Chiral superconductivity in the alternate stacking compound 4Hb-TaS 2

DOI: 10.1126/sciadv.aax9480

Authors: A. Ribak (Technion-Israel Institute of Technology) , R. Majlin Skiff (Tel-Aviv University) , M. Mograbi (Tel-Aviv University) , P. K. Rout (Tel-Aviv University) , M. H. Fischer (University of Zurich) , J. Ruhman (Bar-Ilan University) , K. Chashka (Technion-Israel Institute of Technology) , Y. Dagan (Tel-Aviv University) , A. Kanigel (Technion-Israel Institute of Technology)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Science Advances , VOL 6

State: Published (Approved)
Published: March 2020
Diamond Proposal Number(s): 15822

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-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.

Subject Areas: Materials, Physics


Instruments: I05-ARPES

Other Facilities: Swiss Light Source

Added On: 02/04/2020 15:19

Documents:
eaax9480.full.pdf

Discipline Tags:

Superconductors Quantum Materials Hard condensed matter - electronic properties Physics Materials Science

Technical Tags:

Spectroscopy Angle Resolved Photoemission Spectroscopy (ARPES) High Resolution ARPES (HR-ARPES)