期刊
NEW JOURNAL OF PHYSICS
卷 18, 期 -, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/18/10/105003
关键词
topological semimetals; scanning tunneling spectroscopy; quasiparticle interference; Landau level spectroscopy
资金
- Army Research Office-Multidisciplinary University Research Initiative (ARO-MURI) [W911NF-12-1-0461]
- Gordon and Betty Moore Foundation as part of the Emergent Phenomena in Quantum Systems (EPiQS) initiative [GBMF4530]
- NSF Materials Resarch Science and Engineering Centers (MRSEC) through the Princeton Center for Complex Materials [DMR-1420541, NSF-DMR-1104612, NSF-DMR-0819860]
- NSF CAREER [DMR-0952428]
- DOE [DE-FG-02-05ER46200]
- Packard Foundation
- Keck Foundation
- US Department of Energy-Basic Energy Sciences (DOE-BES) [ARO-W911NF-11-1-0379, ARO-W911NF-1-0262, ONR-N00014-14-1-0330, ONR-N00014-13-10661, ONR-N00014-11-10635]
- Defense Advanced Research Projects Agency-US Space and Naval Warfare Systems Command (DARPA-SPWAR) [N6601-11-1-4110]
- LPS
- Eric
- Wendy Schmidt Transformative Technology Fund at Princeton
- DOE-BES [DE-SC0011978]
- Department of Energy [DE-SC0016239]
- NSF EAGER [NOA-AWD1004957]
- Simons Investigator Award
- Schmidt Fund for Innovative Research
- [ARO-W911NF-1-0606]
- U.S. Department of Energy (DOE) [DE-SC0011978] Funding Source: U.S. Department of Energy (DOE)
Following the intense studies on topological insulators, significant efforts have recently been devoted to the search for gapless topological systems. These materials not only broaden the topological classification of matter but also provide a condensed matter realization of various relativistic particles and phenomena previously discussed mainly in high energy physics. Weyl semimetals host massless, chiral, low-energy excitations in the bulk electronic band structure, whereas a symmetry protected pair of Weyl fermions gives rise to massless Dirac fermions. We employed scanning tunneling microscopy/spectroscopy to explore the behavior of electronic states both on the surface and in the bulk of topological semimetal phases. By mapping the quasiparticle interference (QPI) and emerging Landau levels at high magnetic field in Dirac semimetals Cd3As2 and Na3Bi, we observed extended Dirac-like bulk electronic bands. QPI imaged on Weyl semimetal TaAs demonstrated the predicted momentum dependent delocalization of Fermi arc surface states in the vicinity of the surface-projected Weyl nodes.
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