Jul 16 – 18, 2025
Cornell University
America/New_York timezone

Investigating Dirac semimetal cadmium arsenide as a potential low-MTE photocathode

Not scheduled
20m
Phys Sci Bldg Rm 120 (Cornell University)

Phys Sci Bldg Rm 120

Cornell University

Speaker

Truman Idso (Arizona State University)

Description

We report on the quantum efficiency (QE) and mean transverse energy (MTE) of photoemitted electrons from cadmium arsenide $(\mathrm{Cd_3As_2})$, a three-dimensional Dirac semimetal (3D DSM) of interest for photocathode applications due to its unique electronic band structure, characterized by a 3D linear dispersion relation at the Fermi energy. Samples were synthesized at the National Renewable Energy Laboratory (NREL) and transferred under ultra-high vacuum to Arizona State University (ASU) for measurement using a photoemission electron microscope (PEEM). The maximum QE was measured to be $3.37\cdot10^{-4}$ at 230 nm, and the minimum MTE was 55.8 meV at 250 nm. These findings represent the first reported QE and MTE measurements of $\mathrm{Cd_3As_2}$ and are an important step in evaluating the viability of 3D DSMs as low-MTE photocathodes. Such photocathodes, constrained to lower MTEs by the electronic band structure, may prove effective in advancing beam brightness in next-generation instruments and techniques.

Primary author

Truman Idso (Arizona State University)

Co-authors

Anagha Ullattuparambil (Arizona State University) Mansoure Rizi (Arizona State University) Anthony Rice (National Renewable Energy Laboratory) Kirstin Alberi (National Renewable Energy Laboratory) Siddharth Karkare (Arizona State University)

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