Ultrafast dynamical Lifshitz transition

Beaulieu, Samuel; Dong, Shuo; Tancogne-Dejean, Nicolas; Dendzik, Maciej; Pincelli, Tommaso; Maklar, Julian; Xian, R. Patrick; Sentef, Michael A.; Wolf, Martin; Rubio, Ángel; Rettig, Laurenz; Ernstorfer, Ralph

doi:10.1126/sciadv.abd9275

Cited by 68 publications

(32 citation statements)

References 41 publications

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“…In particular a photo-induced insulator-to-metal transition was observed in in the one-dimensional Mott-insulator ET-F 2 TCNQ [128,141] for which the possibility of controlling electronic interactions through driving of an IR-active phonon with a laser has previously been demonstrated [19,21]. Similarly, effectively reduced correlations by electronic screening through laser-induced electronic excitations have been proposed theoretically [142,143] and reported experimentally [144,145].…”

Section: Discussion and Outlookmentioning

confidence: 89%

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: 89%

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

“…We envision that further improvements on the accuracy and computational efficiency aspects as well as integration into existing laboratory workflows [43] will facilitate scientific discovery. Our expected use cases include (i) online monitoring [44] of band mapping experiments in the study of materials phase transitions [45] or functioning devices [46], where changes in atomic structure or carrier mobility are often accompanied by detectable changes in the electronic structure (including band dispersion), resulting in I(k, E, t) with time (t) dependence in addition to momentum (k) and energy. (ii) A similar scenario occurs in spatial mapping of electronic structure variations for electronic devices via scanning photoemission measurements [47,48], resulting in I(k, E, x) with spatial (x) dependence.…”

Section: Discussionmentioning

confidence: 99%

A machine learning route between band mapping and band structure

Xian

Stimper

Zacharias

et al. 2022

Preprint

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Electronic band structure (BS) and crystal structure are the two complementary identifiers of solid state materials. While convenient instruments and reconstruction algorithms have made large, empirical, crystal structure databases possible, extracting quasiparticle dispersion (closely related to BS) from photoemission band mapping data is currently limited by the available computational methods. To cope with the growing size and scale of photoemission data, we develop a pipeline including probabilistic machine learning and the associated data processing, optimization and evaluation methods for band structure reconstruction, leveraging theoretical calculations. The pipeline reconstructs all 14 valence bands of a semiconductor and shows excellent performance on benchmarks and other materials datasets. The reconstruction uncovers previously inaccessible momentum-space structural information on both global and local scales, while realizing a path towards integration with materials science databases. Our approach illustrates the potential of combining machine learning and domain knowledge for scalable feature extraction in multidimensional data.

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“…Yet this route relies on the presence of molecular orbitals coupled to local structural degrees of freedom and cannot be readily extended to other classes of strongly correlated materials, like transition metal oxides. In these systems, the Hubbard U is a strictly atomic property and its modification requires alternative microscopic mechanisms, such as dynamical electronic screening [21][22][23][24][25] or Floquet-type dressing of the Coulomb repulsion [26]. Achieving dynamical control of the Hubbard U in transition metal oxides would be particularly consequential for steering their multiple quantum phases, notably magnetism, multiferroicity, charge/spin order, and superconductivity [27,28].…”

Section: Introductionmentioning

confidence: 99%

Ultrafast renormalization of the onsite Coulomb repulsion in a cuprate superconductor

Baykusheva,

Jang,

Husain

et al. 2021

Preprint

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Ultrafast lasers are an increasingly important tool to control and stabilize emergent phases in quantum materials. Among a variety of possible excitation protocols, a particularly intriguing route is the direct light-engineering of microscopic electronic parameters, such as the electron hopping and the local Coulomb repulsion (Hubbard U ). In this work, we use time-resolved xray absorption spectroscopy to demonstrate the light-induced renormalization of the Hubbard U in a cuprate superconductor, La1.905Ba0.095CuO4. We show that intense femtosecond laser pulses induce a substantial redshift of the upper Hubbard band, while leaving the Zhang-Rice singlet energy unaffected. By comparing the experimental data to time-dependent spectra of single-and three-band Hubbard models, we assign this effect to a ∼ 140 meV reduction of the onsite Coulomb repulsion on the copper sites. Our demonstration of a dynamical Hubbard U renormalization in a copper oxide paves the way to a novel strategy for the manipulation of superconductivity, magnetism, as well as to the realization of other long-range-ordered phases in light-driven quantum materials.

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Ultrafast dynamical Lifshitz transition

Cited by 68 publications

References 41 publications

Cavity engineering of Hubbard U via phonon polaritons

Cavity engineering of Hubbard U via phonon polaritons

A machine learning route between band mapping and band structure

Ultrafast renormalization of the onsite Coulomb repulsion in a cuprate superconductor

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