2019
DOI: 10.1063/1.5070059
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Femtosecond-laser-induced spin-polarized electron emission from a GaAs tip

Abstract: It is shown that focusing circularly-polarized 800 nm light pulses of 100 fs duration on the tips of p-GaAs crystalline shards having no negative electron affinity (NEA) activation results in electron emission that is both fast and spin-polarized. The 400 fs duration of the emission process was determined by pump/probe measurements. The three samples we investigated produced electron polarizations of 13.1(9) %, 13.3(7) %, and 10.4(2) %. Emission currents ranged between 50 pA and 3 nA with a sample bias of −100… Show more

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Cited by 8 publications
(1 citation statement)
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“…Various ultrafast laser-excited mechanisms may contribute to the electron emission process, including photofield emission (PFE), , optical field emission (OFE) ,, and multiphoton photoemission (MPP). In this study, the PFE can be excluded initially, because the photon energy (∼1.55 eV) of excitation laser corresponding to 800 nm in wavelength is considerably less than the work function (∼4.5 eV) of the vFLGs cathode. Figure a also reveals a nonfield-induced characteristic as the vacuum gap electric field provided by the anode is too small (below 0.8 MV m –1 ) to turn on the electrostatic field emission.…”
Section: Resultsmentioning
confidence: 99%
“…Various ultrafast laser-excited mechanisms may contribute to the electron emission process, including photofield emission (PFE), , optical field emission (OFE) ,, and multiphoton photoemission (MPP). In this study, the PFE can be excluded initially, because the photon energy (∼1.55 eV) of excitation laser corresponding to 800 nm in wavelength is considerably less than the work function (∼4.5 eV) of the vFLGs cathode. Figure a also reveals a nonfield-induced characteristic as the vacuum gap electric field provided by the anode is too small (below 0.8 MV m –1 ) to turn on the electrostatic field emission.…”
Section: Resultsmentioning
confidence: 99%