title: Commensurate 4a0-period charge density modulations throughout the Bi2Sr2CaCu2O8+xpseudogap regime.
abstract: Theories based upon strong real space (r-space) electron-electron interactions have long predicted that unidirectional charge density modulations (CDMs) with four-unit-cell (4a0) periodicity should occur in the hole-doped cuprate Mott insulator (MI). Experimentally, however, increasing the hole densitypis reported to cause the conventionally defined wavevectorQAof the CDM to evolve continuously as if driven primarily by momentum-space (k-space) effects. Here we introduce phase-resolved electronic structure visualization for determination of the cuprate CDM wavevector. Remarkably, this technique reveals a virtually doping-independent locking of the local CDM wavevector at [Formula: see text] throughout the underdoped phase diagram of the canonical cuprate Bi2Sr2CaCu2O8These observations have significant fundamental consequences because they are orthogonal to ak-space (Fermi-surface)-based picture of the cuprate CDMs but are consistent with strong-couplingr-space-based theories. Our findings imply that it is the latter that provides the intrinsic organizational principle for the cuprate CDM state.
authors: Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY 14853.
authors: Andrej
authors: A
authors: Mesaros
authors: Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973.
authors: Kazuhiro
authors: K
authors: Fujita
authors: Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY 14853.|School of Physics and Astronomy, University of St. Andrews, St. Andrews, Fife KY16 9SS, Scotland.
authors: Stephen D
authors: SD
authors: Edkins
authors: Department of Physics, Harvard University, Cambridge, MA 02138.|Department of Physics, University of California, Davis, CA 95616.
authors: Mohammad H
authors: MH
authors: Hamidian
authors: Superconducting Electronics Group, Electronics and Photonics Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan.
authors: Hiroshi
authors: H
authors: Eisaki
authors: Superconducting Electronics Group, Electronics and Photonics Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan.|Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan.
authors: Shin-Ichi
authors: SI
authors: Uchida
authors: Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY 14853; jcseamusdavis@gmail.com eun-ah.kim@cornell.edu.|Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973.|School of Physics and Astronomy, University of St. Andrews, St. Andrews, Fife KY16 9SS, Scotland.|Tyndall National Institute, University College Cork, Cork T12R5C, Ireland.
authors: J C Séamus
authors: JCS
authors: Davis
authors: Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY 14853.|Department of Physics, Binghamton University, Binghamton, NY 13902-6000.
authors: Michael J
authors: MJ
authors: Lawler
authors: Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY 14853; jcseamusdavis@gmail.com eun-ah.kim@cornell.edu.
authors: Eun-Ah
authors: EA
authors: Kim
keywords: CuO2 pseudogap; commensurate charge density modulation; phase discommensuration