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Electronic reconstruction forming a C2-symmetric Dirac semimetal in Ca3Ru2O7

DOI: 10.1038/s41535-021-00328-3 DOI Help

Authors: M. Horio (Universität Zürich) , Q. Wang (Universität Zürich) , V. Granata (CNR-SPIN; Università di Salerno) , K. P. Kramer (University of Zurich) , Y. Sassa (Chalmers University of Technology) , S. Jöhr (Universität Zürich) , D. Sutter (Universität Zürich) , A. Bold (Universität Zürich) , L. Das (Universität Zürich) , Y. Xu (Universität Zürich) , R. Frison (Swiss Federal Laboratories for Materials Science and Technology (Empa)) , R. Fittipaldi (Università di Salerno) , T. K. Kim (Diamond Light Source) , C. Cacho (Diamond Light Source) , J. E. Rault (Synchrotron SOLEIL) , P. Le Fèvre (Synchrotron SOLEIL) , F. Bertran (Synchrotron SOLEIL) , N. C. Plumb (Swiss Light Source) , M. Shi (Swiss Light Source) , A. Vecchione (CNR-SPIN; Università di Salerno) , M. H. Fischer (Universität Zürich) , J. Chang (Universität Zürich)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Npj Quantum Materials , VOL 6

State: Published (Approved)
Published: March 2021
Diamond Proposal Number(s): 20259

Open Access Open Access

Abstract: Electronic band structures in solids stem from a periodic potential reflecting the structure of either the crystal lattice or electronic order. In the stoichiometric ruthenate Ca3Ru2O7, numerous Fermi surface-sensitive probes indicate a low-temperature electronic reconstruction. Yet, the causality and the reconstructed band structure remain unsolved. Here, we show by angle-resolved photoemission spectroscopy, how in Ca3Ru2O7 a C2-symmetric massive Dirac semimetal is realized through a Brillouin-zone preserving electronic reconstruction. This Dirac semimetal emerges in a two-stage transition upon cooling. The Dirac point and band velocities are consistent with constraints set by quantum oscillation, thermodynamic, and transport experiments, suggesting that the complete Fermi surface is resolved. The reconstructed structure—incompatible with translational-symmetry-breaking density waves—serves as an important test for band structure calculations of correlated electron systems.

Journal Keywords: Condensed-matter physics; Electronic properties and materials

Subject Areas: Materials, Physics

Instruments: I05-ARPES

Other Facilities: SIS at Swiss Light Source; CASSIOPEE at SOLEIL


Discipline Tags:

Material Sciences Physics Quantum Materials Soft condensed matter physics

Technical Tags:

Angle Resolved Photoemission Spectroscopy (ARPES) Spectroscopy