Dynamics of correlation-frozen antinodal quasiparticles in superconducting cuprates

Cilento, Federico; Manzoni, Giulia; Sterzi, Andrea; Peli, Simone; Ronchi, Andrea; Crepaldi, Alberto; Boschini, Fabio; Cacho, Céphise; Chapman, Richard T.; Springate, E.; Eisaki, H.; Greven, M.; Berciu, Mona; Kemper, A. F.; Damascelli, A.; Capone, Massimo; Giannetti, Claudio; Parmigiani, F.

doi:10.1126/sciadv.aar1998

Cited by 32 publications

(32 citation statements)

References 43 publications

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“…The experimental renormalization of the nonbonding oxy-gen p band has been recently reported in a time-resolved ARPES study of optimally doped Y-Bi2212 single crystals, see Ref. 11. As we are comparing a doped system in the experiment with a half-filled system in theory, a comparison close to the chemical potential is not possible.…”

Section: B Spectral Function and Occupationmentioning

confidence: 99%

Multiband nonequilibriumGW+EDMFTformalism for correlated insulators

2019

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We study the dynamics of charge-transfer insulators after a photoexcitation using the three-band Emery model which is relevant for the description of cuprate superconductors. We provide a detailed derivation of the nonequilibrium extension of the multiband GW +EDMFT formalism and the corresponding downfolding procedure. The Peierls construction of the electron-light coupling is generalized to the multiband case resulting in a gauge invariant combination of the Peierls intraband acceleration and dipolar interband transitions. We use the formalism to study momentum-dependent (inverse) photo-emission spectra and optical conductivities. The time-resolved spectral function shows a strong renormalization of the charge-transfer gap and a substantial broadening of some of the bands. While the upper Hubbard bands exhibits a momentum-dependent broadening, an almost rigid band shift is observed for the ligand bands. The inverse photo-emission spectrum reveals that the inclusion of nonlocal and interband charge fluctuations results in a very fast relaxation of the holes to the top of the Zhang-Rice singlet band. Consistent with the changes in the spectral function, the optical conductivity shows a renormalization of the charge-transfer gap, which is proportional to the photo-doping. The details of the photo-induced changes strongly depend on the dipolar matrix elements, which calls for an ab-initio determination of these parameters.

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Section: B Spectral Function and Occupationmentioning

confidence: 99%

Multiband nonequilibriumGW+EDMFTformalism for correlated insulators

2019

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“…On the one hand, TR-ARPES performed with 6 eV sources have enabled detailed study of lowenergy many-body phenomena; while this has given a new perspective on superconducting gap dynamics of cuprate superconductors (29)(30)(31), electron-phonon interaction in bulk FeSe (32), and surface-state dynamics in topological materials (26,33), low photon energies have limited these studies to a small region of the Brillouin Zone (BZ). On the other hand, ARPES systems using high-harmonic sources have extended the accessible momenta beyond the first BZ, but heretofore have focused on the high-energy scale electron dynamics on the order of 10 fs (25,27,34,35), as system energy resolutions have yet to reach the standards achieved by their 6 eV counterpart.…”

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Direct determination of mode-projected electron-phonon coupling in the time domain

Mills

Boschini

et al. 2019

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Ultrafast spectroscopies have become an important tool for elucidating the microscopic description and dynamical properties of quantum materials. In particular, by tracking the dynamics of non-thermal electrons, a material's dominant scattering processes -and thus the many-body interactions between electrons and collective excitations -can be revealed. Here we present a new method for extracting the electron-phonon coupling strength in the time domain, by means of time and angle-resolved photoemission spectroscopy (TR-ARPES). This method is demonstrated in graphite, where we investigate the 1 arXiv:1902.05572v3 [cond-mat.str-el] 1 Aug 2019 dynamics of photo-injected electrons at the K point, detecting quantized energyloss processes that correspond to the emission of strongly-coupled optical phonons.We show that the observed characteristic timescale for spectral-weight-transfer mediated by phonon-scattering processes allows for the direct quantitative extraction of electron-phonon matrix elements, for specific modes, and with unprecedented sensitivity.The concept of the electronic quasiparticle as proposed by Landau, i.e. the dressing of an electron with many-body and collective excitations (1), is essential to the modern understanding of condensed matter physics. Among the plethora of interactions relevant to solid-state systems, electron-phonon coupling (EPC) has been a persistent subject of great interest, related as it is to the emergence of disparate physical phenomena, from resistivity in normal metals to conventional (BCS) superconductivity and charge-ordered phases (2,3). While strong EPC is desirable in systems like BCS superconductors (4, 5), it is deleterious for conductivity in normal metals, curtailing the application of several compounds as room-temperature electronic devices (6).Given the important role of the electron-phonon interaction in relation to both conventional and quantum materials, extensive theoretical and experimental efforts have been devoted towards determining the strength and anisotropy of EPC. While ab-initio calculations are powerful, they rely on complex approximations which require precise experimental data to benchmark their validity (7). Inelastic scattering experiments -such as Raman spectroscopy (8), electron energy loss spectroscopy (9), inelastic x-ray (10), and neutron scattering (11) -are able to access EPC for specific phonon modes, yet integrated over all electronic states. Angle-resolved photoemission spectroscopy (ARPES), on the converse, can access the strength of EPC via phononmediated renormalization effects for specific momentum-resolved electronic states, as revealed by "kinks" in the electronic band dispersion (12-16). However, extraction of EPC strength from these kinks requires accurate modelling of the bare band dispersion and of the electronic

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“…While in equilibrium the correlation effects in the full ligand bands are weak, photodoping induces charge carriers and nontrivial correlations. In fact, pump-probe studies on cuprate superconductors have detected photoinduced band shifts and modifications in effective masses [39][40][41][42][43][44], as well as a redistribution of spectral weight between different characteristic energy scales [45,46].…”

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confidence: 99%

“…3). It originates from the static Hartree-Fock attraction and is determined by the change in the local orbital occupancy [44,60,61]. The contribution of this effect to the shrinking gap is indicated in Fig.…”

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confidence: 99%

Dynamics of photodoped charge transfer insulators

et al. 2019

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We study the dynamics of charge transfer insulators after photoexcitation using the three-band Emery model and a nonequilibrium extension of Hartree-Fock + EDMFT (extended dynamical mean field theory) and GW + EDMFT. While the equilibrium properties are accurately reproduced by the Hartree-Fock treatment of the ligand bands, dynamical correlations are essential for a proper description of the photodoped state. Photodoping leads to a renormalization of the charge transfer gap and to a substantial broadening of the bands. We calculate the time-resolved photoemission spectrum and optical conductivity and find qualitative agreement with experiments. Our formalism enables the realistic description of nonequilibrium phenomena in materials with ligand bands. It provides a tool to explore the optical manipulation of interaction and correlation effects, including insulator-metal and magnetic transitions.

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Dynamics of correlation-frozen antinodal quasiparticles in superconducting cuprates

Abstract: A novel ultrafast photoemission technique unveils the Mottness of antinodal quasiparticles in superconducting copper oxides.

Cited by 32 publications

References 43 publications

Multiband nonequilibriumGW+EDMFTformalism for correlated insulators

Multiband nonequilibriumGW+EDMFTformalism for correlated insulators

Direct determination of mode-projected electron-phonon coupling in the time domain

Dynamics of photodoped charge transfer insulators

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