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Updated: Aug 6, 2025
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
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Monolayer Superconductivity and Tunable Topological Electronic Structure at the Fe(Te,Se)/Bi2 Te3 Interface
Robert G Moore1, Qiangsheng Lu1, Hoyeon Jeon2
1Materials Sciences and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.
Advanced Materials (Deerfield Beach, Fla.)
|March 15, 2023
Summary
This study demonstrates a tunable platform for Majorana-bound states (MBS) using monolayer Fe(Te,Se) on Bi2Te3. Reduced doping improves spin-momentum locking, crucial for quantum computing applications.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Computing
Background:
- Majorana-bound states (MBS) are key for quantum computing.
- Previous studies in bulk FeTe0.55Se0.45 showed unclear MBS signatures due to inhomogeneity.
- Achieving spin-momentum-locked topological interface states (TIS) is essential for realizing MBS.
Purpose of the Study:
- To investigate superconductivity in monolayer FeTe1-ySe y (Fe(Te,Se)) grown on Bi2Te3.
- To characterize the interfacial electronic and spin structure of Fe(Te,Se)/Bi2Te3 heterostructures.
- To determine the effect of doping on spin-momentum locking and MBS potential.
Main Methods:
- Molecular beam epitaxy (MBE) for growing Fe(Te,Se)/Bi2Te3 heterostructures.
- Spin and angle-resolved photoemission spectroscopy (SARPES) to analyze interfacial spin and electronic structure.
- Scanning tunneling microscopy (STM) to assess material inhomogeneity.
Main Results:
- Superconductivity was achieved in monolayer Fe(Te,Se) on Bi2Te3.
- For y=0.25, Fe(Te,Se) electronic structure overlapped with Bi2Te3 TIS, lacking spin-momentum locking.
- For y=0.1, reduced inhomogeneity and clear spin-momentum locking in topological states were observed.
Conclusions:
- The Fe(Te,Se)/Bi2Te3 system is a tunable platform for realizing MBS.
- Reduced doping in Fe(Te,Se) enhances characteristics vital for Majorana interrogation.
- This work paves the way for improved quantum computing applications.
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