Electronic reconstruction forming a C-2-symmetric Dirac semimetal in Ca3Ru2O7
Artikel i vetenskaplig tidskrift, 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.
Författare
M. Horio
Universität Zürich
Q. Wang
Universität Zürich
V Granata
Universita degli Studi di Salerno
Consiglio Nazionale delle Ricerche (CNR)
K. P. Kramer
Universität Zürich
Yasmine Sassa
Chalmers, Fysik, Materialfysik
S. Johr
Universität Zürich
D. Sutter
Universität Zürich
A. Bold
Universität Zürich
L. Das
Universität Zürich
Y. Xu
Universität Zürich
R. Frison
Eidgenössische Materialprüfungs- und Forschungsanstalt (Empa)
R. Fittipaldi
Consiglio Nazionale delle Ricerche (CNR)
Universita degli Studi di 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
Universita degli Studi di Salerno
Consiglio Nazionale delle Ricerche (CNR)
M. H. Fischer
Universität Zürich
J. Chang
Universität Zürich
npj Quantum Materials
23974648 (eISSN)
Vol. 6 1 29Framtidens Lågdimensionella Skyrmion Material
Vetenskapsrådet (VR) (2017-05078), 2019-06-01 -- 2021-12-31.
Ämneskategorier
Oorganisk kemi
Annan fysik
Den kondenserade materiens fysik
Styrkeområden
Materialvetenskap
DOI
10.1038/s41535-021-00328-3