3.3k citations · 10.6k across the 53 of their papers we have counts for
53 papers
Tomography Scan of Charge Density Wave in NbSe2
Jyun-Yu Wu, Yung-Ting Lee, Guan-Hao Chen +15
Charge density wave (CDW) resulted from a small distortion in the lattice is able to create new orders beyond the original lattice. In 2H-NbSe2, one of the layered transition metal…
Revealing the Charge Density Wave caused by Peierls instability in two-dimensional NbSe
Yung-Ting Lee, Po-Tuan Chen, Zheng-Hong Li +10
The formation of a charge density wave (CDW) in two-dimensional (2D) materials caused by Peierls instability is a controversial topic. This study investigates the extensively debat…
Atomically-thin metallic Si and Ge allotropes with high Fermi velocities
Chin-En Hsu, Yung-Ting Lee, Chieh-Chun Wang +4
Silicon and germanium are the well-known materials used to manufacture electronic devices for the integrated circuits but they themselves are not considered as promising options fo…
Relativistic horizon of interacting Weyl fermions in condensed matter systems
Wei-Chi Chiu, Guoqing Chang, Gennevieve Macam +12
The intersections of topology, geometry and strong correlations offer many opportunities for exotic quantum phases to emerge in condensed matter systems. Weyl fermions, in particul…
The hidden competing phase revealed by first-principles calculations of phonon instability in the nearly optimally doped cuprate LaSrCuO
Chi-Cheng Lee, Ji-Yao Chiu, Yukiko Yamada-Takamura +1
The representative cuprate, LaMCuO, with M = Sr and is studied via first-principles calculations in the high-temperature tetragonal (HTT), low-temperature…
Unfolding optical transition weights of impurity materials for first-principles LCAO electronic structure calculations
Yung-Ting Lee, Chi-Cheng Lee, Masahiro Fukuda +1
A method to analyze optical transitions is developed by combining the Kubo-Greenwood formula with the unfolding method to construct an unfolded electronic band structure with optic…
Photocurrent-driven transient symmetry breaking in the Weyl semimetal TaAs
N Sirica, P. P. Orth, M. S. Scheurer +23
Symmetry plays a central role in conventional and topological phases of matter, making the ability to optically drive symmetry change a critical step in developing future technolog…
Emergence of Nearly Flat Bands through an Embedded Kagome Lattice in an Epitaxial Two-dimensional Ge Layer on ZrB2(0001)
Antoine Fleurence, Chi-Cheng Lee, Rainer Friedlein +8
Ge atoms segregating on zirconium diboride thin films grown on Ge(111) were found to crystallize into a two-dimensional bitriangular structure which was recently predicted to be a…
Partitioning interatomic force constants for first-principles phonon calculations: Applications to NaCl, PbTiO, monolayer CrI, and twisted bilayer graphene
Chi-Cheng Lee, Chin-En Hsu, Hung-Chung Hsueh
First-principles phonon calculations have been widely performed for studying vibrational properties of condensed matter, where the dynamical matrix is commonly constructed via supe…
Hidden mechanism for embedding the flat bands of Lieb, kagome, and checkerboard lattices in other structures
Chi-Cheng Lee, Antoine Fleurence, Yukiko Yamada-Takamura +1
The interplay of hopping parameters that can give rise to flat bands in consequence of quantum interference in electronic, photonic, and other interesting materials has become an e…
Tight-binding calculations of optical matrix elements for conductivity using non-orthogonal atomic orbitals: Anomalous Hall conductivity in bcc Fe
Chi-Cheng Lee, Yung-Ting Lee, Masahiro Fukuda +1
We present a general formula for the tight-binding representation of momentum matrix elements needed for calculating the conductivity based on the Kubo-Greenwood formula using atom…
Non-saturating Quantum Magnetization in Weyl semimetal TaAs
Cheng-Long Zhang, C. M. Wang, Zhujun Yuan +8
