Revealing the (111) surface electronic structure of epitaxially grown Na$_2$KSb photocathode
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arXiv
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| Autores principales: | , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| _version_ | 1866917521576165376 |
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| author | Solovova, N. Yu. Golyashov, V. A. Eremeev, S. V. Priobrazhenskii, S. Yu. Lebedev, S. P. Lebedev, A. A. Rusetsky, V. S. Tereshchenko, O. E. |
| author_facet | Solovova, N. Yu. Golyashov, V. A. Eremeev, S. V. Priobrazhenskii, S. Yu. Lebedev, S. P. Lebedev, A. A. Rusetsky, V. S. Tereshchenko, O. E. |
| contents | A recent study has established the Na$_2$KSb(Cs) photocathode as a highly efficient emitter of spin-polarized electrons. However, the electronic structure of alkali antimonides remains poorly understood. In this work, we report the first crystalline epitaxial growth of Na$_2$KSb films, achieved via chemical vapor deposition (CVD) on a graphene-coated SiC(0001) substrate. The high crystalline quality of these films enabled a direct investigation of the material's electronic structure using angle-resolved photoemission spectroscopy (ARPES). By comparing the experimental results with density functional theory (DFT) calculations, we have identified dispersive surface states originating from different terminations of the Na$_2$KSb(111) surface. Furthermore, we demonstrate that the crystalline order of the film is preserved following its activation via the deposition of Cs and Sb. This finding opens a pathway for investigating the electronic structure of multialkali Na$_2$KSb(Cs) photocathodes and for rationally improving their properties. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_19652 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Revealing the (111) surface electronic structure of epitaxially grown Na$_2$KSb photocathode Solovova, N. Yu. Golyashov, V. A. Eremeev, S. V. Priobrazhenskii, S. Yu. Lebedev, S. P. Lebedev, A. A. Rusetsky, V. S. Tereshchenko, O. E. Materials Science High Energy Physics - Experiment A recent study has established the Na$_2$KSb(Cs) photocathode as a highly efficient emitter of spin-polarized electrons. However, the electronic structure of alkali antimonides remains poorly understood. In this work, we report the first crystalline epitaxial growth of Na$_2$KSb films, achieved via chemical vapor deposition (CVD) on a graphene-coated SiC(0001) substrate. The high crystalline quality of these films enabled a direct investigation of the material's electronic structure using angle-resolved photoemission spectroscopy (ARPES). By comparing the experimental results with density functional theory (DFT) calculations, we have identified dispersive surface states originating from different terminations of the Na$_2$KSb(111) surface. Furthermore, we demonstrate that the crystalline order of the film is preserved following its activation via the deposition of Cs and Sb. This finding opens a pathway for investigating the electronic structure of multialkali Na$_2$KSb(Cs) photocathodes and for rationally improving their properties. |
| title | Revealing the (111) surface electronic structure of epitaxially grown Na$_2$KSb photocathode |
| topic | Materials Science High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2601.19652 |