Spectral Detection of Spin-Polarized Ultra Low-Energy Electrons in Semiconductor Heterostructures Научная публикация
| Журнал |
Ultramicroscopy
ISSN: 0304-3991 , E-ISSN: 1879-2723 |
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| Вых. Данные | Год: 2020, Том: 218, Номер статьи : 113076, Страниц : 8 DOI: 10.1016/j.ultramic.2020.113076 | ||||||
| Ключевые слова | Angle-resolved photoemission spectroscopy; Circularly polarized cathodoluminescence; Electron spin polarization; Negative electron affinity; Spin-detector | ||||||
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| Организации |
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Реферат:
The circularly polarized cathodoluminescence (CL) technique has been used to study the free spin-polarized electron injection in semiconductor heterostructures with quantum wells (QWs). A polarized electron beam was created by the emission of optically oriented electrons from the p-GaAs(Cs,O) negative electron affinity (NEA) photocathode. The prepared beam was injected in a semiconductor QW target, which was activated by cesium and oxygen to reduce the work function. To study the spin-dependent injection, we developed a spin-detector prototype, which consists of a compact proximity focused vacuum tube with the source and target placed parallel to each other on the opposite ends of the vacuum tube (photodiode). The injection of polarized low-energy electrons into the target by varying the kinetic energy in the range of 0.5-5.0 eV and temperature in the range of 90-300 K was studied. The CL was polarized to 2 % by the injection of 20 % spin-polarized electron beam with the energy of 0.5 eV at room temperature. The asymmetry (Sherman function) of spin detection was estimated. It was shown that the dependence of the CL polarization degree on the injected electron energy is satisfactory described by the model that considers the electron spin relaxation in the heterostructure matrix and QWs. The results demonstrate that semiconductor detectors are promising for the spin-polarimetry applications based on the optical detection of free-electron spin polarization.
Библиографическая ссылка:
Golyashov V.A.
, Rusetsky V.S.
, Shamirzaev T.S.
, Dmitriev D.V.
, Kislykh N.V.
, Mironov A.V.
, Aksenov V.V.
, Tereshchenko O.E.
Spectral Detection of Spin-Polarized Ultra Low-Energy Electrons in Semiconductor Heterostructures
Ultramicroscopy. 2020. V.218. 113076 :1-8. DOI: 10.1016/j.ultramic.2020.113076 WOS Scopus CAPlusCA PMID OpenAlex
Spectral Detection of Spin-Polarized Ultra Low-Energy Electrons in Semiconductor Heterostructures
Ultramicroscopy. 2020. V.218. 113076 :1-8. DOI: 10.1016/j.ultramic.2020.113076 WOS Scopus CAPlusCA PMID OpenAlex
Даты:
| Поступила в редакцию: | 1 апр. 2020 г. |
| Принята к публикации: | 11 июл. 2020 г. |
| Опубликована online: | 17 июл. 2020 г. |
| Опубликована в печати: | 1 нояб. 2020 г. |
Идентификаторы БД:
| Web of science: | WOS:000588015200003 |
| Scopus: | 2-s2.0-85088844518 |
| Chemical Abstracts: | 2020:1485285 |
| Chemical Abstracts (print): | 175:305568 |
| PMID (PubMed): | 32738565 |
| OpenAlex: | W3042497154 |