Journal
ACS NANO
Volume 10, Issue 1, Pages 1378-1385Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b06807
Keywords
Weyl semimetal; topological matter; scanning tunneling microscopy
Categories
Funding
- Gordon Foundation EPiQS Initiative [GBMF4547]
- Betty Moore Foundation EPiQS Initiative [GBMF4547]
- National Research Foundation, Prime Minister's Office, Singapore, under its NRF fellowship [NRF-NRFF2013-03]
- National Basic Research Program of China [2013CB921901, 2014CB239302]
- MOST-Taiwan [102-2119-M-002-004]
- National Science Foundation-MRSEC program through the Princeton Center for Complex Materials [DMR-1420541]
- National Science Council
- Academia Sinica
- National Tsing Hus University, Taiwan
- US Department of Energy (DOE), Office of Science, Basic Energy Sciences [DE-FG02-07ER46352]
- NERSC supercomputing center through DOE [DE-AC02-05CH11231]
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Weyl semimetals may open a new era in condensed matter physics, materials science, and nano technology after graphene and topological insulators. We report the first atomic scale view of the surface states of a Weyl semimetal (NbP) using scanning tunneling microscopy/spectroscopy. We observe coherent quantum interference patterns that arise from the scattering of quasiparticles near point defects on the surface. The measurements reveal the surface electronic structure both below and above the chemical potential in both real and reciprocal spaces. Moreover, the interference maps uncover the scattering processes of NbP's exotic surface states. Through comparison between experimental data and theoretical calculations, we further discover that the orbital and/or spin texture of the surface bands may suppress certain scattering channels on NbP. These results provide a comprehensive understanding of electronic properties on Weyl semimetal surfaces.
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