Magnon-mediated attraction between two holes doped in a 
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 layer

Möller, Mirko; Adolphs, Clemens P. J.; Berciu, Mona

doi:10.1103/physrevb.100.165118

Cited by 4 publications

(2 citation statements)

References 43 publications

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“…This coupling affects not only the quasiparticle dispersion but also the hole-hole effective interaction mediated through boson exchange. If addition of phonon exchange to the magnon exchange will turn out to boost the hole-hole effective attraction 49 (as is the case in the simpler Holstein-Hubbard model) then hole-lattice coupling could play a significant role in driving high-temperature superconductivity in the cuprates, even if it may not be its primary driver. The calculation of this effective attraction in the presence of both magnons and phonons is a complicated matter, which will be postponed for future work.…”

Section: Discussionmentioning

confidence: 99%

Dressing due to correlations strongly reduces the effect of electron-phonon coupling

Yam,

Sawatzky,

Berciu

2022

Preprint

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We investigate the difference between the coupling of a bare carrier to phonons versus the coupling of a correlations-dressed quasiparticle to phonons, and show that latter may be weak even if the former is strong. Specifically, we analyze the effect of the hole-phonon coupling on the dispersion of the quasiparticle that forms when a single hole is doped into a cuprate layer. To model this, we start from the three-band Emery model supplemented by the Peierls modulation of the p-d and p-p hoppings due to the motion of O ions. We then project onto the strongly correlated U dd → ∞ limit where charge fluctuations are frozen on the Cu site. The resulting effective Hamiltonian describes the motion of a doped hole on the O sublattice, and its interactions with Cu spins and O phonons. We show that even though the hole-phonon coupling is moderate to strong, it leads to only a very minor increase of the quasiparticle's effective mass as compared to its mass in the absence of coupling to phonons, consistent with a weak coupling to phonons of the correlations-dressed quasiparticle. We explain the reasons for this suppression, revealing why it is expected to happen in any systems with strong correlations.

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Section: Discussionmentioning

confidence: 99%

Dressing due to correlations strongly reduces the effect of electron-phonon coupling

Yam,

Sawatzky,

Berciu

2022

Preprint

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“…They can also be excited by external fields [6,[8][9][10][11][12] which leads to coherent propagation of SWs as a dispersive signal. The electron-magnon interaction can provide a glue for Copper pairs in magnon-mediated superconductivity [13][14][15][16]. It can also lead to the formation of composite particles, such as magnetic polaron, via hybridization of electronic and magnonic states [17][18][19][20][21].…”

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confidence: 99%

Magnon-driven chiral charge and spin pumping and electron-magnon scattering from time-dependent quantum transport combined with classical atomistic spin dynamics

2020

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Using newly developed time-dependent-quantum-transport/classical-micromagnetics framework, we investigate interaction between conduction electrons and a single spin wave (SW) coherently excited within a metallic ferromagnetic nanowire. The classical micromagnetics describes SW as a collection of localized magnetic moments whose vectors of fixed length precess with harmonic variation in the phase of precession of adjacent moments around the local magnetization direction. Conversely, electrons interacting with SW are described quantum-mechanically using time-dependent nonequilibrium Green functions. When the nanowire hosting SW is attached to two normal metal (NM) leads, even in the absence of any external dc bias voltage between them the SW pumps chiral electronic charge and spin currents into the leads-they scale linearly with the frequency of the precession and their direction is tied to the direction of wave propagation. This is in contrast to standard pumping of identical spin currents in both directions, and no charge current, by the uniform precession mode. Upon applying dc bias voltage to inject spin-polarized charge current from the left NM lead, electrons interact with SW where we quantify outflowing charge and spin current into the right NM lead due to both scattering off time-dependent potential generated by the SW and superposition with the currents pumped by the SW itself. Finally, we use Lorentzian voltage pulse to excite the so-called "leviton" out of the Fermi sea, which carries two electron charges with no accompanying electron-hole pairs. The scattering of such soliton-like quasiparticle from the SW results in the change of its width and the corresponding charge and spin it carries.

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Dressing due to correlations strongly reduces the effect of electron-phonon coupling

Yam

Sawatzky²,

Berciu³

2022

Phys. Rev. B

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Magnon-mediated attraction between two holes doped in a CuO2 layer

Cited by 4 publications

References 43 publications

Dressing due to correlations strongly reduces the effect of electron-phonon coupling

Dressing due to correlations strongly reduces the effect of electron-phonon coupling

Magnon-driven chiral charge and spin pumping and electron-magnon scattering from time-dependent quantum transport combined with classical atomistic spin dynamics

Dressing due to correlations strongly reduces the effect of electron-phonon coupling

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