Detecting the spectroscopic signatures of Dirac-like quasiparticles in emergent topological materials is crucial for searching their potential applications. Magnetometry is a power…
Peculiar bonding associated with atomic doping and hidden honeycombs in borophene
Chi-Cheng Lee, Baojie Feng, Marie D'angelo +6
Engineering atomic-scale structures allows great manipulation of physical properties and chemical processes for advanced technology. We show that the B atoms deployed at the center…
Topological superconductor in quasi-one-dimensional Tl2-xMo6Se6
Shin-Ming Huang, Chuang-Han Hsu, Su-Yang Xu +4
We propose that the quasi-one-dimensional molybdenum selenide compound Tl2-xMo6Se6 is a time-reversal-invariant topological superconductor induced by inter-sublattice pairing, even…
Realization of intrinsically broken Dirac cones in graphene via the momentum-resolved electronic band structure
Chi-Cheng Lee, Masahiro Fukuda, Yung-Ting Lee +1
A way to represent the band structure that distinguishes between energy-momentum and energy-crystal momentum relationships is proposed upon the band-unfolding concept. This momentu…
Atomic-scale visualization of surface-assisted orbital order
Howon Kim, Yasuo Yoshida, Chi-Cheng Lee +6
Orbital-related physics attracts growing interest in condensed matter research, but direct real-space access of the orbital degree of freedom is challenging. Here we report a first…
Discovery of a new type of topological Weyl fermion semimetal state in MoWTe
Ilya Belopolski, Daniel S. Sanchez, Yukiaki Ishida +23
The recent discovery of a Weyl semimetal in TaAs offers the first Weyl fermion observed in nature and dramatically broadens the classification of topological phases. However, in Ta…
Single-particle excitation of core states in epitaxial silicene
Chi-Cheng Lee, Jun Yoshinobu, Kozo Mukai +6
Recent studies of core-level X-ray photoelectron spectroscopy (XPS) spectra of silicene on ZrB(0001) were found to be inconsistent with the density of states (DOS) of a planar-…
Core level binding energies in solids from first-principles
Taisuke Ozaki, Chi-Cheng Lee
A general method is presented to calculate absolute binding energies of core levels in metals and insulators, based on a penalty functional and an exact Coulomb cutoff method in a…
Measuring Chern numbers above the Fermi level in the Type II Weyl semimetal MoWTe
Ilya Belopolski, Su-Yang Xu, Yukiaki Ishida +30
It has recently been proposed that electronic band structures in crystals give rise to a previously overlooked type of Weyl fermion, which violates Lorentz invariance and, conseque…
Signatures of the Adler-Bell-Jackiw chiral anomaly in a Weyl Fermion semimetal
Chenglong Zhang, Su-Yang Xu, Ilya Belopolski +20
Weyl semimetals provide the realization of Weyl fermions in solid-state physics. Among all the physical phenomena that are enabled by Weyl semimetals, the chiral anomaly is the mos…
Criteria for directly detecting topological Fermi arcs in Weyl semimetals
Ilya Belopolski, Su-Yang Xu, Daniel Sanchez +16
The recent discovery of the first Weyl semimetal in TaAs provides the first observation of a Weyl fermion in nature and demonstrates a novel type of anomalous surface state, the Fe…
Unoccupied electronic structure and signatures of topological Fermi arcs in the Weyl semimetal candidate MoWTe
Ilya Belopolski, Su-Yang Xu, Yukiaki Ishida +30
Weyl semimetals have sparked intense research interest, but experimental work has been limited to the TaAs family of compounds. Recently, a number of theoretical works have predict…
A strongly robust Weyl fermion semimetal state in TaS
Guoqing Chang, Su-Yang Xu, Daniel S. Sanchez +11
Weyl semimetals are extremely interesting. Although the first Weyl semimetal was recently discovered in TaAs, research progress is still significantly hindered due to the lack of r…