but maintains the combined s…
Low-frequency divergence and quantum geometry of the bulk photovoltaic effect in topological semimetals
Junyeong Ahn, Guang-Yu Guo, Naoto Nagaosa
We study the low-frequency properties of the bulk photovoltaic effect in topological semimetals. The bulk photovoltaic effect is a nonlinear optical effect that generates DC photoc…
Tunable large spin Hall and spin Nernst effects in Dirac semimetals ZrXY (X=Si, Ge; Y=S, Se, Te)
Yun Yen, Guang-Yu Guo
The ZrSiS-type compounds are Dirac semimetals and have been attracting considerable interest in recent years due to their topological electronic properties and possible application…
Photonic Chern insulators made of gyromagnetic hyperbolic metamaterials
Ruei-Cheng Shiu, Hsun-Chi Chan, Hai-Xiao Wang +1
Controlling light propagation using artificial photonic crystals and electromagnetic metamaterials is an important topic in the vibrant field of photonics. Notably, chiral edge sta…
Inducing Kondo Screening of Vacancy Magnetic Moments in Graphene with Gating and Local Curvature
Yuhang Jiang, Jinhai Mao, Po-Wei Lo +7
In normal metals, the magnetic-moment of impurity-spins disappears below a characteristic Kondo temperature, TK. This marks the formation of a polarized cloud of conduction band el…
Magnetism and Magneto-optical Effects in Bulk and Few-layer CrI: A Theoretical GGA + U Study
Vijay Kumar Gudelli, Guang-Yu Guo
The latest discovery of ferromagnetism in atomically thin films of semiconductors CrGeTe and CrI has unleashed numerous opportunities for fundamental physics of mag…
Band topology in classical waves: Wilson-loop approach to topological numbers and fragile topology
Hai-Xiao Wang, Guang-Yu Guo, Jian-Hua Jiang
The rapid development of topological photonics and acoustics calls for accurate understanding of band topology in classical waves, which is not yet achieved in many situations. Her…
Large magneto-optical effects and magnetic anisotropy energy in two-dimensional CrGeTe
Yimei Fang, Shunqing Wu, Zi-Zhong Zhu +1
By performing systematic density functional calculations, here we study two relativity-induced properties of atomically thin ferromagnetic (FM) CrGeTe fil…
Modeling of gate controlled Kondo effect at carbon point-defects in graphene
Daniel May, Po-Wei Lo, Kira Deltenre +7
We study the magnetic properties in the vicinity of a single carbon defect in a monolayer of graphene. We include the unbound orbital and the vacancy induced bound state in…
Manipulating Anomalous Hall Antiferromagnets with Magnetic Fields
Hua Chen, Tzu-Cheng Wang, Di Xiao +3
The symmetry considerations that imply a non-zero anomalous Hall effect (AHE) in certain non-collinear antiferromagnets also imply both non-zero orbital magnetization and a net spi…
Tuning Topological Phase Transitions in Hexagonal Photonic Lattices Made of Triangular Rods
Hsun-Chi Chan, Guang-Yu Guo
In this paper, we study topological phases in a 2D photonic crystal with broken time () and parity () symmetries by performing calculations of band struct…
Quantum Critical Transition and Kondo Screening of Magnetic Moments in Graphene
Jinhai Mao, Yuhang Jiang, Po-Wei Lo +7
In normal metals, the magnetic moment of impurity spins disappears below a characteristic Kondo temperature, TK, where coupling with the conduction-band electrons produces an entan…
Topological phase transitions in an inverted InAs/GaSb quantum well driven by tilted magnetic fields
Hsiu-Chuan Hsu, Min-Jyun Jhang, Tsung-Wei Chen +1
The helical edge states in a quantum spin Hall insulator are presumably protected by time- reversal symmetry. However, even in the presence of magnetic field which breaks time-reve…
Conductance fluctuations in disordered 2D topological insulator wires: From quantum spin-Hall to ordinary quantum phases
Hsiu-Chuan Hsu, Ioannis Kleftogiannis, Guang-Yu Guo +1
Impurities and defects are ubiquitous in topological insulators (TIs) and thus understanding the effects of disorder on electronic transport is important. We calculate the distribu…
Large transverse Hall-like signal in topological Dirac semimetal Cd3As2
Shih-Ting Guo, R. Sankar, Yung-Yu Chien +5
Cadmium arsenide () is known for its inverted band structure and ultra-high electron mobility. It has been theoretically predicted and also confirmed by ARPES experim…
Manipulation of polarization and spatial properties of light beams with chiral metafilms
V. V. Klimov, I. V. Zabkov, A. A. Pavlov +3
Two-dimensional lattices of chiral nanoholes in a plasmonic film with lattice constants being slightly larger than light wavelength are proposed for effective control of polarizati…
Nonlinear Optical Properties of Transition Metal Dichalcogenide MX (M = Mo, W; X = S, Se) Monolayers and Trilayers from First-principles Calculations
Chung-Yu Wang, Guang-Yu Guo
Due to the absence of interlayer coupling and inversion symmetry, transition metal dichalcogenide (MX) semiconductor monolayers exhibit novel properties that are distinctly dif…
Gate-tunable Kondo resistivity and dephasing rate in graphene studied by numerical renormalization group calculations
Po-Wei Lo, Guang-Yu Guo, Frithjof B. Anders
We investigate the resistivity and dephasing rate in the Kondo regime due to magnetic impurities in graphene with different chemial potentials (). The Kondo effect due to either…
Plasmonic excitations in quantum-sized sodium nanoparticles studied by time-dependent density functional calculations
Jian-Hao Li, Michitoshi Hayashi, Guang-Yu Guo
The plasmonic properties of sphere-like bcc Na nanoclusters ranging from Na to Na have been studied by real-time time-dependent local density approximation calculati…
Dispersion relation, propagation length and mode conversion of surface plasmon polaritons in silver double-nanowire systems
Shulin Sun, Hung-Ting Chen, Wei-Jin Zheng +1
We study the surface plasmon modes in a silver double-nanowire system by employing the eigenmode analysis approach based on the finite element method. Calculated dispersion relatio…