Anisotropic attosecond charge carrier dynamics and layer decoupling in quasi-2D layered

Calley N. Eads, Dmytro Bandak, Mahesh R. Neupane, Dennis Nordlund, Oliver L.A. Monti

Research output: Research - peer-reviewArticle

Abstract

Strong quantum confinement effects lead to striking new physics in two-dimensional materials such as graphene or transition metal dichalcogenides. While spectroscopic fingerprints of such quantum confinement have been demonstrated widely, the consequences for carrier dynamics are at present less clear, particularly on ultrafast timescales. This is important for tailoring, probing, and understanding spin and electron dynamics in layered and two-dimensional materials even in cases where the desired bandgap engineering has been achieved. Here we show by means of core-hole clock spectroscopy that SnS2 exhibits spin-dependent attosecond charge delocalization times (τ deloc) for carriers confined within a layer, τ deloc < 400 as, whereas interlayer charge delocalization is dynamically quenched in excess of a factor of 10, τ deloc > 2.7 fs. These layer decoupling dynamics are a direct consequence of strongly anisotropic screening established within attoseconds, and demonstrate that important two-dimensional characteristics are also present in bulk crystals of van der Waals-layered materials, at least on ultrafast timescales.

LanguageEnglish (US)
Article number1369
JournalNature Communications
Volume8
Issue number1
DOIs
StatePublished - Dec 1 2017

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decoupling
charge carriers
Graphite
Physics
Dermatoglyphics
Spectrum Analysis
Metals
Electrons
Charge carriers
Quantum confinement
spin dynamics
clocks
interlayers
graphene
screening
transition metals
engineering
physics
metals
spectroscopy

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

Cite this

Anisotropic attosecond charge carrier dynamics and layer decoupling in quasi-2D layered. / Eads, Calley N.; Bandak, Dmytro; Neupane, Mahesh R.; Nordlund, Dennis; Monti, Oliver L.A.

In: Nature Communications, Vol. 8, No. 1, 1369, 01.12.2017.

Research output: Research - peer-reviewArticle

Eads, Calley N. ; Bandak, Dmytro ; Neupane, Mahesh R. ; Nordlund, Dennis ; Monti, Oliver L.A./ Anisotropic attosecond charge carrier dynamics and layer decoupling in quasi-2D layered. In: Nature Communications. 2017 ; Vol. 8, No. 1.
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