Investigation of particle-hole asymmetry in the cuprates via electronic Raman scattering

Moritz, Brian; Johnston, S.; Devereaux, T. P.; Muschler, B.; Prestel, W.; Hackl, R.; Lambacher, M.; Erb, A.; Komiya, Seiki; Ando, Yoichi

doi:10.1103/physrevb.84.235114

Cited by 15 publications

(22 citation statements)

References 75 publications

(104 reference statements)

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“…Although these numerical techniques cannot access the thermodynamic limit, previous work has demonstrated that they reliably reproduce a number of experimental features, including Zhang-Rice singlets, RIXS excitations, Raman measurements, and ARPES spectra. [74][75][76][77][78][79] These earlier results give us confidence in the numerically exact techniques.…”

Section: Model and Numerical Methodsmentioning

confidence: 75%

Numerical exploration of spontaneous broken symmetries in multiorbital Hubbard models

et al. 2014

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We study three proposals for broken symmetry in the cuprate pseudogap -oxygen antiferromagnetism, ΘII orbital loop currents, and circulating currents involving apex oxygens -through numerical exploration of multi-orbital Hubbard models. Our numerically exact results show no evidence for the existence of oxygen antiferromagnetic order or the ΘII phase in the three-orbital Hubbard model. The model also fails to sustain an ordered current pattern even with the presence of additional apex oxygen orbitals. We thereby conclude that it is difficult to stabilize the aforementioned phases in the multi-orbital Hubbard models for parameters relevant to cuprate superconductors. However, the ΘII phase might be stabilized through explicit flux terms. We find an enhanced propensity for circulating currents with such terms in calculations simulating applied stress or strain, which skew the copper-oxygen plane to resemble a kagome lattice. We propose an experimental viewpoint to shed additional light on this problem.

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Section: Model and Numerical Methodsmentioning

confidence: 75%

Numerical exploration of spontaneous broken symmetries in multiorbital Hubbard models

et al. 2014

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“…x −k 2 y . For addressing subjects such as resonances and the symmetry dependence, only numerical methods are currently available [55][56][57] .…”

Section: Discussionmentioning

confidence: 99%

Magnetic excitations and amplitude fluctuations in insulating cuprates

et al. 2018

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We present results from light scattering experiments on three insulating antiferromagnetic cuprates, YBa$_2$Cu$_3$O$_{6.05}$, Bi$_2$Sr$_2$YCu$_2$O$_{8+\delta}$, and La$_2$CuO$_4$ as a function of polarization and excitation energy. The spectral shape in $B_{1g}$ symmetry is found to be nearly universal and independent of the excitation energy. The spectra agree quantitatively with predictions by field theory [\onlinecite{Weidinger:2015}] facilitating the precise extraction of the Heisenberg coupling $J$. The spectra in the other symmetries are not universal. The variations may be traced back to weak resonance effects and extrinsic contributions. For all three compounds we find support for the existence of chiral excitations appearing as a continuum in $A_{2g}$ symmetry having an onset slightly below $3J$. In La$_2$CuO$_4$ an additional isolated excitation appears on top of the $A_{2g}$ continuum.Comment: 8 pages, 7 figure

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“…Since the only experimental parameter tuned between 1PPE and 2PPE modes of measurement is the intensity, this represents an exceptionally simple method to determine both the occupied and unoccupied band structure of a material. This has exciting implications, for example, for materials such as the high-T c cuprates, where a measurement of both the occupied and unoccupied sides of the energy gap would provide insight on the particle-hole asymmetry of the superconducting and pseudogap states [45,46].…”

Section: Discussionmentioning

confidence: 99%

Ultrafast electron dynamics in the topological insulator Bi 2 Se 3 studied by time-resolved photoemission spectroscopy

Sobota

Yang

Leuenberger

et al. 2014

Journal of Electron Spectroscopy and Related Phenomena

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We characterize the topological insulator Bi2Se3 using time-and angle-resolved photoemission spectroscopy. By employing two-photon photoemission, a complete picture of the unoccupied electronic structure from the Fermi level up to the vacuum level is obtained. We demonstrate that the unoccupied states host a second, Dirac surface state which can be resonantly excited by 1.5 eV photons. We then study the ultrafast relaxation processes following optical excitation. We find that they culminate in a persistent non-equilibrium population of the first Dirac surface state, which is maintained by a meta-stable population of the bulk conduction band. Finally, we perform a temperature-dependent study of the electron-phonon scattering processes in the conduction band, and find the unexpected result that their rates decrease with increasing sample temperature. We develop a model of phonon emission and absorption from a population of electrons, and show that this counter-intuitive trend is the natural consequence of fundamental electron-phonon scattering processes. This analysis serves as an important reminder that the decay rates extracted by time-resolved photoemission are not in general equal to single electron scattering rates, but include contributions from filling and emptying processes from a continuum of states.

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Investigation of particle-hole asymmetry in the cuprates via electronic Raman scattering

Cited by 15 publications

References 75 publications

Numerical exploration of spontaneous broken symmetries in multiorbital Hubbard models

Numerical exploration of spontaneous broken symmetries in multiorbital Hubbard models

Magnetic excitations and amplitude fluctuations in insulating cuprates

Ultrafast electron dynamics in the topological insulator Bi 2 Se 3 studied by time-resolved photoemission spectroscopy

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