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Correlating Tomographic Chemical Inhomogeneity and Low Energy Electronic Structure in Layered Quantum Materials

Technical Report ·
DOI:https://doi.org/10.2172/1963495· OSTI ID:1963495
 [1];  [1];  [2];  [3];  [2];  [4];  [5];  [6];  [5];  [5];  [7];  [8];  [8];  [3];  [9];  [10];  [11];  [12];  [7];  [13] more »;  [14];  [4];  [15];  [16];  [17];  [2] « less
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); Univ. of California, Davis, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  3. Univ. of California, Davis, CA (United States)
  4. University of West Bohemia, Pilsen (Czech Republic)
  5. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); Oregon State Univ., Corvallis, OR (United States)
  7. Imperial College, London (United Kingdom)
  8. Rutgers Univ., New Brunswick, NJ (United States)
  9. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  10. Univ. of Twente, Enschede (Netherlands). MESA+ Inst. for Nanotechnology
  11. SPring-8, Japan Synchrotron Radiation Research Institute (JSRRI), Sayo (Japan)
  12. Japan Atomic Energy Agency (JAEA), Oarai (Japan)
  13. Stanford Univ., CA (United States)
  14. Temple Univ., Philadelphia, PA (United States)
  15. Univ. of California, Davis, CA (United States). Dept. of Physics
  16. Univ. of California, Davis, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  17. Univ. of California, Davis, CA (United States); Forschungszentrum Juelich (Germany)
+ Show Author Affiliations

Photoemission spectroscopy (PES) is a suite of experimental tools to learn about the electronic and chemical structure of materials and surfaces. Normally implemented in a surface-sensitive manner, the research performed under this grant focused on pushing PES into less explored regimes, to reveal bulk electronic structure, to reveal tomographic (layer-resolved) chemistry and electronic structure of layered materials and heterostructures, and to reveal interface phenomena at the junction of two different materials. Standing wave (SW) spectroscopies have also been applied to PdCoO2, a material of interest due to its high conductivity and electron-hydrodynamic tendencies. This material can be modeled as an alternating layered structure consisting of metallic Pd layers and insulating CoO2 layers. Using SW XPS, the total electronic structure has been decomposed into contributions from the two layers, and computations highlighted the different many-body interactions in the two layers (Comm. Phys. 4, 143 (2021)). We have also used hard-x-ray angle-resolved photoemission spectroscopy (ARPES), to investigate LaB6, a technologically important material with widespread application as a cathode material for electron microscopes. We measured the bulk electronic structure of this material and found that the one-step model of photoemission better captured the electronic structure and correlations. This model treats the three steps of the photoemission process—excitation, transport of the photoelectron to the crystal surface, and escape into the vacuum—as a single quantum mechanically coherent process (Phys. Rev. Mater. 5, 055002 (2021)). We also applied x-ray photoelectron spectroscopy, implemented in a near total reflection grazing incidence geometry to elucidate technologically relevant interfaces, such as those between a substrate and photoresist (J. Phys. D: Appl. Phys. 54 464002 (2021)).

Research Organization:
Univ. of California, Davis, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
DOE Contract Number:
SC0014697
OSTI ID:
1963495
Report Number(s):
DOE-DAVIS-14697-1; TRN: US2403682
Country of Publication:
United States
Language:
English

References (5)

Bulk electronic structure of lanthanum hexaboride ( LaB6 ) by hard x-ray angle-resolved photoelectron spectroscopy journal May 2021
Hard x-ray standing-wave photoemission study of the interfaces in a BiFeO$_3$/La$_{0.7}$Sr$_{0.3}$MnO$_3$ superlattice preprint January 2020
Orbital contributions in the element-resolved valence electronic structure of Bi 2 Se 3 journal December 2021
Near total reflection x-ray photoelectron spectroscopy: quantifying chemistry at solid/liquid and solid/solid interfaces journal September 2021
Layer-resolved many-electron interactions in delafossite PdCoO2 from standing-wave photoemission spectroscopy journal June 2021

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