Anomalous doping evolution of nodal dispersion revealed by in situ ARPES on continuously doped cuprates
Abstract
We study the systematic doping evolution of nodal dispersions by in situ angle-resolved photoemission spectroscopy on the continuously doped surface of a high-temperature superconductor Bi2Sr2CaCu2O8 +x and reveal that the nodal dispersion has three fundamentally different segments separated by two kinks, located at ∼10 meV and roughly 70 meV, respectively. These three segments have different band velocities and different doping dependence. In particular, in the underdoped region the velocity of the high-energy segment increases monotonically as the doping level decreases and can even surpass the bare band velocity. We propose that electron fractionalization is a possible cause for this anomalous nodal dispersion and may even play a key role in the understanding of exotic properties of cuprates.
- Publication:
-
Physical Review B
- Pub Date:
- November 2019
- DOI:
- 10.1103/PhysRevB.100.184504
- arXiv:
- arXiv:1905.04863
- Bibcode:
- 2019PhRvB.100r4504Z
- Keywords:
-
- Condensed Matter - Superconductivity;
- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- Phys. Rev. B 100, 184504 (2019)