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Detection of electronic nematicity using scanning tunneling microscopy

Author(s): Neto, Eduardo H da Silva; Aynajian, Pegor; Baumbach, Ryan E; Bauer, Eric D; Mydosh, John; et al

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Abstract: Electronic nematic phases have been proposed to occur in various correlated electron systems and were recently claimed to have been detected in scanning tunneling microscopy (STM) conductance maps of the pseudogap states of the cuprate high-temperature superconductor Bi2Sr2CaCu2O8+delta (Bi-2212). We investigate the influence of anisotropic STM tip structures on such measurements and establish, with a model calculation, the presence of a tunneling interference effect within an STM junction that induces energy-dependent symmetry-breaking features in the conductance maps. We experimentally confirm this phenomenon on different correlated electron systems, including measurements in the pseudogap state of Bi-2212, showing that the apparent nematic behavior of the imaged crystal lattice is likely not due to nematic order but is related to how a realistic STM tip probes the band structure of a material. We further establish that this interference effect can be used as a sensitive probe of changes in the momentum structure of the sample’s quasiparticles as a function of energy. DOI: 10.1103/PhysRevB.87.161117
Publication Date: 15-Apr-2013
Electronic Publication Date: 25-Apr-2013
Citation: Neto, Eduardo H da Silva, Aynajian, Pegor, Baumbach, Ryan E, Bauer, Eric D, Mydosh, John, Ono, Shimpei, Yazdani, Ali. (2013). Detection of electronic nematicity using scanning tunneling microscopy. PHYSICAL REVIEW B, 87 (10.1103/PhysRevB.87.161117
DOI: doi:10.1103/PhysRevB.87.161117
ISSN: 2469-9950
EISSN: 2469-9969
Type of Material: Journal Article
Journal/Proceeding Title: PHYSICAL REVIEW B
Version: Author's manuscript

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