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Magnetic Field-Induced "Mirage" Gap in an Ising Superconductor
Gaomin Tang1, Christoph Bruder1, Wolfgang Belzig2
1Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland.
Physical Review Letters
|June 25, 2021
Summary
Superconductors resist magnetic fields due to spin-valley locking. This study reveals "mirage" gaps in Ising superconductors, indicating novel pairing correlations resilient to magnetic disruption.
Area of Science:
- Condensed Matter Physics
- Materials Science
Background:
- Superconductivity is typically suppressed by magnetic fields via pair breaking mechanisms.
- Spin-valley locking in 2D materials with spin-orbit interaction offers magnetic resilience.
- Ising superconductors exhibit unique properties due to strong spin-orbit coupling.
Purpose of the Study:
- To investigate the spectral properties of 2D Ising superconductors in a magnetic field, considering disorder.
- To understand the role of spin-orbit coupling and in-plane magnetic fields on superconductivity.
- To identify signatures of novel pairing correlations in these systems.
Main Methods:
- Theoretical investigation of spectral properties.
- Analysis of superconducting states under magnetic fields and disorder.
- Examination of spin-orbit coupling effects.
Main Results:
- Discovered "mirage" gaps, spectral features mirroring the superconducting gap.
- Observed that these mirage gaps emerge at energies comparable to spin-orbit coupling strength.
- Demonstrated that mirage gaps are linked to equal-spin triplet pairing correlations.
Conclusions:
- The Ising superconductor exhibits remarkable resilience to magnetic fields.
- Mirage gaps serve as experimental signatures of finite-energy triplet pairing.
- The odd parity of mirage gaps makes them sensitive to intervalley scattering.
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