Attosecond Time-Resolved Photoemission Spectroscopy in Condensed Matter—Photoelectron Wave Phase Shifts and Time Delays

Heinzmann, Ulrich

doi:10.1007/978-3-642-37623-8_13

Cited by 8 publications

(6 citation statements)

References 49 publications

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“…allows to extract a relative time delay of ≃ 76 as between the and the electron near = 7 eV (Heinzmann, 2013). In the present case this experimental observation implies that formation of the outgoing wavepacket in the partial wave is considerably delayed relative to that in the wave.…”

Section: B Time Delay Operatorsupporting

confidence: 60%

“…Remarkably, this relative delay has been first observed in time-integral but angle-and spin-resolved photoemission (Heinzmann and Dil, 2012;Heinzmann, 2013). The close correspondence between the quantum and classical time shifts for Coulomb-interacting particles has several important consequences.…”

Section: Coulomb Scattering and Coulomb Time Delaymentioning

confidence: 87%

“…It is therefore tempting to inquire into alternative routes to access such time delay information without performing attosecond time-resolved measurements. Since the time delay is determined by the spectral variation of the partialwave scattering phase, the energy variation of the scattering probability or cross section for electron scattering Heinzmann and Dil, 2012;Heinzmann, 2013) that the dynamical spin polarization ⊥ perpendicular to the scattering plane defined by an incoming circularly polarized photon and an outgoing electron is a function of the difference between partial waves accessible by photoionization. Emission of spin-polarized photoelectrons originally predicted by Fano (Fano, 1969) for circularly polarized light (the so-called Fano-effect) was later generalized by Cherepkov (Cherepkov, 1979) to the case of linearly polarized light in angular resolved photoemission.…”

Section: B Time Delay Operatormentioning

confidence: 99%

“…This explanation relies on a classical transport model Lemell et al, 2009;Liao and Thumm, 2014) for electron emission from the solid. Calculation and interpretation of the observed time delays raises important conceptual questions about photoionization from such extended many-electron systems (Heinzmann, 2013) for time-integral photoemission. by an XUV pulse from surfaces: 1: primary transition from a core level to a high-lying continuum level assuming the spectator electrons remain frozen, 2: transport of a Bloch wavepacket towards the surface accompanied by electronelectron collisions leaving a particle-hole excitation, and 3: ejection of the photoelectron into vacuum with asymptotic momentum ⃗ .…”

Section: Time-resolved Photoemission From Surfacesmentioning

confidence: 99%

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Attosecond chronoscopy of photoemission

2015

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Recent advances in the generation of well characterized sub-femtosecond laser pulses have opened up unpredicted opportunities for the real-time observation of ultrafast electronic dynamics in matter. Such attosecond chronoscopy allows a novel look at a wide range of fundamental photophysical and photochemical processes in the time domain, including Auger and autoionization processes, photoemission from atoms, molecules, and surfaces, complementing conventional energy-domain spectroscopy. Attosecond chronoscopy raises fundamental conceptual and theoretical questions as which novel information becomes accessible and which dynamical processes can be controlled and steered. These questions are currently a matter of lively debate which we address in this review. We will focus on one prototypical case, the chronoscopy of the photoelectric effect by attosecond streaking. Is photoionization instantaneous or is there a finite response time of the electronic wavefunction to the photoabsorption event? Answers to this question turn out to be far more complex and multi-faceted than initially thought. They touch upon fundamental issues of time and time delay as observables in quantum theory. We review recent progress of our understanding of time-resolved photoemission from atoms, molecules, and solids. We will highlight the unresolved and open questions and we point to future directions aiming at the observation and control of electronic motion in more complex nanoscale structures and in condensed matter.

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Section: B Time Delay Operatorsupporting

confidence: 60%

Section: Coulomb Scattering and Coulomb Time Delaymentioning

confidence: 87%

Section: B Time Delay Operatormentioning

confidence: 99%

Section: Time-resolved Photoemission From Surfacesmentioning

confidence: 99%

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Attosecond chronoscopy of photoemission

2015

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“…So, the difference between departure of s-and d-electrons depend on, including, the calculated here EWS-times ) ( 0 E  and ) ( 2 E  . Such time delay for pure atomic targets was observed and measured in recent experiments [12].…”

Section: Discussionmentioning

confidence: 52%

Time delay of slow electrons-endohedral elastic scattering

Amusia

Baltenkov

2019

Fullerenes, Nanotubes and Carbon Nanostructures

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We discuss the temporal picture of electron collisions with fullerene. Within the framework of a Dirac bubble potential model for the fullerene shell, we calculate the time delay in slowelectron elastic scattering by it. It appeared that the time of transmission of an electron wave packet through the Dirac bubble potential sphere that simulates a real potential of the C 60 reaches up to 10 4 attoseconds. Resonances in the time delays are due to the temporary trapping of electron into quasi-bound states before it leaves the interaction region. As concrete targets we choose almost ideally spherical endohedrals C 20 , C 60 , C 72 , and C 80 . We present dependences of time-delay upon collision energy.

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