Phonon-induced disorder in dynamics of optically pumped metals from nonlinear electron-phonon coupling

Sous, John; Kloss, B.; Kennes, Dante M.; Reichman, David R.; Millis, Andrew J.

doi:10.1038/s41467-021-26030-3

Cited by 31 publications

(10 citation statements)

References 48 publications

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“…In order to research such a model for a sufficiently large system, full diagonalization is not feasible in general anymore due to the exponential growth of the computational cost in the system size. Instead one might revert to dynamical mean-field theory for correlated electron-boson systems [149,150], tensor-network based methods [151,152], or the more recently developed methods based on neural network quantum states [153,154]. For the model where the IR-active phonon is coupled to the local electronic density introduced in [16] a calculation using a 1D chain to model the electronic system as well as a classical drive of the phonons was performed [152] using the infinite time-evolving block decimation [155] method.…”

Section: Discussion and Outlookmentioning

confidence: 99%

Cavity engineering of Hubbard U via phonon polaritons

Dé¹,

Eckhardt²,

Kennes³

et al. 2022

J. Phys. Mater.

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Pump-probe experiments have suggested the possibility to control electronic correlations by driving infrared-active phonons with resonant midinfrared laser pulses. In this work we study two possible microscopic nonlinear electron-phonon interactions behind these observations, namely coupling of the squared lattice displacement either to the electronic density or to the double occupancy. We investigate whether photon-phonon coupling to quantized light in an optical cavity enables similar control over electronic correlations. We ﬁrst show that inside a dark cavity electronic interactions increase, ruling out the possibility that Tc in superconductors can be enhanced via eﬀectively decreased electron-electron repulsion through nonlinear electron-phonon coupling in a cavity. We further ﬁnd that upon driving the cavity, electronic interactions decrease. Two diﬀerent regimes emerge: (i) a strong coupling regime where the phonons show a delayed response at a time proportional to the inverse coupling strength, and (ii) an ultra-strong coupling regime where the response is immediate when driving the phonon polaritons resonantly. We further identify a distinctive feature in the electronic spectral function when electrons couple to phonon polaritons involving an infrared-active phonon mode, namely the splitting of the shake-oﬀ band into three bands. This could potentially be observed by angle-resolved photoemission spectroscopy.

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Section: Discussion and Outlookmentioning

confidence: 99%

Cavity engineering of Hubbard U via phonon polaritons

Dé¹,

Eckhardt²,

Kennes³

et al. 2022

J. Phys. Mater.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Interestingly, many-body localization can still occur in disorder-free spatially homogeneous quantum manybody models, even when the latter are nonintegrable [24][25][26][27][28][29][30][31][32][33]. This usually occurs when the underlying model hosts a local gauge symmetry, and the initial state is pre-pared in a superposition of an extensive number of gauge superselection sectors.…”

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confidence: 99%

Robust quantum many-body scars in lattice gauge theories

Halimeh¹,

Barbiero²,

Hauke³

et al. 2022

Preprint

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Quantum many-body scarring is a paradigm of weak ergodicity breaking arising due to the presence of special nonthermal many-body eigenstates that possess low entanglement entropy, are equally spaced in energy, and concentrate in certain parts of the Hilbert space. Though scars have been shown to be intimately connected to gauge theories, their stability in such experimentally relevant models is still an open question, and it is generally considered that they exist only under fine-tuned conditions. In this work, we show through Krylov-based time-evolution methods how quantum many-body scars can be made robust in the presence of experimental errors through utilizing terms linear in the gauge-symmetry generator or a simplified pseudogenerator in U(1) and Z2 lattice gauge theories. Our findings are explained by the concept of quantum Zeno dynamics. Our experimentally feasible methods can be readily implemented in existing large-scale ultracold-atom quantum simulators and setups of Rydberg atoms with optical tweezers.

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“…Dynamical mean-field theory 15,16 and related studies [17][18][19] focused on the excitation of the nonequilibrium electronic state for several tens of femtoseconds, but the slow lattice motion was not considered. Exact diagonalization and the densitymatrix renormalization group can provide exact results for small lattice sizes, short times scales, and high phonon frequencies; [20][21][22][23][24] as time proceeds, the growing number of phonon excitations renders simulations impossible, in particular for phonon frequencies in the meV range which are required for an accurate description of most CDW materials. To explain the indirect driving mechanism, as exemplified by the experiment in Ref.…”

mentioning

confidence: 99%

Theoretical description of time-resolved photoemission in charge-density-wave materials out to long times

Petrović¹,

Weber²,

Freericks³

2022

Preprint

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We describe coupled electron-phonon systems semiclassically-Ehrenfest dynamics for the phonons and quantum mechanics for the electrons-using a classical Monte Carlo approach that determines the nonequilibrium response to a large pump field. The semiclassical approach is quite accurate, because the phonons are excited to average energies much higher than the phonon frequency, eliminating the need for a quantum description. The numerical efficiency of this method allows us to perform a self-consistent time evolution out to very long times (tens of picoseconds) enabling us to model pump-probe experiments of a charge density wave (CDW) material. Our system is a half-filled, one-dimensional (1D) Holstein chain that exhibits CDW ordering due to a Peierls transition. The chain is subjected to a time-dependent electromagnetic pump field that excites it out of equilibrium, and then a second probe pulse is applied after a time delay. By evolving the system to long times, we capture the complete process of lattice excitation and subsequent relaxation to a new equilibrium, due to an exchange of energy between the electrons and the lattice, leading to lattice relaxation at finite temperatures. We employ an indirect (impulsive) driving mechanism of the lattice by the pump pulse due to the driving of the electrons by the pump field. We identify two driving regimes, where the pump can either cause small perturbations or completely invert the initial CDW order. Our work successfully describes the ringing of the amplitude mode in CDW systems that has long been seen in experiment, but never successfully explained by microscopic theory.

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Phonon-induced disorder in dynamics of optically pumped metals from nonlinear electron-phonon coupling

Cited by 31 publications

References 48 publications

Cavity engineering of Hubbard U via phonon polaritons

Cavity engineering of Hubbard U via phonon polaritons

Robust quantum many-body scars in lattice gauge theories

Theoretical description of time-resolved photoemission in charge-density-wave materials out to long times

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