Fermiology Evolution of Weyl Semimetals in Transition Metal Pnictide Family

The discovery of quantum materials with non-trivial topological electronic structures has recently ignited worldwide interest in physics and materials science 1,2 . Topological Weyl semimetals (TWSs) represent a novel state of topological quantum matter 3-6 which not only possesses Weyl fermions (intriguing massless chiral particles that can be viewed as magnetic monopoles in momentum space) in the bulk and unique Fermi-arcs generated by topological surface states, but also exhibits appealing physical properties such as extremely large magnetoresistance and ultra-high carrier mobility 7-10 . Here, by performing angle-resolved photoemission spectroscopy (ARPES) on NbP and TaP, we directly observed their band structures with characteristic Fermi-arcs of TWSs. Additionally, by systematically investigating NbP, TaP and TaAs from the same transition metal monopnictide family, we discovered their Fermiology evolution with spin-orbit coupling (SOC) strength. Our experimental findings not only reveal the mechanism to realize and fine-tune the electronic structures of TWSs, but also provide a rich material base for exploring many exotic physical phenomena (e.g. chiral magnetic effects, negative magnetoresistance, and quantum anomalous Hall effect) and novel

[1]  C. Felser,et al.  Erratum: Weyl semimetal phase in the non-centrosymmetric compound TaAs , 2015, Nature Physics.

[2]  Su-Yang Xu,et al.  A Weyl Fermion semimetal with surface Fermi arcs in the transition metal monopnictide TaAs class , 2015, Nature Communications.

[3]  E. Bauer,et al.  Magnetotransport of single crystalline NbAs , 2015, Journal of physics. Condensed matter : an Institute of Physics journal.

[4]  Su-Yang Xu,et al.  Observation of the Adler-Bell-Jackiw chiral anomaly in a Weyl semimetal , 2015, 1503.02630.

[5]  X. Dai,et al.  Observation of the Chiral-Anomaly-Induced Negative Magnetoresistance in 3D Weyl Semimetal TaAs , 2015, 1503.01304.

[6]  X. Dai,et al.  Discovery of Weyl semimetal TaAs , 2015 .

[7]  Su-Yang Xu,et al.  Experimental realization of a topological Weyl semimetal phase with Fermi arc surface states in TaAs , 2015 .

[8]  Shuang Jia,et al.  Discovery of a Weyl fermion semimetal and topological Fermi arcs , 2015, Science.

[9]  X. Dai,et al.  Weyl Semimetal Phase in Noncentrosymmetric Transition-Metal Monophosphides , 2014, 1501.00060.

[10]  Z. J. Wang,et al.  A stable three-dimensional topological Dirac semimetal Cd3As2. , 2014, Nature materials.

[11]  A. Vishwanath,et al.  Quantum oscillations from surface Fermi arcs in Weyl and Dirac semimetals , 2014, Nature Communications.

[12]  Z. J. Wang,et al.  Discovery of a Three-Dimensional Topological Dirac Semimetal, Na3Bi , 2013, Science.

[13]  Su-Yang Xu,et al.  Observation of a three-dimensional topological Dirac semimetal phase in high-mobility Cd3As2 , 2013, Nature Communications.

[14]  K. Landsteiner.  Anomalous transport of Weyl fermions in Weyl semimetals , 2013, 1306.4932.

[15]  Xiaoliang Qi,et al.  Recent developments in transport phenomena in Weyl semimetals , 2013, 1309.4464.

[16]  P. Hosur.  Friedel oscillations due to Fermi arcs in Weyl semimetals , 2012, 1208.0027.

[17]  A. Zyuzin,et al.  Topological response in Weyl semimetals and the chiral anomaly , 2012, 1206.1868.

[18]  Chaoxing Liu,et al.  Chiral gauge field and axial anomaly in a Weyl semimetal , 2012, 1204.6551.

[19]  Yulin Chen.  Studies on the electronic structures of three-dimensional topological insulators by angle resolved photoemission spectroscopy , 2012 .

[20]  Yan Sun,et al.  Dirac semimetal and topological phase transitions in A 3 Bi ( A = Na , K, Rb) , 2012, 1202.5636.

[21]  Desheng Kong,et al.  Opportunities in chemistry and materials science for topological insulators and their nanostructures. , 2011, Nature chemistry.

[22]  L. Balents,et al.  Time-reversal invariant realization of the Weyl semimetal phase , 2011, 1109.6137.

[23]  Xi Dai,et al.  Chern semimetal and the quantized anomalous Hall effect in HgCr2Se4. , 2011, Physical review letters.

[24]  Leon Balents,et al.  Weyl semimetal in a topological insulator multilayer. , 2011, Physical review letters.

[25]  Kai-Yu Yang,et al.  Quantum Hall effects in a Weyl semimetal: Possible application in pyrochlore iridates , 2011, 1105.2353.

[26]  L. Balents.  Weyl electrons kiss , 2011 .

[27]  Ashvin Vishwanath,et al.  Subject Areas : Strongly Correlated Materials A Viewpoint on : Topological semimetal and Fermi-arc surface states in the electronic structure of pyrochlore iridates , 2011 .

[28]  X. Qi,et al.  Topological insulators and superconductors , 2010, 1008.2026.

[29]  T. Emge,et al.  Crystal Structure, Electrical Transport, and Magnetic Properties of Niobium Monophosphide. , 1996, Inorganic chemistry.