Electronic reconstruction forming a C-2-symmetric Dirac semimetal in Ca3Ru2O7
Journal article, 2021

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 C-2-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.

Author

M. Horio

University of Zürich

Q. Wang

University of Zürich

V Granata

University of Salerno

National Research Council of Italy (CNR)

K. P. Kramer

University of Zürich

Yasmine Sassa

Chalmers, Physics, Materials Physics

S. Johr

University of Zürich

D. Sutter

University of Zürich

A. Bold

University of Zürich

L. Das

University of Zürich

Y. Xu

University of Zürich

R. Frison

Swiss Federal Laboratories for Materials Science and Technology (Empa)

R. Fittipaldi

National Research Council of Italy (CNR)

University of Salerno

T. K. Kim

Diamond Light Source

C. Cacho

Diamond Light Source

J. E. Rault

SOLEIL Synchrotron

P. Le Fevre

SOLEIL Synchrotron

F. Bertran

SOLEIL Synchrotron

N. C. Plumb

Paul Scherrer Institut

M. Shi

Paul Scherrer Institut

A. Vecchione

University of Salerno

National Research Council of Italy (CNR)

M. H. Fischer

University of Zürich

J. Chang

University of Zürich

npj Quantum Materials

23974648 (eISSN)

Vol. 6 1 29

Realization of Novel Low‐Dimensional Skyrmion Systems

Swedish Research Council (VR) (2017-05078), 2019-06-01 -- 2021-12-31.

Subject Categories

Inorganic Chemistry

Other Physics Topics

Condensed Matter Physics

Areas of Advance

Materials Science

DOI

10.1038/s41535-021-00328-3

More information

Latest update

1/3/2024 9