Journal
PHYSICAL REVIEW LETTERS
Volume 108, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.116801
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Funding
- JSPS [23224010, 23.4376]
- JST-CREST, MEXT of Japan
- AFOSR [AOARD 10-4103]
- KEK-PF [2010G507]
- Grants-in-Aid for Scientific Research [24654096, 22103004, 11J04376, 23224010] Funding Source: KAKEN
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We have performed angle-resolved photoemission spectroscopy on Pb(Bi1-xSbx)(2)Te-4, which is a member of lead-based ternary tellurides and has been theoretically proposed as a candidate for a new class of three-dimensional topological insulators. In PbBi2Te4, we found a topological surface state with a hexagonally deformed Dirac-cone band dispersion, indicating that this material is a strong topological insulator with a single topological surface state at the Brillouin-zone center. Partial replacement of Bi with Sb causes a marked change in the Dirac carrier concentration, leading to the sign change of Dirac carriers from n type to p type. The Pb(Bi1-xSbx)(2)Te-4 system with tunable Dirac carriers thus provides a new platform for investigating exotic topological phenomena.
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