期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 113, 期 45, 页码 12661-12666出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1614247113
关键词
CuO2 pseudogap; commensurate charge density modulation; phase discommensuration
资金
- US Department of Energy, Office of Basic Energy Sciences, Division of Materials Science and Engineering [DE-SC0010313]
- Engineering and Physical Sciences Research Council [EP/G03673X/1, EP/1031014/1]
- Moore Foundation's Emergent Phenomena in Quantum Systems Initiative Grant [GBMF4544]
- Ministry of Science and Education (Japan)
- Global Centers of Excellence Program
- Tyndall National Institute, University College Cork
- Center for Emergent Superconductivity, an Energy Frontier Research Center
- US Department of Energy [DE-2009-BNL-PM015]
- [392182]
- EPSRC [EP/I031014/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [1265368, EP/I031014/1] Funding Source: researchfish
Theories based upon strong real space (r-space) electron-electron interactions have long predicted that unidirectional charge density modulations (CDMs) with four-unit-cell (4a(0)) periodicity should occur in the hole-doped cuprate Mott insulator (MI). Experimentally, however, increasing the hole density p is reported to cause the conventionally defined wavevector Q(A) of 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 vertical bar Q(0)vertical bar= 2 pi/4a(0) throughout the underdoped phase diagram of the canonical cuprate Bi2Sr2CaCu2O8. These observations have significant fundamental consequences because they are orthogonal to a k-space (Fermi-surface)-based picture of the cuprate CDMs but are consistent with strong-coupling r-space-based theories. Our findings imply that it is the latter that provides the intrinsic organizational principle for the cuprate CDM state.
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