Loop currents in quantum matter

Philippe Bourges; Dalila Bounoua; Yvan Sidis

doi:10.5802/crphys.84

Loop currents in quantum matter

Philippe Bourges ¹ ; Dalila Bounoua ¹ ; Yvan Sidis ¹

¹ Université Paris-Saclay, CNRS, CEA, Laboratoire Léon Brillouin, 91191, Gif-sur-Yvette, France

Comptes Rendus. Physique, Volume 22 (2021) no. S5, pp. 7-31.

Résumé

In many quantum materials, strong electron correlations lead to the emergence of new states of matter. In particular, the study in the last decades of the complex phase diagram of high temperature superconducting cuprates highlighted intra-unit-cell electronic instabilities breaking discrete Ising-like symmetries, while preserving the lattice translation invariance. Polarized neutron diffraction experiments have provided compelling evidences supporting a new form of intra-unit-cell magnetism, emerging concomitantly with the so-called pseudogap state of these materials. This observation is currently interpreted as the magnetic hallmark of an intra-unit-cell loop current order, breaking both parity and time-reversal symmetries. More generally, this magneto-electric state is likely to exist in a wider class of quantum materials beyond superconducting cuprates. For instance, it has been already observed in hole-doped Mott insulating iridates or in the spin liquid state of hole-doped 2-leg ladder cuprates.

Première publication : 2021-09-07
Publié le : 2022-05-11

DOI : 10.5802/crphys.84

Mots clés : Loop-current, Quantum matter, Polarized neutron diffraction, High-temperature superconductors, Pseudo-gap, Magnetic correlations

Affiliations des auteurs :

Philippe Bourges ¹ ; Dalila Bounoua ¹ ; Yvan Sidis ¹

¹ Université Paris-Saclay, CNRS, CEA, Laboratoire Léon Brillouin, 91191, Gif-sur-Yvette, France

Licence :

CC-BY 4.0

Droits d'auteur : Les auteurs conservent leurs droits

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Philippe Bourges; Dalila Bounoua; Yvan Sidis. Loop currents in quantum matter. Comptes Rendus. Physique, Volume 22 (2021) no. S5, pp. 7-31. doi : 10.5802/crphys.84. https://comptes-rendus.academie-sciences.fr/physique/articles/10.5802/crphys.84/

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