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Anomalous normal fluid response in a chiral superconductor UTe2
Seokjin Bae1,2, Hyunsoo Kim3,4, Yun Suk Eo3
1Maryland Quantum Materials Center, Department of Physics, University of Maryland, College Park, MD, USA. sjbae@terpmail.umd.edu.
Nature Communications
|May 12, 2021
Summary
Researchers found evidence of a chiral spin-triplet pairing state in UTe2, suggesting a new platform for studying exotic topological excitations and Majorana normal fluid phenomena.
Area of Science:
- Condensed Matter Physics
- Quantum Materials
- Superconductivity
Background:
- Chiral superconductors are theoretical pathways to realizing Majorana normal fluid.
- Experimental evidence for 2D and 3D chiral superconductors remains elusive.
- Understanding novel pairing states is crucial for topological quantum computing.
Purpose of the Study:
- To investigate the pairing state of UTe2 and its potential for hosting Majorana normal fluid.
- To experimentally verify the existence of chiral spin-triplet pairing in UTe2.
- To explore exotic topological excitations in higher dimensions.
Main Methods:
- Microwave surface impedance measurements of UTe2 crystals.
- Conversion of impedance data to complex conductivity.
- Analysis of normal and superfluid responses as a function of temperature.
Main Results:
- Observed anomalous residual normal fluid conductivity in UTe2.
- Superfluid conductivity aligns with predictions for an axial spin-triplet state.
- Evidence for broken time-reversal symmetry, confirming a chiral spin-triplet state.
- Ruled out trivial origins for the observed normal fluid response.
Conclusions:
- UTe2 exhibits a chiral spin-triplet pairing state with a surface normal fluid response.
- This discovery positions UTe2 as a promising material for studying Majorana normal fluid.
- UTe2 offers a new platform for investigating exotic topological excitations.
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