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Atomically thin obstructed atomic insulators with robust edge modes and quantized spin Hall effect
Rahul Verma, Shin-Ming Huang, Bahadur Singh
Symmetry-protected edge states serve as direct evidence of nontrivial electronic topology in atomically thin materials. Finding these states in experimentally realizable single-pha…
Role of effective mass anisotropy in realizing a hybrid nodal-line fermion state
Bikash Patra, Rahul Verma, Shin-Ming Huang +1
Understanding the role of lattice geometry in shaping topological states and their properties is of fundamental importance to condensed matter and device physics. Here we demonstra…
Topological spiral magnetism in the Weyl semimetal SmAlSi
Xiaohan Yao Jonathan Gaudet, Rahul Verma, David E. Graf +13
Weyl electrons are intensely studied due to novel charge transport phenomena such as chiral anomaly, Fermi arcs, and photogalvanic effect. Recent theoretical works suggest that Wey…
Topological theory of inversion-breaking charge-density-wave monolayer 1\textit{T}-TiSe
Ming-Chien Hsu, Bahadur Singh, Chuang-Han Hsu +3
A charge density wave (CDW) of a nonzero ordering vector couple electronic states at and statically, giving rise to a reduced Bril…
A new noncollinear ferromagnetic Weyl semimetal with anisotropic anomalous Hall effect
Hung-Yu Yang, Bahadur Singh, Jonathan Gaudet +18
A developing frontier in condensed matter physics is the emergence of novel electromagnetic responses, such as topological and anomalous Hall effect (AHE), in ferromagnetic Weyl se…
Discovery of topological Weyl fermion lines and drumhead surface states in a room temperature magnet
Ilya Belopolski, Kaustuv Manna, Daniel S. Sanchez +20
Topological matter is known to exhibit unconventional surface states and anomalous transport owing to unusual bulk electronic topology. In this study, we use photoemission spectros…
Transition from Intrinsic to Extrinsic Anomalous Hall Effect in the Ferromagnetic Weyl Semimetal PrAlGeSi
Hung-Yu Yang, Bahadur Singh, Baozhu Lu +10
Recent reports of a large anomalous Hall effect (AHE) in ferromagnetic Weyl semimetals (FM WSM) have led to a resurgence of interest in this enigmatic phenomenon. However, due to a…
Prediction of three-fold fermions in a nearly-ideal Dirac semimetal BaAgAs
Sougata Mardanya, Bahadur Singh, Shin-Ming Huang +5
Materials with triply-degenerate nodal points in their low-energy electronic spectrum produce crystalline-symmetry-enforced three-fold fermions, which conceptually lie between the…
Aspects of symmetry and topology in the charge density wave phase of 1T-TiSe2
Shin-Ming Huang, Su-Yang Xu, Bahadur Singh +5
The charge density wave (CDW) in 1T-TiSe2 accompanied by the periodic lattice distortion has a nontrivial symmetry configuration. The symmetry is important as an indication of the…
A three-dimensional magnetic topological phase
Ilya Belopolski, Daniel S. Sanchez, Guoqing Chang +16
We use photoemission spectroscopy to discover the first topological magnet in three dimensions, the material CoMnGa.
Large Fermi Arcs in Unconventional Weyl Semimetal RhSi
Guoqing Chang, Su-Yang Xu, Benjamin J. Wieder +8
The theoretical proposal of chiral fermions in topological semimetals has led to a significant effort towards their experimental realization. In particular, the Fermi surfaces of c…
Discovery of Weyl fermion semimetals and topological Fermi arc states
M. Zahid Hasan, Su-Yang Xu, Ilya Belopolski +1
Weyl semimetals are conductors whose low-energy bulk excitations are Weyl fermions, whereas their surfaces possess metallic Fermi arc surface states. These Fermi arc surface states…
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…
Theoretical prediction of magnetic and noncentrosymmetric Weyl fermion semimetal states in the R-Al-X family of compounds (R=rare earth, Al=aluminium, X=Si, Ge)
Guoqing Chang, Bahadur Singh, Su-Yang Xu +18
Weyl semimetals are novel topological conductors that host Weyl fermions as emergent quasiparticles. While the Weyl fermions in high-energy physics are strictly defined as the mass…
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…
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…
Atomic Scale Visualization of Quantum Interference on a Weyl Semimetal Surface by Scanning Tunneling Microscopy/Spectroscopy
Hao Zheng, Su-Yang Xu, Guang Bian +19
Weyl semimetals may open a new era in condensed matter physics, materials science and nanotech after graphene and topological insulators. We report the first atomic scale view of t…
Spin polarization and texture of the Fermi arcs in the Weyl Fermion semimetal TaAs
Su-Yang Xu, Ilya Belopolski, Daniel S. Sanchez +25
A Weyl semimetal is a new state of matter that host Weyl fermions as quasiparticle excitations. The Weyl fermions at zero energy correspond to points of bulk band degeneracy, Weyl…
Arc-tunable Weyl Fermion metallic state in MoWTe
Tay-Rong Chang, Su-Yang Xu, Guoqing Chang +13
Weyl semimetals may open a new era in condensed matter physics because they provide the first example of Weyl fermions, realize a new topological classification even though the sys…
Theoretical Discovery/Prediction: Weyl Semimetal states in the TaAs material (TaAs, NbAs, NbP, TaP) class
Shin-Ming Huang, Su-Yang Xu, Ilya Belopolski +9
The recent discoveries of Dirac fermions in graphene and on the surface of topological insulators have ignited worldwide interest in physics and materials science. A Weyl semimetal…
Ferromagnetism and quantum anomalous Hall effect in one-side-saturated buckled honeycomb lattices
Shin-Ming Huang, Shi-Ting Lee, Chung-Yu Mou
The recently synthesized silicene as well as theoretically discussed germanene are examples of buckled honeycomb structures. The buckled structures allow one to manipulate asymmetr…
Stability of Z topological order in the presence of vacancy-induced impurity band
Shi-Ting Lee, Shin-Ming Huang, Chung-Yu Mou
Although topological insulators (TIs) are known to be robust against non-magnetic perturbations and exhibit edge or surface states as their distinct feature, experimentally it is k…