超导电性
堆积
莫特绝缘子
凝聚态物理
范德瓦尔斯力
电荷密度波
无缝回放
物理
量子力学
核磁共振
分子
作者
Amit Ribak,R. Majlin Skiff,M. Mograbi,P. K. Rout,Mark H. Fischer,Jonathan Ruhman,K. B. Chashka,Y. Dagan,Amit Kanigel
出处
期刊:Science Advances
[American Association for the Advancement of Science (AAAS)]
日期:2020-03-27
卷期号:6 (13)
被引量:54
标识
DOI:10.1126/sciadv.aax9480
摘要
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.
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