Direct Measurement of Electron-Phonon Coupling with Time-Resolved ARPES

Giovannini, Umberto De; Hübener, Hannes; Sato, Shunsuke A.; Rubio, Ángel

doi:10.1103/physrevlett.125.136401

Cited by 34 publications

(18 citation statements)

References 32 publications

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“…This can be observed in tr-ARPES as an oscillation of the spectral function at a given k-point and by fitting this movement in energy on can extract the electron phonon coupling 81,82 . Alternatively one can perform a Fourier transform of the time-series obtained by tr-ARPES for each point in the energy-momentum map and reconstruct the ARPES map at a given frequency 25,83,84 , c.f. Fig.…”

Section: A Condition 3: Short-probe In the Non-overlapping Regimementioning

confidence: 99%

“…In this article we will present another realistic and accurate approach for the first-principles computation of time-resolved ARPES that is based on time-dependent density functional theory (TDDFT) [15][16][17][18][19][20][21][22][23][24][25][26][27][28] . While in principle equivalent in scope and accuracy for coherent excitations to the quasiparticle method, TDDFT is lim- FIG.…”

Section: Introductionmentioning

confidence: 99%

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First-principles modelling for time-resolved ARPES under different pump-probe conditions

De Giovannini,

Sato,

Hübener

et al. 2021

Preprint

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Section: A Condition 3: Short-probe In the Non-overlapping Regimementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

First-principles modelling for time-resolved ARPES under different pump-probe conditions

De Giovannini,

Sato,

Hübener

et al. 2021

Preprint

Self Cite

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“…Among them, time-and angle-resolved photoemission spectroscopy (trARPES) combines the direct measurement of electronic structure, with the ability to probe electron-phonon couplings on their intrinsic timescales -from femtoseconds on up. By monitoring either phonon-mediated electron scattering processes [23] or band dynamics in the presence of coherent phonons [24][25][26][27], certain phonon modes can be selectively excited or coupled. In particular, ultrafast laser-excited coherent phonons [28] can modulate the electronic structure in a momentum-dependent way, which can be characterized by band-and mode-projected electron-phonon coupling strengths [29,30].…”

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confidence: 99%

Creation of a novel inverted charge density wave state

Zhang

Shi

Guan

et al. 2022

Structural Dynamics

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Charge density wave (CDW) order is an emergent quantum phase that is characterized by a periodic lattice distortion and charge density modulation, often present near superconducting transitions. Here we uncover a novel inverted CDW state by using a femtosecond laser to coherently over-drive the unique star-of-David lattice distortion in 1T-TaSe2. We track the signature of this novel CDW state using time-and angle-resolved photoemission spectroscopy and time-dependent density functional theory, and validate that it is associated with a unique lattice and charge arrangement never before realized. The dynamic electronic structure further reveals its novel properties, that are characterized by an increased density of states near the Fermi level, high metallicity, and altered electron-phonon couplings. Our results demonstrate how ultrafast lasers can be used to create unique states in materials, by manipulating charge-lattice orders and couplings.

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“…Time-resolved ARPES (trARPES) addresses this problem by observing the spectral function of a material after excitation via a femtosecond optical pulse [1]. The momentumresolved distribution of excited states combined with the dynamical information on state lifetimes provides a powerful view into excited solids [2], extending the scope of ARPES and allowing to observe out-of-equilibrium electronic properties which can be used to extract the electronic coupling with phonons and other degrees of freedom [3,4]. Ultimately, understanding matter out-of-equilibrium is mandatory for achieving optical control in complex materials [5].…”

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confidence: 99%

Excited-state band structure mapping

Puppin,

Nicholson,

Monney

et al. 2021

Preprint

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Angle-resolved photoelectron spectroscopy is an extremely powerful probe of materials to access the occupied electronic structure with energy and momentum resolution. However, it remains blind to those dynamic states above the Fermi level that determine technologically relevant transport properties. In this work, we extend band structure mapping into the unoccupied states and across the entire Brillouin zone by using a state-of-the-art high repetition rate, extreme ultraviolet femtosecond light source to probe optically excited samples. The wide-ranging applicability and power of this approach are demonstrated by measurements on the 2D semiconductor WSe 2 , where the energy-momentum dispersion of valence and conduction bands are observed in a single experiment.This provides a direct momentum-resolved view not only on the complete out-of-equilibrium band gap but also on its renormalization induced by electron-hole interaction and screening. Our work establishes a new benchmark for measuring the band structure of materials, with direct access to the energy-momentum dispersion of the excited-state spectral function.

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Direct Measurement of Electron-Phonon Coupling with Time-Resolved ARPES

Cited by 34 publications

References 32 publications

First-principles modelling for time-resolved ARPES under different pump-probe conditions

First-principles modelling for time-resolved ARPES under different pump-probe conditions

Creation of a novel inverted charge density wave state

Excited-state band structure mapping

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