Title: Topological insulators for the generation of electron beams

Journal Article · · Applied Physics Letters
DOI: https://doi.org/10.1063/1.5052415 · OSTI ID:1484887
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  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
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Measurements of photo-yields from various topological insulators (TIs) in ultra-high vacuum were made. Marked differences in the photoelectric yield were found between the freshly in-vacuum cleaved and the atmosphere cleaved TI samples. The spectral dependence of their quantum efficiency (QE) was obtained in as-cleaved and cesiated TI samples. Inferred work functions ranging from 5 to 5.5 eV were found in all TI samples before cesiation, and they were lowered by ~0.5 eV after cesiation. At the ultraviolet wavelength of 268 nm, the QE of all samples is ~2 × 10-7 before cesiation but improved to 10-4–10-3 after cesiation. In conclusion, knowledge of the QE has practical implication and can serve as a useful guide for the development of a spin-polarized electron source. However, the spin polarized nature of the photo-emitted electron remains yet to be explored.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Grant/Contract Number:
AC02-98CH10886; SC0012704
OSTI ID:
1484887
Report Number(s):
BNL-209656-2018-JAAM; BNL-209669-2018-JAAM
Journal Information:
Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 23 Vol. 113; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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