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Scanning-probe Single-electron Capacitance Spectroscopy
Published on: July 30, 2013
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Landau-Level Quantization and Band Splitting of FeSe Monolayers Revealed by Scanning Tunneling Spectroscopy
Wantong Huang1, Haicheng Lin1, Yuguo Yin1
1State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China.
Nano Letters
|November 18, 2024
Summary
Rashba spin-orbit coupling (SOC) influences 2D superconductors. This study reveals Rashba SOC in iron-based superconductors (IBSs) using scanning tunneling spectroscopy, uncovering unique band splitting and Landau quantization.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Mechanics
Background:
- Two-dimensional (2D) superconductors on substrates are affected by Rashba spin-orbit coupling (SOC).
- The impact of Rashba-type SOCs on iron-based superconductors (IBSs) is not well understood.
Purpose of the Study:
- To investigate the presence and effects of Rashba SOC in 2D iron-based superconductors.
- To characterize the band structure modifications induced by Rashba SOC in FeSe monolayers.
Main Methods:
- Utilized scanning tunneling spectroscopy to probe Landau-level spectroscopy.
- Analyzed intricate band splitting in FeSe monolayers.
Main Results:
- Unequivocally demonstrated the presence of Rashba SOC in FeSe monolayers.
- Observed a nonparabolic electron band with unique Landau quantization (E ∝ (nB)^4/3).
- A theoretical model confirmed the dominance of the k^4-term in reshaping the band structure.
Conclusions:
- Rashba SOC plays a critical role in the properties of 2D superconductors.
- This finding opens avenues for exploring new quantum states in low-carrier-concentration systems.
