All-optical attoclock for imaging tunnelling wavepackets

Babushkin, Ihar; Galán, Álvaro Jiménez; Andrade, J. R. C.; Husakou, Anton; Morales, Felipe; Kretschmar, Martin; Nagy, Tamás; Vaičaitis, V.; Shi, Liping; Zuber, David; Bergé, Luc; Skupin, Stefan; Nikolaeva, Irina; Panov, N. A.; Kosareva, O.G.; Pfeiffer, Adrian N.; Demircan, Ayhan; Vrakking, Marc J. J.; Morgner, Uwe; Ivanov, Misha

doi:10.1038/s41567-022-01505-2

Cited by 18 publications

(11 citation statements)

References 48 publications

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“…Given the enormous advances in attosecond science (see, for example, Refs. [31,32] and references therein for all-optical imaging of tunneling electrons), "Zeno-assisted tunneling" could be implemented in practice, which would impact the diverse phenomena where QT is a key player.…”

Section: Discussionmentioning

confidence: 99%

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Enhanced quantum tunneling in quantum Zeno dynamics freezing the momentum direction

2022

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Quantum tunneling is a fundamental quantum-mechanical effect involved in plenty of physical phenomena. Its control would impact these phenomena and the technologies based on them. We show that the quantum tunneling probability through a potential barrier can be increased to approach unity in a quantum Zeno dynamics undergone by the tunneling particle in which the direction of the momentum is frequently monitored. We first model the measurements of the momentum direction as selective von Neumann projections, and then as nonselective, direction-sensitive interactions of the particle with probe particles. Nonselective measurements are more efficient than selective measurements in enhancing the quantum tunneling probability.

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Section: Discussionmentioning

confidence: 99%

“…In optics, promoting electron tunneling can have an impact in photoelectron ionization generating high harmonics. Vice versa, high harmonics are being employed to probe with attosecond resolution proton dynamics [30] and electrons tunneling a barrier [31,32]. These breakthroughs would bring closer to hand an implementation of this QZD.…”

Section: Introductionmentioning

confidence: 99%

Enhanced quantum tunneling in quantum Zeno dynamics freezing the momentum direction

2022

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“…[18,19] Low-order harmonics in HHG can be caused by different mechanisms: 1) perturbative-type wave-mixing; [20,21] 2) intraband Bloch oscillations in the conduction band of crystalline solids; [7,22] and 3) Brunel harmonics, caused by the ionization/excitation nonlinearity with delocalized electrons moving in vicinity of atoms. [23,24] Brunel harmonics were discovered and discussed in gases, [23] and have recently attracted a renewed attention in solids. [20,24,25] More interestingly, they have been found to contain signatures of attosecond-and sub-angstrom-scale electron dynamics in the material, which can serve as a viable tool to image the reshaping of the electronic wavepacket during laserinduced tunneling.…”

Section: Introductionmentioning

confidence: 99%

Resonance Effect in Brunel Harmonic Generation in Thin Film Organic Semiconductors

Saleh

Sharma

et al. 2023

Advanced Optical Materials

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Nonlinear optical properties of organic semiconductors (OSCs) have been extensively investigated in the perturbative regime, while strong light induced high‐order processes in solid‐state OSCs are less studied. Here, below‐threshold harmonic generation is examined, both experimentally and theoretically, in two solid‐state thin film OSCs, that is, tetraphenylporphyrin and zinc tetraphenylporphyrin. Results show that the π–π* excitations of the porphyrin ring system generate the harmonic emission. The contribution of the Brunel harmonic to the 5th harmonic emission is uncovered, where the resonant 5‐photon transition (S0 → S2 transition) is found to lead to an early onset of non‐perturbative behavior. A similar resonance effect is expected in Brunel harmonic generation in other organic materials.

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“…Three possible ionization-related mechanisms have been * juergens@mbi-berlin.de discussed in the context of HHG [18,19]. Brunel harmonics, arising from the acceleration of quasi-free carriers excited by photoionization have been analyzed in gases, clusters, bulk solids and thin films [20][21][22][23][24]. Moreover, after non-resonant photoionization an excited electron has nonzero velocity which provides sub-cycle contributions to the polarization and gives rise to the generation of harmonics.…”

Section: Introductionmentioning

confidence: 99%

Linking High-Harmonic Generation and Strong-Field Ionization in Bulk Crystals

Jürgens¹,

Abbing²,

Mero³

et al. 2023

Preprint

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The generation of high-order harmonics in bulk solids subjected to intense ultrashort laser pulses has opened up new avenues for research in extreme nonlinear optics and light-matter interaction on sub-cycle timescales. Despite significant advancement over the past decade, a complete understanding of the involved phenomena is still lacking. High-harmonic generation in solids is currently understood as arising from nonlinear intraband currents, interband recollision and ionization-related phenomena. As all of these mechanisms involve or rely upon laser-driven excitation we combine measurements of the angular dependence of nonlinear absorption and high-order harmonic generation in bulk crystals to demonstrate the relation between high-harmonic emission and nonlinear, laser-induced ionization in solids. An unambiguous correlation between the emission of harmonics and laser-induced ionization is found experimentally, that is supported by numerical solutions of the semiconductor Bloch equations and calculations of orientation-dependent ionization rates using maximally localized Wannier-functions.

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All-optical attoclock for imaging tunnelling wavepackets

Cited by 18 publications

References 48 publications

Enhanced quantum tunneling in quantum Zeno dynamics freezing the momentum direction

Enhanced quantum tunneling in quantum Zeno dynamics freezing the momentum direction

Resonance Effect in Brunel Harmonic Generation in Thin Film Organic Semiconductors

Linking High-Harmonic Generation and Strong-Field Ionization in Bulk Crystals

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