Chiral superconductivity in the alternate stacking compound 4Hb-TaS 2
| Autor: | M. Mograbi, Jonathan Ruhman, R. Majlin Skiff, Amit Kanigel, Yoram Dagan, Amit Ribak, Mark H. Fischer, P. K. Rout, K. B. Chashka |
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| Rok vydání: | 2020 |
| Předmět: |
Superconductivity
Physics Multidisciplinary Condensed matter physics Mott insulator Stacking 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences symbols.namesake Gapless playback 0103 physical sciences symbols Symmetry breaking van der Waals force 010306 general physics 0210 nano-technology Ground state Charge density wave |
| Zdroj: | Science Advances. 6 |
| ISSN: | 2375-2548 |
| Popis: | Van der Waals materials offer unprecedented control of electronic properties via stacking of different types of two-dimensional materials. A fascinating frontier, largely unexplored, is the stacking of strongly correlated phases of matter. We study 4Hb-TaS2, which naturally realizes an alternating stacking of 1T-TaS2 and 1H-TaS2 structures. The former is a well-known Mott insulator, which has recently been proposed to host a gapless spin-liquid ground state. The latter is a superconductor known to also host a competing charge density wave state. This raises the question of how these two components affect each other when stacked together. We find a superconductor with a Tc of 2.7 Kelvin and anomalous properties, of which the most notable one is a signature of time-reversal symmetry breaking, abruptly appearing at the superconducting transition. This observation is consistent with a chiral superconducting state. |
| Databáze: | OpenAIRE |
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