Electronic properties of topological materials studied by angle-resolved photoemission spectroscopy
ORAL
Abstract
We use ultrahigh resolution, tunable, vacuum ultraviolet laser-based angle-resolved photoemission spectroscopy (ARPES) to study the electronic properties of topological materials. In PtSn${}_{4}$, we have discovered Dirac node arc states where Dirac dispersions extend along arcs in the momentum space. In topological semimetal LaBi, we have observed Dirac surface states that are buried deeply in the bulk states with asymmetric mass acquisition. In type-II Weyl semimetal candidate WTe${}_{2}$, we have observed the Fermi arc surface states which are very sensitive to pressure/strain. These results are experimental confirmations of theoretical predictions and band structure calculations.
*Research was supported by the US DOE, Office of Basic Energy Sciences under Contract No. DE-AC02-07CH11358; Gordon and Betty Moore Foundation EPiQS Initiative (Grant No. GBMF4411); CEM, a NSF MRSEC, under Grant No. DMR-1420451.
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