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Quantized Photocurrents in Gapless Topological Matter
Byunghoon Kim, Tenzin Norden, Mohammad Yahyavi +17
The quantum Hall effect establishes that topology can fix a material response to integer multiples of fundamental constants when an energy gap isolates the relevant symmetry-protec…
Defects Engineering of ZrTe5 for Stabilizing Ideal Topological States
Chia-Hsiu Hsu, Zezhi Wang, Sen Shao +6
ZrTe5 is a highly tunable, high-mobility topological material that hosts a rich variety of quantum phenomena, making it a promising platform for next-generation quantum technologie…
Wavefunction-Free Approach for Predicting Nonlinear Responses in Weyl Semimetals
Mohammad Yahyavi, Ilya Belopolski, Yuanjun Jin +15
By sidestepping the intractable calculations of many-body wavefunctions, density functional theory (DFT) has revolutionized the prediction of ground states of materials. However, p…
Interlayer Charge-density-wave Vector Phase Induced Structural Chirality
Sen Shao, Wei-Chi Chiu, Tao Hou +21
Chiral charge density waves (CDWs) have attracted intense interest due to their exotic quantum properties, yet the microscopic origin of structural chirality emerging from correlat…
Dynamic transition and Galilean relativity of current-driven skyrmions
Max T. Birch, Ilya Belopolski, Yukako Fujishiro +6
The coupling of conduction electrons and magnetic textures leads to quantum transport phenomena described by the language of emergent electromagnetic fields [1-3]. For magnetic sky…
Intertwining of magnetism and charge ordering in kagome FeGe
Sen Shao, Jia-Xin Yin, Ilya Belopolski +11
Recent experiments report a charge density wave (CDW) in the antiferromagnet FeGe, but the nature of the charge ordering and the associated structural distortion remains elusive. W…
Visualizing the out-of-plane electronic dispersions in an intercalated transition metal dichalcogenide
Xian P. Yang, Harrison LaBollita, Zi-Jia Cheng +17
Layered transition metal dichalcogenides have rich phase diagram and they feature two dimensionality on numerous physical properties. Co1/3NbS2 is one of the newest members of this…
Helicoid-arc van Hove singularities in topological chiral crystals
Daniel S. Sanchez, Tyler A. Cochran, Ilya Belopolski +14
Van Hove singularity are electronic instabilities that lead to many fascinating interactions, such as superconductivity and charge-density waves. And despite much interest, the nex…
Weyl, Dirac and high-fold chiral fermions in topological quantum materials
M. Zahid Hasan, Guoqing Chang, Ilya Belopolski +3
Quantum materials hosting Weyl fermions have opened a new era of research in condensed matter physics. First proposed in 1929 in particle physics, Weyl fermions have yet to be obse…
Spin-orbit quantum impurity and quantization in a topological magnet
Jia-Xin Yin, Nana Shumiya, Yuxiao Jiang +22
Quantum states induced by single-atomic impurities are at the frontier of physics and material science. While such states have been reported in high-temperature superconductors and…
Observation of Weyl fermions in a magnetic non-centrosymmetric crystal
Daniel S. Sanchez, Guoqing Chang, Ilya Belopolski +15
Characterized by the absence of inversion symmetry, non-centrosymmetric materials are of great interest because they exhibit ferroelectricity, second harmonic generation, emergent…
Discovery of a quantum limit Chern magnet TbMn6Sn6
Jia-Xin Yin, Wenlong Ma, Tyler A. Cochran +23
The quantum level interplay between geometry, topology, and correlation is at the forefront of fundamental physics. Owing to the unusual lattice geometry and breaking of time-rever…
Visualizing higher-fold topology in chiral crystals
Tyler A Cochran, Ilya Belopolski, Kaustuv Manna +21
Novel topological phases of matter are fruitful platforms for the discovery of unconventional electromagnetic phenomena. Higher-fold topology is one example, where the low-energy d…
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…
Spin-orbit quantum impurity in a topological kagome magnet
Jia-Xin Yin, Nana Shumiya, Yuxiao Jiang +22
Quantum states induced by single-atomic-impurities are the current frontier of material and information science. Recently the spin-orbit coupled correlated kagome magnets are emerg…
Tunable Berry Curvature Through Magnetic Phase Competition in a Topological Kagome Magnet
Z. Guguchia, J. Verezhak, D. Gawryluk +19
Magnetic topological phases of quantum matter are an emerging frontier in physics and material science. Along these lines, several kagome magnets have appeared as the most promisin…
Crystal growth and quantum oscillations in the topological chiral semimetal CoSi
Xitong Xu, Xirui Wang, Tyler A. Cochran +10
We survey the electrical transport properties of the single-crystalline, topological chiral semimetal CoSi which was grown via different methods. High-quality CoSi single crystals…
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…
A novel artificial condensed matter lattice and a new platform for one-dimensional topological phases
Ilya Belopolski, Su-Yang Xu, Nikesh Koirala +22
Engineered lattices in condensed matter physics, such as cold atom optical lattices or photonic crystals, can have fundamentally different properties from naturally-occurring elect…
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…
Topological Weyl phase transition in MoWTe
Ilya Belopolski, Daniel S. Sanchez, Yukiaki Ishida +21
Topological phases of matter exhibit phase transitions between distinct topological classes. These phase transitions are exotic in that they do not fall within the traditional Ginz…
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…