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Chiral superconductivity in the alternate stacking compound 4Hb-TaS2


Ribak, A; Majlin Skiff, R; Mograbi, M; Rout, P K; Fischer, M H; Ruhman, J; Chashka, K; Dagan, Y; Kanigel, A (2020). Chiral superconductivity in the alternate stacking compound 4Hb-TaS2. Science Advances, 6(13):eaax9480.

Abstract

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-TaS<jats:sub>2</jats:sub>, which naturally realizes an alternating stacking of 1T-TaS<jats:sub>2</jats:sub> and 1H-TaS<jats:sub>2</jats:sub> 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 <jats:italic>T</jats:italic><jats:sub>c</jats:sub> 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.

Abstract

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-TaS<jats:sub>2</jats:sub>, which naturally realizes an alternating stacking of 1T-TaS<jats:sub>2</jats:sub> and 1H-TaS<jats:sub>2</jats:sub> 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 <jats:italic>T</jats:italic><jats:sub>c</jats:sub> 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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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Scopus Subject Areas:Health Sciences > Multidisciplinary
Language:English
Date:1 March 2020
Deposited On:12 May 2020 06:22
Last Modified:21 May 2020 11:49
Publisher:American Association for the Advancement of Science
ISSN:2375-2548
OA Status:Gold
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1126/sciadv.aax9480
Related URLs:https://www.zora.uzh.ch/id/eprint/179182/
https://arxiv.org/abs/1905.02225

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