Time-resolved 3D imaging of ultrafast spin–orbit wave packet dynamics

Bayer, Tim; Gräfing, Daniela; Kerbstadt, S.; Pengel, Dominik; Eickhoff, K.; Englert, Lars; Wollenhaupt, M.

doi:10.1088/1367-2630/aafb87

Cited by 18 publications

(16 citation statements)

References 48 publications

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“…In addition, a modification of the scheme presented in Ref. [56] where they combine bichromatic polarization pulse shaping with photoelectron imaging tomography for time-resolved spatial imaging of an ultrafast SO-split wave packet could afford a suitable experimental tool for testing our results on the time-dependent modulation of the coherent state wave packet spin polarization. We note that if one would be interested in experimentally addressing some "nonuniversal" features of the photoconductivity in graphene-like systems effects of doping and finite temperature would need to be included [57].…”

Section: Discussionmentioning

confidence: 99%

Photoinduced electronic and spin properties of two-dimensional electron gases with Rashba spin-orbit coupling under perpendicular magnetic fields

2020

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We theoretically investigate photoinduced phenomena induced by time-periodic driving fields in twodimensional electron gases under perpendicular magnetic fields with Rashba spin-orbit coupling. Using perturbation theory, we provide analytical results for the Floquet-Landau energy spectrum appearing due to THz radiation. By employing the resulting photomodulated states, we compute the dynamical evolution of the spin polarization function for an initially prepared coherent state. We find that the interplay of the magnetic field, Rashba spin-orbit interaction, and THz radiation can lead to nontrivial beating patterns in the spin polarization. The dynamics also induces fractional revivals in the autocorrelation function due to interference of the photomodulated quantum states. We calculate the transverse photoassisted conductivity in the linear response regime using Kubo formalism and analyze the impact of the radiation field and Rashba spin-orbit interaction. In the static limit we find that our results reduce to well-known expressions of the conductivity in nonrelativistic and quasirelativistic (topological insulator surfaces) two-dimensional electron gas thoroughly described in the literature. We discuss the possible experimental detection of our theoretical prediction and their relevance for spin-orbit physics at high magnetic fields.

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Section: Discussionmentioning

confidence: 99%

Photoinduced electronic and spin properties of two-dimensional electron gases with Rashba spin-orbit coupling under perpendicular magnetic fields

2020

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“…The two prototypes of linearly polarized bichromatic pulse sequences, PLP and OLP fields, are illustrated in Figures 7A,B, respectively. To illustrate the difference between interband and intraband interferences in optical phase-control, we discuss below the results from bichromatic MPI of alkali atoms using CEP-stable commensurable PLP (3ω:4ω) fields [73] on the one hand and incommensurable OLP bichromatic fields [99,100] on the other hand. We start by investigating phasesensitive interband interferences arising from the superposition of continuum states with opposite parity [73,188].…”

Section: Linearly Polarized Bichromatic Pulse Sequencesmentioning

confidence: 99%

“…Due to the energetic disentanglement of the different photoelectron contributions from intraband interference, this scheme is suitable for pumpprobe experiments featuring background-free detection of ultrafast dynamics. For example, employing shaper-generated linearly polarized bichromatic pump-probe pulse sequences, we investigated Rydberg [177] and spin-orbit [100] wave packet dynamics. The full potential of polarization-shaped bichromatic fields to generate and manipulate angular momentum superposition states via frequency mixing has been studied in [99].…”

Section: Linearly Polarized Bichromatic Pulse Sequencesmentioning

confidence: 99%

“…efficiency, robustness and the disentanglement of target states, make frequency mixing a well-suited test-bed for bichromatic pumpprobe studies. The potential of shaper-based bichromatic pumpprobe spectroscopy was recently demonstrated on the examples of time-and angular-resolved measurement [177] and holographic observation [101] of ultrafast Rydberg dynamics and the time-resolved 3D imaging of ultrafast SOWP dynamics in potassium atoms [100]. In the latter experiment, the LCP blue pulse (pump) was tuned on resonance with the two 4p fine structure states 4p 1/2 and 4p 3/2 .…”

Section: Circularly Polarized Bichromatic Pulse Sequencesmentioning

confidence: 99%

“…Applications of photoelectron tomography have ranged from the generation and characterization of designer electron wave packets [95,96] and multiphoton photoelectron circular dichroism (PECD) measurements [97] to the extraction of transition matrix elements from tomographic data [98]. More recently, we have used photoelectron tomography to study free electron angular momentum wave packets [99], spin-orbit [100] and Rydberg wave packet dynamics [101] and photoelectron vortices with even [102][103][104] and odd [73] rotational symmetries. An overview of our recent photoelectron tomography studies of coherent control of atomic MPI can be found in [105,106].…”

Section: Introductionmentioning

confidence: 99%

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Multichromatic Polarization-Controlled Pulse Sequences for Coherent Control of Multiphoton Ionization

et al. 2021

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In this review, we report on recent progress in the generation and application of multichromatic polarization-tailored pulse sequences for the coherent control of multiphoton ionization (MPI) dynamics and present unpublished experimental results that complement our previous findings. Specifically, we utilize single-color, bichromatic, and trichromatic polarization-controlled pulse sequences generated by spectral amplitude, phase and polarization modulation of a carrier-envelope phase (CEP)-stable white light supercontinuum for MPI. The analysis of the number of ionization pathways and the number of distinct final free electron states shows that both increase significantly, but scale differently with the number of absorbed photons and the number of pulses in the sequence. In our experiments, ultrafast polarization shaping is combined with high-resolution photoelectron tomography to generate, control, and reconstruct three-dimensional photoelectron momentum distributions from atomic and molecular MPI. We discuss the use of polarization-controlled single-color and bichromatic pulse sequences in perturbative and non-perturbative coherent control of coupled electron-nuclear dynamics in molecules, atomic spin-orbit wave packet dynamics and the directional photoemission from atoms and chiral molecules. We compare the coherent control of CEP-insensitive intraband multipath interference in the MPI with a fixed number of photons with CEP-sensitive interband multipath interference in the ionization with a different number of photons. The generation and control of free electron vortices with even-numbered rotational symmetry by MPI with single-color pulse sequences is contrasted with the bichromatic control of CEP-sensitive electron vortices with odd-numbered rotational symmetry. To illustrate the potential of multichromatic pulse sequences for coherent control, we present a trichromatic scheme for shaper-based quantum state holography.

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