Double-slit photoelectron interference in strong-field ionization of the neon dimer

Kunitski, Maksim; Eicke, Nicolas; Huber, P.; Köhler, Jonas; Zeller, S.; Voigtsberger, J.; Schlott, Nikolai; Henrichs, K.; Sann, H.; Trinter, Florian; Schmidt, L. Ph. H.; Kalinin, Anton; Schöffler, M. S.; Jahnke, T.; Lein, Manfred; Dørner, R.

doi:10.1038/s41467-018-07882-8

Cited by 10,243 publications

(4,436 citation statements)

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“…It had been observed in various molecular ionization processes and, more recently, in strong field phenomena including high order harmonic generation and above threshold ionization [22][23][24][25][26][27]. This effect is further exemplified in weakly bound noble gas clusters where it depends sensitively on the symmetry of the dissociative ionic state [28]. We confirm it here by conducting the SPM calculations on the Ne 2 dimer.The rest of the paper is organized as follows.…”

supporting

confidence: 74%

Numerical attoclock on atomic and molecular hydrogen

2019

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Numerical attoclock is a theoretical model of attosecond angular streaking driven by a very short, nearly a single oscillation, circularly polarized laser pulse. The reading of such an attoclock is readily obtained from a numerical solution of the time-dependent Schrödinger equation as well as a semi-classical trajectory simulation. By making comparison of the two approaches, we highlight the essential physics behind the attoclock measurements. In addition, we analyze the predictions the Keldysh-Rutherford model of the attoclock [Phys. Rev. Lett. 121, 123201 (2018)]. In molecular hydrogen, we highlight a strong dependence of the width of the attoclock angular peak on the molecular orientation and attribute it to the two-center electron interference. This effect is further exemplified in the weakly bound neon dimer. 32.80.Fb The experimental technique of attosecond angular streaking (attoclock) is based on measuring an offset angle of the peak photoelectron momentum distribution (PMD) in the polarization plane of a close-to-circularly polarized laser pulse. The attoclock attempts to relate this offset angle with the time the tunneling electron spends under the barrier (tunneling time) [1][2][3][4]. As the tunneling is an exponentially suppressed process, it occurs predominantly at the peak of the driving laser pulse. At this instant, the electric field is aligned with the major axis of the polarization ellipse. The photoelectron emerges from the tunnel with the zero velocity and its canonical momentum captures the vector potential of the laser field at the time of exit. This momentum is carried to the detector and its angular displacement relative to the minor polarization axis is converted to the tunneling time τ = θ A /ω, where ω is the angular frequency of the driving field. A similar attoclock reading θ A can be obtained from numerical simulations with very short, nearly single oscillation, circularly polarized pulses. The utility of such a "numerical attoclock" is that it allows for treatment by various simplified, but more physically transparent, techniques such as an analytic R-matrix theory [5], a classical back-propagation analysis [6], classical-trajectory Monte Carlo simulations [7] and a classical Rutherford scattering model [8]. By making comparison with these models, numerical attoclock experiments firmly point to a vanishing tunneling time [5,6,8]. Similar conclusion was also reached in recent theoretical [9, 10] and experiemntal [11] works. The debate of the finite tunneling time is still open. Some authors continue to advocate a finite tunneling time [12][13][14] while others suggest that the whole concept is ill defined and no meaningful definition of the tunneling time can be given [15].Irrespective of the answer to the tunneling time conundrum, the principle of attoclock remains appealing and finds its application to more complex targets. In particular, there have been preliminary reports of attosecond angular streaking measurements on molecular hydrogen [16,17]. Coincident detection of pho...

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confidence: 74%

Numerical attoclock on atomic and molecular hydrogen

2019

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“…C. performance stems from the two -dimensional nanomaterial antimonene [220]. Antimonene has much stronger interaction with ssDNA, and the detection limit reached as low as 10 aM.…”

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confidence: 99%

Navigating the Pandemic Response Life Cycle: Molecular Diagnostics and Immunoassays in the Context of COVID-19 Management

Gharizadeh

Yue

et al. 2021

IEEE Rev. Biomed. Eng.

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Coronavirus disease 2019 (COVID-19) is an infectious disease caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). To counter COVID-19 spreading, an infrastructure to provide rapid and thorough molecular diagnostics and serology testing is the cornerstone of outbreak and pandemic management. We hereby review the clinical insights with regard to using molecular tests and immunoassays in the context of COVID-19 management life cycle: the preventive phase, the preparedness phase, the response phase and the recovery phase. The spatial and temporal distribution of viral RNA, antigens and antibodies during human infection is summarized to provide a biological foundation for accurate detection of the disease. We shared the lessons learned and the obstacles encountered during real world high-volume screening programs. Clinical needs are discussed to identify existing technology gaps in these tests. Leverage technologies, such as engineered polymerases, isothermal amplification, and direct amplification from complex matrices may improve the productivity of current infrastructure, while emerging technologies like CRISPR diagnostics, visual end point detection, and PCR free methods for nucleic acid sensing may lead to at-home tests. The lessons learned, and innovations spurred from the COVID-19 pandemic could upgrade our global public health infrastructure to better combat potential outbreaks in the future.

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“…This time regime is in particular important to study fundamental processes such as electronic decoherence, resulting from dephasing and electron-electron scattering on the femtosecond timescale. Alternatively to trARPES, indirect measurements, such as the generation of high-harmonics [40,42,[52][53][54][55] or a residual conducing current [3,16,17,56] can reveal information about the electron dynamics. Whereas the first one is sensitive to the inter-and intraband electron dynamics during the laser pulse, the latter is sensitive to the residual current density, which is a result of coherent quantum path interference of different Bloch trajectories [3,23].…”

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confidence: 99%

Sub-cycle temporal evolution of light-induced electron dynamics in hexagonal 2D materials

et al. 2020

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Two-dimensional materials with hexagonal symmetry such as graphene and transition metal dichalcogenides are unique materials to study light-field-controlled electron dynamics inside of a solid. Around the K-point, the dispersion relation represents an ideal system to study intricately coupled intraband motion and interband (Landau-Zener) transitions driven by the optical field of phase-controlled few-cycle laser pulses. Based on the coupled nature of the intraband and interband processes, we have recently observed in graphene repeated coherent Landau-Zener transitions between valence and conduction band separated by around half an optical period of 1.3 fs (Higuchi et al Nature 550, 224 (2017)). Due to the low temporal symmetry of the applied laser pulse, a residual current density and a net electron polarization are formed. Here we show extended numerical data on the temporal evolution of the conduction band population of 2D materials with hexagonal symmetry during the light-matter interaction, yielding deep insights to attosecond-fast electron dynamics. In addition, we show that a residual ballistic current density is formed, which strongly increases when a band gap is introduced. Both, the sub-cycle electron dynamics and the resulting residual current are relevant for the fundamental understanding and future applications of strongly driven electrons in two-dimensional materials, including graphene or transition metal dichalcogenide monolayers.

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Double-slit photoelectron interference in strong-field ionization of the neon dimer

Cited by 10,243 publications

References 47 publications

Numerical attoclock on atomic and molecular hydrogen

Numerical attoclock on atomic and molecular hydrogen

Navigating the Pandemic Response Life Cycle: Molecular Diagnostics and Immunoassays in the Context of COVID-19 Management

Sub-cycle temporal evolution of light-induced electron dynamics in hexagonal 2D materials

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