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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…
Quasi-particle interferences of the Weyl semimetals TaAs and NbP
Guoqing Chang, Su-Yang Xu, Hao Zheng +12
The recent discovery of the first Weyl semimetal in TaAs provides the first observation of a Weyl fermion in nature. Such a topological semimetal features a novel type of anomalous…
Experimental Observation of Two Massless Dirac-Fermion Gases in Graphene-Topological Insulator Heterostructure
Guang Bian, Ting-Fung Chung, Chang Liu +19
Graphene and topological insulators (TI) possess two-dimensional Dirac fermions with distinct physical properties. Integrating these two Dirac materials in a single device creates…
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…
Topological Dirac States and Pairing Correlations in the Non-Centrosymmetric Superconductor PbTaSe2
Tay-Rong Chang, Peng-Jen Chen, Guang Bian +13
Superconductivity in topological band structures is a platform for many novel exotic quantum phenomena such as emergent supersymmetry. This potential nourishes the search for topol…
Electronic structure and relaxation dynamics in a superconducting topological material
Madhab Neupane, Yukiaki Ishida, Raman Sankar +9
Topological superconductors host new states of quantum matter which show a pairing gap in the bulk and gapless surface states providing a platform to realize Majorana fermions. Rec…
Observation of surface states derived from topological Fermi arcs in the Weyl semimetal NbP
Ilya Belopolski, Su-Yang Xu, Daniel Sanchez +16
The recent experimental discovery of a Weyl semimetal in TaAs provides the first observation of a Weyl fermion in nature and demonstrates a novel type of anomalous surface state ba…
Drumhead Surface States and Topological Nodal-Line Fermions in TlTaSe2
Guang Bian, Tay-Rong Chang, Hao Zheng +13
A topological nodal-line semimetal is a new condensed matter state with one-dimensional bulk nodal lines and two-dimensional drumhead surface bands. Based on first-principles calcu…
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…
Gigantic surface life-time of an intrinsic topological insulator revealed via time-resolved (pump-probe) ARPES
Madhab Neupane, Su-Yang Xu, Yukiaki Ishida +11
The interaction between light and novel two-dimensional electronic states holds promise to realize new fundamental physics and optical devices. Here, we use pump-probe photoemissio…
Fermi arc topology and interconnectivity in Weyl fermion semimetals TaAs, TaP, NbAs, and NbP
Chi-Cheng Lee, Su-Yang Xu, Shin-Ming Huang +11
The family of binary compounds including TaAs, TaP, NbAs, and NbP was recently discovered as the first realization of Weyl semimetals. In order to develop a comprehensive descripti…
Topological phase diagram and saddle point singularity in a tunable topological crystalline insulator
Madhab Neupane, Su-Yang Xu, R. Sankar +17
We report the evolution of the surface electronic structure and surface material properties of a topological crystalline insulator (TCI) Pb1-xSnxSe as a function of various materia…
Experimental discovery of a topological Weyl semimetal state in TaP
Su-Yang Xu, Ilya Belopolski, Daniel S. Sanchez +24
Weyl semimetals are expected to open up new horizons in physics and materials science because they provide the first realization of Weyl fermions and exhibit protected Fermi arc su…
Discovery of the topological surface state in a noncentrosymmetric superconductor BiPd
Madhab Neupane, Nasser Alidoust, Su-Yang Xu +9
Recently, noncentrosymmetric superconductor BiPd has attracted considerable research interest due to the possibility of being a topological superconductor. Here, we report a system…
Topological Nodal-Line Fermions in the Non-Centrosymmetric Superconductor Compound PbTaSe2
Guang Bian, Tay-Rong Chang, Raman Sankar +18
We report the identification of a Topological Nodal-Line Semimetal state in PbTaSe2.
Discovery of a Weyl Fermion semimetal state in NbAs
Su-Yang Xu, Nasser Alidoust, Ilya Belopolski +21
We report the discovery of Weyl semimetal NbAs featuring topological Fermi arc surface states.
Unconventional transformation of spin Dirac phase across a topological quantum phase transition
Su-Yang Xu, Madhab Neupane, Ilya Belopolski +15
The topology of a topological material can be encoded in its surface states. These surface states can only be removed by a bulk topological quantum phase transition into a trivial…
A new type of Weyl semimetal with quadratic double Weyl fermions in SrSi2
Shin-Ming Huang, Su-Yang Xu, Ilya Belopolski +11
We identify a Weyl semimetal state in an inversion breaking, stoichiometric compound strontium silicide, SrSi, with many new and novel properties that are distinct from the TaA…
Lifshitz transition and van Hove singularity in a Topological Dirac Semimetal
Su-Yang Xu, Chang Liu, I. Belopolski +20
A topological Dirac semimetal is a novel state of quantum matter which has recently attracted much attention as an apparent 3D version of graphene. In this paper, we report critica…
Observation of the Adler-Bell-Jackiw chiral anomaly in a Weyl semimetal
Chenglong Zhang, Su-Yang Xu, Ilya Belopolski +16
We report the experimental discovery of Adler-Bell-Jackiw chiral anomaly in a Weyl semimetal crystal.
Observation of Fermi Arc Surface States in a Topological Metal: A New Type of 2D Electron Gas beyond Z2 Topological Insulators
Su-Yang Xu, Chang Liu, Satya K. Kushwaha +15
In a topological insulator, it is the electrons on the surface or edge that carry the signature of topology. Recently, a novel topological state has been proposed in metals or semi…
Bulk crystal growth and electronic characterization of the 3D Dirac Semimetal Na3Bi
Satya K. Kushwaha, Jason W. Krizan, Benjamin E. Feldman +11
High quality hexagon plate-like Na3Bi crystals with large (001) plane surfaces were grown from a molten Na flux. The freshly cleaved crystals were analyzed by low temperature scann…