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Sökning: WFRF:(Pincelli T.)

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1.
  • Beaulieu, S., et al. (författare)
  • Revealing Hidden Orbital Pseudospin Texture with Time-Reversal Dichroism in Photoelectron Angular Distributions
  • 2020
  • Ingår i: Physical Review Letters. - : American Physical Society (APS). - 0031-9007 .- 1079-7114. ; 125:21
  • Tidskriftsartikel (refereegranskat)abstract
    • We performed angle-resolved photoemission spectroscopy (ARPES) of bulk 2H-WSe2 for different crystal orientations linked to each other by time-reversal symmetry. We introduce a new observable called time-reversal dichroism in photoelectron angular distributions (TRDAD), which quantifies the modulation of the photoemission intensity upon effective time-reversal operation. We demonstrate that the hidden orbital pseudospin texture leaves its imprint on TRDAD, due to multiple orbital interference effects in photoemission. Our experimental results are in quantitative agreement with both the tight-binding model and state-of-the-art fully relativistic calculations performed using the one-step model of photoemission. While spin-resolved ARPES probes the spin component of entangled spin-orbital texture in multiorbital systems, we unambiguously demonstrate that TRDAD reveals its orbital pseudospin texture counterpart.
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2.
  • Maklar, J., et al. (författare)
  • A quantitative comparison of time-of-flight momentum microscopes and hemispherical analyzers for time- and angle-resolved photoemission spectroscopy experiments
  • 2020
  • Ingår i: Review of Scientific Instruments. - : AIP Publishing. - 0034-6748 .- 1089-7623. ; 91:12
  • Tidskriftsartikel (refereegranskat)abstract
    • Time-of-flight-based momentum microscopy has a growing presence in photoemission studies, as it enables parallel energy- and momentum-resolved acquisition of the full photoelectron distribution. Here, we report table-top extreme ultraviolet time- and angle-resolved photoemission spectroscopy (trARPES) featuring both a hemispherical analyzer and a momentum microscope within the same setup. We present a systematic comparison of the two detection schemes and quantify experimentally relevant parameters, including pump- and probe-induced space-charge effects, detection efficiency, photoelectron count rates, and depth of focus. We highlight the advantages and limitations of both instruments based on exemplary trARPES measurements of bulk WSe2. Our analysis demonstrates the complementary nature of the two spectrometers for time-resolved ARPES experiments. Their combination in a single experimental apparatus allows us to address a broad range of scientific questions with trARPES.
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  • Resultat 1-2 av 2
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tidskriftsartikel (2)
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refereegranskat (2)
Författare/redaktör
Wolf, M. (2)
Beaulieu, S. (2)
Dong, S. (2)
Pincelli, T. (2)
Dendzik, Maciej (2)
Maklar, J. (2)
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Rettig, L. (2)
Ernstorfer, R. (2)
Braun, J. (1)
Minar, J. (1)
Hricovini, K. (1)
Schusser, J. (1)
Schuler, M. (1)
Neef, A. (1)
Ebert, H. (1)
Windsor, Y. W. (1)
Xian, R. P. (1)
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Kungliga Tekniska Högskolan (2)
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Engelska (2)
Forskningsämne (UKÄ/SCB)
Naturvetenskap (2)
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2020 (2)

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