Chemical-Potential-Dependent Superconducting Spectroscopy on Bi2Te3/NbSe2 Heterostructures

Abstract

High-resolution scanning tunneling spectroscopy performed at dilution refrigerator temperatures was employed to investigate the superconducting properties of topological insulator/superconductor (Bi2Te3/NbSe2) heterostructures. Coherence peaks with inner kinks or inner peaks, deviating from the conventional single s-wave spectral line shape, were observed in both 5 quintuple-layer (5QL) and 7QL Bi2Te3 thin films. Based on the combination of chemical-potential-dependent spectroscopic measurements and model simulations, we conclude that these spectral features arise from contributions of bulk and surface states in Bi2Te3 by selectively proximity-coupled to a single superconducting gap from NbSe2, rather than inheriting the complicated superconductor's order parameter of NbSe2.

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BibTeX RIS

BibTeX

@misc{hu2026chemicalpotentialdependent,
  title = {{Chemical-Potential-Dependent Superconducting Spectroscopy on Bi2Te3/NbSe2 Heterostructures}},
  author = {Pengyu Hu and Chun Yu Wan and Qiaoyan Yu and Chen Qian and Yisheng Gu and Xian Du and Xuhui Ning and Tingwen Miao and Shi Chen and Zihao Ma and Hao Yang and Hemian Yi and Weijiong Chen and Xiaoxue Liu and Liang Liu and Dandan Guan and Yaoyi Li and Shiyong Wang and Canhua Liu and Sangen Zhao and Fulin Wang and Junwei Liu and Hao Zheng and Jinfeng Jia},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.14627},
  eprint = {2610.14627},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.14627},
  note = {CC BY 4.0},
}

RIS

TY  - UNPB
TI  - Chemical-Potential-Dependent Superconducting Spectroscopy on Bi2Te3/NbSe2 Heterostructures
AU  - Pengyu Hu
AU  - Chun Yu Wan
AU  - Qiaoyan Yu
AU  - Chen Qian
AU  - Yisheng Gu
AU  - Xian Du
AU  - Xuhui Ning
AU  - Tingwen Miao
AU  - Shi Chen
AU  - Zihao Ma
AU  - Hao Yang
AU  - Hemian Yi
AU  - Weijiong Chen
AU  - Xiaoxue Liu
AU  - Liang Liu
AU  - Dandan Guan
AU  - Yaoyi Li
AU  - Shiyong Wang
AU  - Canhua Liu
AU  - Sangen Zhao
AU  - Fulin Wang
AU  - Junwei Liu
AU  - Hao Zheng
AU  - Jinfeng Jia
PY  - 2026
DA  - 2026/10/10
PB  - arXiv
DO  - 10.48550/arxiv.2610.14627
UR  - https://arxiv.org/abs/2610.14627
AB  - High-resolution scanning tunneling spectroscopy performed at dilution refrigerator temperatures was employed to investigate the superconducting properties of topological insulator/superconductor (Bi2Te3/NbSe2) heterostructures. Coherence peaks with inner kinks or inner peaks, deviating from the conventional single s-wave spectral line shape, were observed in both 5 quintuple-layer (5QL) and 7QL Bi2Te3 thin films. Based on the combination of chemical-potential-dependent spectroscopic measurements and model simulations, we conclude that these spectral features arise from contributions of bulk and surface states in Bi2Te3 by selectively proximity-coupled to a single superconducting gap from NbSe2, rather than inheriting the complicated superconductor's order parameter of NbSe2.
ER  -

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