paper

Unambiguous connection between the Fermi surface topology and the pseudogap in Bi $_{2}$ Sr $_{2}$ CaCu $_{2}$ O $_{8 + d}$

arXiv:1804.02453 · doi:10.1103/PhysRevB.97.174521

Abstract

We study the behavior of the pseudogap in overdoped Bi $_{2}$ Sr $_{2}$ CaCu $_{2}$ O $_{8 + d}$ by electronic Raman scattering (ERS) and angle-resolved photoemission spectroscopy (ARPES) on the same single crystals. Using both techniques we find that, unlike the superconducting gap, the pseudogap related to the anti-bonding band vanishes above the critical doping p $_{c}$ = 0.22. Concomitantly, we show from ARPES measurements that the Fermi surface of the anti-bonding band is hole-like below pc and becomes electron-like above p $_{c}$ . This reveals that the appearance of the pseudogap depends on the Fermi surface topology in Bi $_{2}$ Sr $_{2}$ CaCu $_{2}$ O $_{8 + d}$ , and more generally, puts strong constraint on theories of the pseudogap phase.

6 pages , 3 figures

Unambiguous connection between the Fermi surface topology and the pseudogap in Bi2​Sr2​CaCu2​O8+d​

Abstract

Unambiguous connection between the Fermi surface topology and the pseudogap in Bi $_{2}$ Sr $_{2}$ CaCu $_{2}$ O $_{8 + d}$