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Spin-Nernst Effect in Time-Reversal-Invariant Topological Superconductors.
Taiki Matsushita1, Jiei Ando1, Yusuke Masaki2
1Department of Materials Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan.
The spin-Nernst effect in topological superconductors offers clear evidence for helical Cooper pairs. This effect, driven by temperature gradients and impurity scattering, uniquely identifies these exotic superconducting states.
Area of Science:
- Condensed Matter Physics
- Quantum Materials
Background:
- Topological superconductors host exotic quantum states.
- Understanding Cooper pair symmetry is crucial for characterizing superconductors.
Purpose of the Study:
- To investigate the spin-Nernst effect in time-reversal-invariant topological superconductors.
- To demonstrate the spin-Nernst effect as a definitive probe for helical Cooper pairs.
Main Methods:
- Theoretical analysis of quasiparticle scattering at nonmagnetic impurities.
- Investigating the dependence of the spin-Nernst signal on impurity scattering phase shifts.
Main Results:
- The spin-Nernst effect arises from spin-asymmetric scattering of quasiparticles.
- A transverse spin current is generated by a temperature gradient.
- The sign and magnitude of the spin-Nernst effect are sensitive to impurity scattering phase shifts.
Conclusions:
- The spin-Nernst effect provides unambiguous, 'smoking-gun' evidence for helical Cooper pairs.
- This effect is uniquely suited for identifying time-reversal-invariant topological superconducting orders.
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