Bi2Se3 has been the focus of intense interest over the past decade due to its topological properties. Bi surfaces are known to form on Bi2Se3 upon exposure to atmosphere, but their electronic structure has not been investigated. Here, we report band structure measurements of such Bi surfaces using angle-resolved photoemission spectroscopy. Measured spectra can be well explained by the band structure of a single bilayer of Bi on Bi2Se3, and show that Bi surfaces consistently dominate the photoemission signal for air exposure times of at least 1 hour. These results demonstrate that atmospheric effects should be taken into consideration when identifying two-dimensional transport channels, and when designing surface-sensitive measurements of Bi2Se3, ideally limiting air exposure to no more than a few minutes.
Gauthier, Alexandre, et al. "Band structure of Bi surfaces formed on <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Bi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Se</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math> upon exposure to air." Physical Review Materials, vol. 8, no. 5, May. 2024. https://doi.org/10.1103/physrevmaterials.8.054201
Gauthier, Alexandre, Sobota, Jonathan A., Gauthier, Nicolas, Rotundu, Costel R., Shen, Zhi-Xun, & Kirchmann, Patrick S. (2024). Band structure of Bi surfaces formed on <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Bi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Se</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math> upon exposure to air. Physical Review Materials, 8(5). https://doi.org/10.1103/physrevmaterials.8.054201
Gauthier, Alexandre, Sobota, Jonathan A., Gauthier, Nicolas, et al., "Band structure of Bi surfaces formed on <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Bi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Se</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math> upon exposure to air," Physical Review Materials 8, no. 5 (2024), https://doi.org/10.1103/physrevmaterials.8.054201
@article{osti_2404907,
author = {Gauthier, Alexandre and Sobota, Jonathan A. and Gauthier, Nicolas and Rotundu, Costel R. and Shen, Zhi-Xun and Kirchmann, Patrick S.},
title = {Band structure of Bi surfaces formed on <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Bi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Se</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math> upon exposure to air},
annote = {Bi2Se3 has been the focus of intense interest over the past decade due to its topological properties. Bi surfaces are known to form on Bi2Se3 upon exposure to atmosphere, but their electronic structure has not been investigated. Here, we report band structure measurements of such Bi surfaces using angle-resolved photoemission spectroscopy. Measured spectra can be well explained by the band structure of a single bilayer of Bi on Bi2Se3, and show that Bi surfaces consistently dominate the photoemission signal for air exposure times of at least 1 hour. These results demonstrate that atmospheric effects should be taken into consideration when identifying two-dimensional transport channels, and when designing surface-sensitive measurements of Bi2Se3, ideally limiting air exposure to no more than a few minutes.},
doi = {10.1103/physrevmaterials.8.054201},
url = {https://www.osti.gov/biblio/2404907},
journal = {Physical Review Materials},
issn = {ISSN 2475-9953},
number = {5},
volume = {8},
place = {United States},
publisher = {American Physical Society (APS)},
year = {2024},
month = {05}}