DQMP Seminar - Energy Scale of Charge Density Wave in Cuprates

26.11.2019 13:00 – 14:00


The cuprate high temperature superconductors develop spontaneous charge density wave (CDW) order below a temperature TCDW and over a wide range of hole doping p. An outstanding challenge in the field is to understand whether this modulated phase is related to the more exhaustively studied pseudogap and superconducting phases [1,2]. To address this issue, it is important to extract the energy scale ΔCDW associated with the CDW order, and to compare it with the pseudogap (PG) ΔPG and with the superconducting gap ΔSC. However, while TCDW is well-characterized from earlier work, little is known about ΔCDW until now. Here, we report the extraction of ΔCDW for several cuprates using electronic Raman spectroscopy. Crucially, we find that upon approaching the parent Mott state by lowering p, ΔCDW increases in a manner similar to the doping dependence of ΔPG and ΔCDW [3]. This reveals that the above three phases have a common microscopic origin. In addition, we find that ΔCDW ≈ ΔSC over a substantial doping range, which suggests that CDW and superconducting phases are intimately related, for example they may be intertwined, composite orders or fractionalized pair density wave [1,4,5]


[1] E. Fradkin et al., Rev. Mod. Phys. 87, 457 (2015).
[2] B. Keimer et al., Nature 518, 179 (2015).
[3] B. Loret et al., Nature Physics 15, 771, (2019)
[4] Y. Wang et al., Phys. Rev. Lett. 114, 197001 (2015).
[5] D. Chakraborty et al. arXiv:1906.01633.

Lieu

Bâtiment: Ecole de Physique

Auditoire Stückelberg

Organisé par

Département de physique de la matière quantique

Intervenants

Alain Sacuto , Professeur, Laboratoire Matériaux et Phénomènes Quantiques (UMR 7162 CNRS)

entrée libre

Classement

Catégorie: Séminaire