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Published September 15, 2013 | Submitted + Published
Journal Article Open

Quasiparticle interference on the surface of the topological crystalline insulator Pb_(1−x)Sn_xSe


Topological crystalline insulators represent a novel topological phase of matter in which the surface states are protected by discrete point group symmetries of the underlying lattice. Rock-salt lead-tin-selenide alloy is one possible realization of this phase, which undergoes a topological phase transition upon changing the lead content. We used scanning tunneling microscopy (STM) and angle resolved photoemission spectroscopy (ARPES) to probe the surface states on (001) Pb_(1−x)Sn_xSe in the topologically nontrivial (x=0.23) and topologically trivial (x=0) phases. We observed quasiparticle interference with STM on the surface of the topological crystalline insulator and demonstrated that the measured interference can be understood from ARPES studies and a simple band structure model. Furthermore, our findings support the fact that Pb_(0.77)Sn_(0.23)Se and PbSe have different topological nature.

Additional Information

© 2013 American Physical Society. Received 31 May 2013; published 9 September 2013. We thank B. Andrei Bernevig and Chen Fang for the discussions. The work at Princeton University was supported by NSF-DMR1104612, NSF-MRSEC programs through the Princeton Center for Complex Materials (DMR-0819860), DARPA-SPAWAR grant N6601-11-1-4110, and ARO MURI program, grant W911NF-12-1-0461. The work at Brookhaven National Lab is supported by US Department of Energy, Office of Basic Energy Sciences, under Contract No. DE-AC02-98CH10886. S. N.-P. acknowledges support of the European Community under a Marie Curie OEF fellowship.

Attached Files

Published - PhysRevB.88.125414.pdf

Submitted - 1306.0043v2.pdf


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