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 29Realization 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