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Chiral superconductivity in the alternate stacking compound 4Hb-TaS2
A Ribak1, R Majlin Skiff2, M Mograbi2
1Physics Department, Technion-Israel Institute of Technology, Haifa 32000, Israel.
Science Advances
|April 8, 2020
Summary
Researchers explored stacking correlated materials in 4Hb-TaS2, finding a superconductor exhibiting time-reversal symmetry breaking. This suggests a potential chiral superconducting state in van der Waals heterostructures.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Materials
Background:
- Van der Waals materials enable tunable electronic properties through stacking 2D materials.
- Strongly correlated phases in stacked materials remain largely unexplored.
- 4Hb-TaS2 combines Mott insulating (1T-TaS2) and superconducting (1H-TaS2) layers.
Purpose of the Study:
- Investigate the interplay between Mott insulating and superconducting states in 4Hb-TaS2.
- Characterize the emergent electronic properties of this van der Waals heterostructure.
- Determine if stacking influences the exotic ground states of individual layers.
Main Methods:
- Experimental synthesis and characterization of 4Hb-TaS2 single crystals.
- Low-temperature electrical transport measurements.
- Magnetic susceptibility and other probes to detect symmetry breaking.
Main Results:
- Observed superconductivity with a critical temperature (Tc) of 2.7 Kelvin.
- Detected anomalous properties, including a signature of time-reversal symmetry breaking.
- The symmetry breaking appears abruptly at the superconducting transition.
Conclusions:
- The findings are consistent with a chiral superconducting state in 4Hb-TaS2.
- This study opens new avenues for exploring correlated quantum phenomena in van der Waals heterostructures.
- 4Hb-TaS2 serves as a promising platform for realizing novel quantum states.
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