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@inproceedings{poddar:ipac2021-wepab102,
author = {S. Poddar and C.-J. Jing and P. Lukashev and E.J. Montgomery and C. Palmstrøm and M.L. Stutzman and S. Zhang},
% author = {S. Poddar and C.-J. Jing and P. Lukashev and E.J. Montgomery and C. Palmstrøm and M.L. Stutzman and others},
% author = {S. Poddar and others},
title = {{Half-Metal Spin Filter for Highly Polarized Emission from GaAs Photocathodes}},
booktitle = {Proc. IPAC'21},
pages = {2833--2836},
eid = {WEPAB102},
language = {english},
keywords = {electron, polarization, cathode, lattice, hardware},
venue = {Campinas, SP, Brazil},
series = {International Particle Accelerator Conference},
number = {12},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {08},
year = {2021},
issn = {2673-5490},
isbn = {978-3-95450-214-1},
doi = {10.18429/JACoW-IPAC2021-WEPAB102},
url = {https://jacow.org/ipac2021/papers/wepab102.pdf},
note = {https://doi.org/10.18429/JACoW-IPAC2021-WEPAB102},
abstract = {{GaAs-based photocathodes are one of the major sources of spin-polarized electrons and are crucial for the upcoming Electron-Ion collider experiments which includes study of proton spin and spin parity violation in the standard model. The theoretical polarization limit in unstrained GaAs photocathodes is 50 % but only 35 % is routinely achieved in experiments. Spin selective filtering allows to boost the spin polarization beyond the 50 % theoretical limit. In this work, first-principle electronic calculations using standard Density Functional Theory are performed to predict possible Heusler alloy half-metal candidates to be used as spin-filter. Simulations are also performed to investigate the half-metallicity as function of the magnetic spin direction. Several devices are experimentally fabricated using dedicated Molecular Beam Epitaxy growth system. We implemented Quantum Efficiency and Polarization testing of these half-metal/GaAs heterostructures using a dedicated Mott polarimeter system. Photoemission can also be seen on magnetically switching the spin-filter direction accompanied by a change in sign of the asymmetry which is a qualitative proof of the spin-filtering effect.}},
}