Electronic topological transitions in cadmium under pressure studied via theoretical and experimental x-ray absorption spectroscopy

Jasmine K. Hinton; Daniel Schacher; Wonseok Lee; G. Alexander Smith; Emily Siska; Changyong Park; Paul B. Ellison; Scott K. Cushing; Craig P. Schwartz; Keith V. Lawler; Ashkan Salamat

doi:10.1103/PhysRevB.110.205118

Electronic topological transitions in cadmium under pressure studied via theoretical and experimental x-ray absorption spectroscopy

Jasmine K. Hinton ^1,2,3,*,†, Daniel Schacher ^2,3,*, Wonseok Lee ^4,*, G. Alexander Smith ^5,6,*, Emily Siska², Changyong Park ⁷, Paul B. Ellison ^2,3, Scott K. Cushing ^4,‡, Craig P. Schwartz ^2,§ et al.

Keith V. Lawler ^2,∥ and Ashkan Salamat ^2,3,¶

¹Neutron Scattering Division, Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA
²Nevada Extreme Conditions Laboratory, University of Nevada, Las Vegas, Las Vegas, Nevada 89154, USA
³Department of Physics & Astronomy, University of Nevada Las Vegas, Las Vegas, Nevada 89154, USA
⁴Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA
⁵National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
⁶Department of Chemistry & Biochemistry, University of Nevada Las Vegas, Las Vegas, Nevada 89154, USA
⁷HPCAT, X-ray Science Division, Argonne National Laboratory, Lemont, Illinois 60439, USA

^*These authors contributed equally to this work.
^†Contact author: hintonjk@ornl.gov
^‡Contact author: scushing@caltech.edu
^§Contact author: craig.schwartz@unlv.edu
^∥Contact author: keith.lawler@unlv.edu
^¶Contact author: ashkan.salamat@unlv.edu

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Phys. Rev. B 110, 205118 – Published 7 November, 2024

DOI: https://doi.org/10.1103/PhysRevB.110.205118

Abstract

An electronic topological transition (ETT) in cadmium below 1 GPa is investigated in situ with experimental x-ray absorption spectroscopy and projecting calculated core-valence excitons onto the band structure. These projections are a useful application of the Bethe-Salpeter equation approach that considers many-body effects. The method described herein can be used for systems that are otherwise difficult to probe in situ; therefore, it provides a generalizable approach to identifying and understanding ETTs under high pressure. Although pressure-induced ETTs are often probed using indirect structural responses, our own x-ray diffraction and Raman studies suggest a second-order structural transition around 3 GPa but are largely insensitive to or inconclusive for the previously studied ETT in this region.

Physical Review B

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Electronic topological transitions in cadmium under pressure studied via theoretical and experimental x-ray absorption spectroscopy

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Electronic topological transitions in cadmium under pressure studied via theoretical and experimental x-ray absorption spectroscopy

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