2020
DOI: 10.1038/s41535-020-0208-6
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Emergence of pseudogap from short-range spin-correlations in electron-doped cuprates

Abstract: Electron interactions are pivotal for defining the electronic structure of quantum materials. In particular, the strong electron Coulomb repulsion is considered the keystone for describing the emergence of exotic and/or ordered phases of quantum matter as disparate as high-temperature superconductivity and charge-or magnetic-order. However, a comprehensive understanding of fundamental electronic properties of quantum materials is often complicated by the appearance of an enigmatic partial suppression of low-en… Show more

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Cited by 19 publications
(13 citation statements)
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“…For both compounds, we observe a clear suppression of CSW close to the Fermi energy (E F ), as the temperature increases from 30 to 90 K. As an alternative approach to standard Tdependent ARPES, in this work we employ TR-ARPES to meticulously track the temperature-dependent modifications of the low-energy nodal spectral features by tuning the transient electronic temperature T e via optical pumping. Due to the strong electron interactions underlying the cuprates, quasiparticles excited via near-infrared light thermalize on an ultrashort timescale (i.e., ∼100 fs; note that a similar timescale was reported also for the photodoping effects [22]), entering a state of quasiequilibrium where an effective electronic temperature can be defined at each pumpprobe delay [13,23,24]. This method allows one to directly link the transient electronic temperature to the progression of the ARPES spectral features, effectively performing a T -dependent measurement with minimal repercussions from surface degradation and sample drifting.…”
Section: Experimental Strategymentioning
confidence: 62%
“…For both compounds, we observe a clear suppression of CSW close to the Fermi energy (E F ), as the temperature increases from 30 to 90 K. As an alternative approach to standard Tdependent ARPES, in this work we employ TR-ARPES to meticulously track the temperature-dependent modifications of the low-energy nodal spectral features by tuning the transient electronic temperature T e via optical pumping. Due to the strong electron interactions underlying the cuprates, quasiparticles excited via near-infrared light thermalize on an ultrashort timescale (i.e., ∼100 fs; note that a similar timescale was reported also for the photodoping effects [22]), entering a state of quasiequilibrium where an effective electronic temperature can be defined at each pumpprobe delay [13,23,24]. This method allows one to directly link the transient electronic temperature to the progression of the ARPES spectral features, effectively performing a T -dependent measurement with minimal repercussions from surface degradation and sample drifting.…”
Section: Experimental Strategymentioning
confidence: 62%
“…To date, only two TR-ARPES studies have directly tracked the transient evolution of the pseudogap. This was done at the antiferromagnetic hot spot for the electron-doped cuprate Nd 2-x Ce x CuO 4 [25], and at the antinode in the holedoped bilayer material Bi2212 [43]. In the latter case, the appearance of antinodal in-gap states [see Fig.…”
Section: Tr-arpes On Cuprates: a Historical Overviewmentioning
confidence: 99%
“…Cuprates are a prototypical example of a strongly correlated system: their phase diagram hosts a multitude of quantum phases whose origin and interplay are still under debate, such as (but not limited to) unconventional superconductivity, Mott insulating behavior, pseudogap phenomenon, charge order, and band-structure renormalization due to electron-boson coupling (the so called kink ) [20][21][22][23][24]. Here we offer a brief overview of the TR-ARPES research on cuprates over the past 15 years, as well as a comprehensive discussion of the transient evolution of the lowenergy one-electron removal spectral function in Bi-based cuprates based on some of our recent works [19,25,26], and new experimental data.…”
Section: Introductionmentioning
confidence: 99%
“…While the technique is by now fairly wellestablished, interpretation and analysis of TR-ARPES has yet to take advantage of the vast amount of information encoded in the experimental signal. Presently, it is conventional to emphasize the temporal evolution of the electronic temperature [4,[9][10][11][12] or the photoemission intensity in well-defined momentum-energy regions [13][14][15][16].…”
Section: Introductionmentioning
confidence: 99%