Topological surface states and Dirac point tuning in ternary topological insulators

By M. Neupane, S.-Y. Xu, L. Wray, A. Petersen, R. Shankar, N. Alidoust, Chang Liu, A. Fedorov, H. Ji, J. M. Allred and 7 more. 2012

153 citations recorded by the source corpus.

Using angle-resolved photoemission spectroscopy, we report electronic structure for representative members of ternary topological insulators. We show that several members of this family, such as Bi2Se2Te, Bi2Te2Se, and GeBi2Te4, exhibit a singly degenerate Dirac-like surface state, while Bi2Se2S is a fully gapped insulator with no measurable surface state. One of these compounds, Bi2Se2Te, shows tunable surface state dispersion upon its electronic alloying with Sb (SbxBi2−xSe2Te series). Other members of the ternary family such as GeBi2Te4 and BiTe1.5S1.5 show an in-gap surface Dirac point, the former of which has been predicted to show nonzero weak topological invariants such as (1;111); thus belonging to a different topological class than BiTe1.5S1.5. The measured band structure presented here will be a valuable guide for interpreting transport, thermoelectric, and thermopower measurements on these compounds. The unique surface band topology observed in these compounds contributes towards identifying designer materials with desired flexibility needed for thermoelectric and spintronic device fabrication. PACS numbers:

Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/62a77a70f7d455ef4ab624d68568fcbf4f48938d

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Atomic and Molecular Physics, and Optics

1. Tanmoy Das
2. Hsin Lin
3. Arun Bansil

In Condensed Matter Physics

1. Hsin Lin
2. Tanmoy Das
3. Arun Bansil

In Materials Chemistry

1. Tanmoy Das
2. Hsin Lin
3. Arun Bansil

Citations in the corpus

• Colloquium : Topological band theory (2016, background): “Many of these compounds have been synthesized and ARPES (Xu et al. 2010; Neupane et al. 2012; Zhang, Chang, Zhang, et al. 2011; Eremeev, Landolt, et al. 2012; Okamoto et al. 2012) and transport measurements (Xiong et al. 2012; Taskin et al. 2011; Ren et al. 2010) are available.”