Proximity-effect-induced Superconducting Gap in Topological Surface States – A Point Contact Spectroscopy Study of NbSe2/Bi2Se3 Superconductor-Topological Insulator Heterostructures
Abstract
Proximity-effect-induced superconductivity was studied in epitaxial topological insulator Bi2Se3 thin films grown on superconducting NbSe2 single crystals. A point contact spectroscopy (PCS) method was used at low temperatures down to 40 mK. An induced superconducting gap in Bi2Se3 was observed in the spectra, which decreased with increasing Bi2Se3 layer thickness, consistent with the proximity effect in the bulk states of Bi2Se3 induced by NbSe2. At very low temperatures, an extra point contact feature which may correspond to a second energy gap appeared in the spectrum. For a 16 quintuple layer Bi2Se3 on NbSe2 sample, the bulk state gap value near the top surface is ~159 μeV, while the second gap value is ~120 μeV at 40 mK. The second gap value decreased with increasing Bi2Se3 layer thickness, but the ratio between the second gap and the bulk state gap remained about the same for different Bi2Se3 thicknesses. It is plausible that this is due to superconductivity in Bi2Se3 topological surface states induced through the bulk states. In conclusion, the two induced gaps in the PCS measurement are consistent with the three-dimensional bulk state and the two-dimensional surface state superconducting gaps observed in the angle-resolved photoemission spectroscopy (ARPES) measurement.
- Authors:
-
[1];
[1];
[1]
- The Pennsylvania State Univ., University Park, PA (United States)
- National Taiwan Univ., Taipei (Taiwan)
- Publication Date:
- Research Org.:
- Pennsylvania State Univ., University Park, PA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1465870
- Grant/Contract Number:
- FG02-08ER46531; SC0005042
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Scientific Reports
- Additional Journal Information:
- Journal Volume: 7; Journal Issue: 1; Journal ID: ISSN 2045-2322
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Dai, Wenqing, Richardella, Anthony, Du, Renzhong, Zhao, Weiwei, Liu, Xin, Liu, C. X., Huang, Song -Hsun, Sankar, Raman, Chou, Fangcheng, Samarth, Nitin, and Li, Qi. Proximity-effect-induced Superconducting Gap in Topological Surface States – A Point Contact Spectroscopy Study of NbSe2/Bi2Se3 Superconductor-Topological Insulator Heterostructures. United States: N. p., 2017.
Web. doi:10.1038/s41598-017-07990-3.
Dai, Wenqing, Richardella, Anthony, Du, Renzhong, Zhao, Weiwei, Liu, Xin, Liu, C. X., Huang, Song -Hsun, Sankar, Raman, Chou, Fangcheng, Samarth, Nitin, & Li, Qi. Proximity-effect-induced Superconducting Gap in Topological Surface States – A Point Contact Spectroscopy Study of NbSe2/Bi2Se3 Superconductor-Topological Insulator Heterostructures. United States. https://doi.org/10.1038/s41598-017-07990-3
Dai, Wenqing, Richardella, Anthony, Du, Renzhong, Zhao, Weiwei, Liu, Xin, Liu, C. X., Huang, Song -Hsun, Sankar, Raman, Chou, Fangcheng, Samarth, Nitin, and Li, Qi. Wed .
"Proximity-effect-induced Superconducting Gap in Topological Surface States – A Point Contact Spectroscopy Study of NbSe2/Bi2Se3 Superconductor-Topological Insulator Heterostructures". United States. https://doi.org/10.1038/s41598-017-07990-3. https://www.osti.gov/servlets/purl/1465870.
@article{osti_1465870,
title = {Proximity-effect-induced Superconducting Gap in Topological Surface States – A Point Contact Spectroscopy Study of NbSe2/Bi2Se3 Superconductor-Topological Insulator Heterostructures},
author = {Dai, Wenqing and Richardella, Anthony and Du, Renzhong and Zhao, Weiwei and Liu, Xin and Liu, C. X. and Huang, Song -Hsun and Sankar, Raman and Chou, Fangcheng and Samarth, Nitin and Li, Qi},
abstractNote = {Proximity-effect-induced superconductivity was studied in epitaxial topological insulator Bi2Se3 thin films grown on superconducting NbSe2 single crystals. A point contact spectroscopy (PCS) method was used at low temperatures down to 40 mK. An induced superconducting gap in Bi2Se3 was observed in the spectra, which decreased with increasing Bi2Se3 layer thickness, consistent with the proximity effect in the bulk states of Bi2Se3 induced by NbSe2. At very low temperatures, an extra point contact feature which may correspond to a second energy gap appeared in the spectrum. For a 16 quintuple layer Bi2Se3 on NbSe2 sample, the bulk state gap value near the top surface is ~159 μeV, while the second gap value is ~120 μeV at 40 mK. The second gap value decreased with increasing Bi2Se3 layer thickness, but the ratio between the second gap and the bulk state gap remained about the same for different Bi2Se3 thicknesses. It is plausible that this is due to superconductivity in Bi2Se3 topological surface states induced through the bulk states. In conclusion, the two induced gaps in the PCS measurement are consistent with the three-dimensional bulk state and the two-dimensional surface state superconducting gaps observed in the angle-resolved photoemission spectroscopy (ARPES) measurement.},
doi = {10.1038/s41598-017-07990-3},
journal = {Scientific Reports},
number = 1,
volume = 7,
place = {United States},
year = {2017},
month = {8}
}
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