Ultrafast preparation and detection of ring currents in single atoms

Eckart, Sebastian; Kunitski, Maksim; Richter, Martin; Hartung, Alexander; Rist, J.; Trinter, Florian; Fehre, K.; Schlott, Nikolai; Henrichs, K.; Schmidt, L. Ph. H.; Jahnke, T.; Schöffler, M. S.; Liu, Kunlong; Barth, Ingo; Kaushal, Jivesh; Morales, Felipe; Ivanov, Misha; Smirnova, Olga; Dørner, R.

doi:10.1038/s41567-018-0080-5

Cited by 114 publications

(78 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Aside from the disparity in their respective magnitudes, a noticeable difference in the energy-dependence of co-and counter-rotating electrons appears: co-rotating electrons make their strongest contribution at the first above-threshold peak, whereas the contribution from counter-rotating electrons decreases monotonically with excess energy. Here we observe the first indication of similarity with existing results using ARM and PPT theories for Kr [2,5] and Ar [8], which have observed strong counter-rotating electron yields close to threshold, with the weaker signal of corotating electrons strengthening at higher energies. This trend is made clear in the energy distribution shown in Fig.…”

Section: A Selection Of Electron Rotationsupporting

confidence: 87%

“…For n n 0 , p 1 electrons dominate the detachment yield, although the yield at such energies is insignificant. Such variation has been observed in experiment [8], with ARM predictions agreeing well with the measured spectra and SAE calculations. Therefore, Eq.…”

Section: F Comparison With Analytical Expressionssupporting

confidence: 84%

“…Analogous expressions may also be obtained using the analytical R-matrix (ARM) technique [4][5][6][7], which can also account for Coulomb interactions when necessary. A notable recent study of ring currents in Ar demonstrated strong agreement between measured photoelectron spectra, ARM predictions, and those obtained from SAE simulations [8]. Here it was predicted that counter-rotating electrons dominate the ionization signal.…”

Section: Introductionmentioning

confidence: 52%

“…In both one-photon ionization and ionization from Rydberg states of hydrogen by microwave fields [71,72], it is well known that a circularly-polarized field preferentially ionizes corotating electrons. On the other hand, recent studies [2][3][4][5][6][7][8] have established that counter-rotating electrons are preferentially ionized in the strong-field regime.…”

Section: Resultsmentioning

confidence: 99%

“…Depending on the polarization direction, it is possible for a particular sign of the magnetic quantum number to be favoured over another, inducing an asymmetric yield distribution among the accessible magnetic sublevels. This phenomenon, which we term 'electron rotational asymmetry', has raised interest in the study of residual-ion ring currents induced by circularly-polarized fields [1][2][3][4][5][6][7][8], as well as in the production of spin-polarized electron bunches [9][10][11][12]. This asymmetry has also proved relevant for attoclock measurements using noble gases, particularly in relation to deflection angles of ejected electrons originating from different orbitals.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Electron rotational asymmetry in strong-field photodetachment from F− by circularly polarized laser pulses

Armstrong¹,

Clarke²,

Brown³

et al. 2019

Phys. Rev. A

View full text Add to dashboard Cite

We use the R-matrix with time-dependence method to study detachment from F − in circularlypolarized laser fields of infrared wavelength. By decomposing the photoelectron momentum distribution into separate contributions from detached 2p1 and 2p−1 electrons, we demonstrate that the detachment yield is distributed asymmetrically with respect to these initial orbitals. We observe the well-known preference for strong-field detachment of electrons that are initially counter-rotating relative to the field, and calculate the variation in this preference as a function of photoelectron energy. The wavelengths used in this work provide natural grounds for comparison between our calculations and the predictions of analytical approaches tailored for the strong-field regime. In particular, we compare the ratio of counter-rotating electrons to corotating electrons as a function of photoelectron energy. We carry out this comparison at two wavelengths, and observe good qualitative agreement between the analytical predictions and our numerical results. arXiv:1911.00290v1 [physics.atom-ph] 1 Nov 2019

show abstract

Section: A Selection Of Electron Rotationsupporting

confidence: 87%

Section: F Comparison With Analytical Expressionssupporting

confidence: 84%

Section: Introductionmentioning

confidence: 52%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Electron rotational asymmetry in strong-field photodetachment from F− by circularly polarized laser pulses

Armstrong¹,

Clarke²,

Brown³

et al. 2019

Phys. Rev. A

View full text Add to dashboard Cite

show abstract

Ringströme in einzelnen Atomen

Eckart¹,

Kunitski²,

Dørner³

2018

Physik in unserer Zeit

View full text Add to dashboard Cite

Ein Elektron, das einen Atomkern umkreist, entspricht einem Ringstrom. Unserer Forschungsgruppe an der Universität Frankfurt ist es gelungen, gezielt Elektronen mit einem bestimmten Umlaufsinn aus dem Atom zu lösen, sodass ein Atom ohne Ringstrom zu einem Ion mit definiertem Ringstrom wird [1]. Der Ionisationsprozess findet innerhalb eines Zeitfensters von wenigen Femtosekunden (10–15 Sekunden) statt.

show abstract

Ultrasensitive Field‐Effect Biosensors Enabled by the Unique Electronic Properties of Graphene

Zhang

Jing

Shen

et al. 2019

Small

View full text Add to dashboard Cite

This review provides a critical overview of current developments on nanoelectronic biochemical sensors based on graphene. Composed of a single layer of conjugated carbon atoms, graphene has outstanding high carrier mobility and low intrinsic electrical noise, but a chemically inert surface. Surface functionalization is therefore crucial to unravel graphene sensitivity and selectivity for the detection of targeted analytes. To achieve optimal performance of graphene transistors for biochemical sensing, the tuning of the graphene surface properties via surface functionalization and passivation is highlighted, as well as the tuning of its electrical operation by utilizing multifrequency ambipolar configuration and a high frequency measurement scheme to overcome the Debye screening to achieve low noise and highly sensitive detection. Potential applications and prospectives of ultrasensitive graphene electronic biochemical sensors ranging from environmental monitoring and food safety, healthcare and medical diagnosis, to life science research, are presented as well.

show abstract

Ultrafast preparation and detection of ring currents in single atoms

Cited by 114 publications

References 44 publications

Electron rotational asymmetry in strong-field photodetachment from F− by circularly polarized laser pulses

Electron rotational asymmetry in strong-field photodetachment from F− by circularly polarized laser pulses

Ringströme in einzelnen Atomen

Ultrasensitive Field‐Effect Biosensors Enabled by the Unique Electronic Properties of Graphene

Contact Info

Product

Resources

About