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<p>Highly efficient and reliable spin- and angle-resolved photoelectron spectroscopy (spin-ARPES) has been developed at the 4A2 beamline of Pohang Light Source II. The spin polarimeters based on exchange scattering by a ferromagnetic target were integrated into a <i>state-of-the-art</i> hemispherical electron analyzer, enabling us to obtain the electronic band structure with a three-dimensional spin polarization character. The figure of merit (FOM) of the spin polarimeter was proven to be higher than those of conventional Mott detectors by two orders. The spin-dependent electron reflectivity spectra of in situ grown ferromagnetic targets were obtained by the use of a kinetic energy control lens and they are utilized to optimize and stabilize the spin detection asymmetry. The overall performance was demonstrated by measuring the spin-ARPES spectra of the Dirac cone of <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="40042_2025_1385_Article_IEq1.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="46" /> </InlineMediaObject> <EquationSource Format="TEX">\(\hbox {Bi}_2 \hbox {Se}_3\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mtext>Bi</mtext> <mn>2</mn> </msub> <msub> <mtext>Se</mtext> <mn>3</mn> </msub> </mrow> </math></EquationSource> </InlineEquation>. </p>

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Development of highly efficient and stable spin polarimeter for an undulator-based angle-resolved photoemission spectroscopy beamline

  • 期刊论文

  • 发表日期：

    2025年5月14日

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  • Minki Sung,
  • Jiwon Jung,
  • Dongjoon Jeong,
  • Hyunjin Jung,
  • Han Woong Yeom,
  • Roland Stania,
  • Sangjun Park,
  • Jaeyoung Kim

摘要

Highly efficient and reliable spin- and angle-resolved photoelectron spectroscopy (spin-ARPES) has been developed at the 4A2 beamline of Pohang Light Source II. The spin polarimeters based on exchange scattering by a ferromagnetic target were integrated into a state-of-the-art hemispherical electron analyzer, enabling us to obtain the electronic band structure with a three-dimensional spin polarization character. The figure of merit (FOM) of the spin polarimeter was proven to be higher than those of conventional Mott detectors by two orders. The spin-dependent electron reflectivity spectra of in situ grown ferromagnetic targets were obtained by the use of a kinetic energy control lens and they are utilized to optimize and stabilize the spin detection asymmetry. The overall performance was demonstrated by measuring the spin-ARPES spectra of the Dirac cone of \(\hbox {Bi}_2 \hbox {Se}_3\) Bi 2 Se 3 .