Attosecond clocking of correlations between Bloch electrons

Freudenstein, Josef; Borsch, Markus; Meierhofer, Manuel; Afanasiev, D.; Schmid, Christoph; Sandner, Fabian; Liebich, Marlene; Girnghuber, Anna; Knorr, Matthias; Kira, M.; Huber, Rupert

doi:10.1038/s41586-022-05190-2

Cited by 50 publications

(27 citation statements)

References 47 publications

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“…Im Experiment können wir die Stärke der Coulomb‐Wechselwirkung einstellen, indem wir eine 60 nm dicke Probe WSe 2 mit einer atomar dünnen Schicht desselben Materials vergleichen [2]. In der ultimativ dünnen Schicht können die elektrischen Feldlinien zwischen Elektron und Loch oben und unten aus der Probe heraustreten, sodass sie nicht effektiv abgeschirmt werden.…”

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Attosekunden‐Stoppuhr für Kristalle

Freudenstein

Meierhofer

Huber

et al. 2023

Physik in unserer Zeit

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Section: Abbunclassified

Attosekunden‐Stoppuhr für Kristalle

Freudenstein

Meierhofer

Huber

et al. 2023

Physik in unserer Zeit

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“…In conventional III-V semiconductors the screening leads to exciton binding energies of only a few meV and Coulomb resonances Ref. [21] found significant influences of Coulomb correlations on strong-field interactions by comparing high-order side-band generation in bulk and ML WSe 2 . Here, we study the influence of Coulomb correlations on HHG at the example of ML MoS 2 .…”

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confidence: 99%

“…We found here that these effects are of minor importance in the regime of extreme strong-field interactions. Thus, we can use the same methodology based on the regular semiconductor Bloch equations (SBE) as described in Refs [7,19,21]. to study the influence of Coulomb correlations on HHG in ML-TMDC.…”

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confidence: 99%

Coulomb enhancement of high harmonic generation in monolayer transition metal dichalcogenides

Hader¹,

Neuhaus²,

Moloney³

et al. 2023

Preprint

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High harmonic generation (HHG) in monolayer MoS₂ is studied using fully microscopic many-body models based on the semiconductor Bloch equations and density functional theory. It is shown that Coulomb correlations lead to a dramatic enhancement of HHG. Especially near the bandgap enhancements of two orders of magnitude or more are observed for a wide range of excitation wavelengths and intensities. For excitation near or above the excitonic resonances the Coulomb interaction leads to dressed harmonics with spectrally broad sub-floors. The widths of these sub-floors depends strongly on the dephasing time for polarizations. For times on the order of ten femtoseconds the broadenings are comparable to the Rabi energies and reach one eV at fields of about 50 MV/cm. The intensities of these contributions are about four to six orders below the peaks of the harmonics.

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“…As an analogue of the interband HHG, high-order sideband generation (HSG) [23,24] has also received considerable interest since the last decade [25][26][27][28][29][30][31][32][33]. HSG occurs in semiconductors when an electron-hole pair is created by a relatively weak near-infrared (NIR) laser with a photon energy Ω close to the bandgap E g and then accelerated by a strong terahertz (THz) field with a photon energy ω E g .…”

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confidence: 99%

“…Frequency combs of sidebands with orders n > 100 (66 sidebands) have been produced from HSG [29]. HSG has also played a role in probing Berry curvatures [28], band structures [31], and electron correlations [33].…”

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An explicit formula for high-order sideband polarization by extreme tailoring of Feynman path integrals

Wu¹,

Sherwin²

2023

Preprint

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High-order sideband generation (HSG), as an analogue of the interband processes in high-harmonic generation (HHG) in solids, is a nonperturbative nonlinear optical phenomenon in semiconductors that are simultaneously driven by a relatively weak near-infrared (NIR) laser and a sufficiently strong terahertz (THz) field. We derive an explicit formula for sideband polarization vectors in a prototypical two-band model based on the saddle-point method. Our formula connects the sideband amplitudes with the laser-field parameters, electronic structures, and nonequilibrium dephasing rates in a highly nontrivial manner. Our results indicate the possibility of extracting information on band structures and dephasing rates from high-order sideband generation experiments with simple algebraic calculations. We also expect our approach to be useful on the quantitative understanding of the interband HHG.

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Attosecond clocking of correlations between Bloch electrons

Cited by 50 publications

References 47 publications

Attosekunden‐Stoppuhr für Kristalle

Attosekunden‐Stoppuhr für Kristalle

Coulomb enhancement of high harmonic generation in monolayer transition metal dichalcogenides

An explicit formula for high-order sideband polarization by extreme tailoring of Feynman path integrals

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