Photoemission study of the electronic structure and charge density waves of Na(2)Ti(2)Sb(2)O

The electronic structure of Na(2)Ti(2)Sb(2)O single crystal is studied by photon energy and polarization dependent angle-resolved photoemission spectroscopy (ARPES). The obtained band structure and Fermi surface agree well with the band structure calculation of Na(2)Ti(2)Sb(2)O in the non-magnetic s...

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Detalles Bibliográficos
Autores principales: Tan, S. Y., Jiang, J., Ye, Z. R., Niu, X. H., Song, Y., Zhang, C. L., Dai, P. C., Xie, B. P., Lai, X. C., Feng, D. L.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2015
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5386208/
https://www.ncbi.nlm.nih.gov/pubmed/25927621
http://dx.doi.org/10.1038/srep09515
Descripción
Sumario:The electronic structure of Na(2)Ti(2)Sb(2)O single crystal is studied by photon energy and polarization dependent angle-resolved photoemission spectroscopy (ARPES). The obtained band structure and Fermi surface agree well with the band structure calculation of Na(2)Ti(2)Sb(2)O in the non-magnetic state, which indicates that there is no magnetic order in Na(2)Ti(2)Sb(2)O and the electronic correlation is weak. Polarization dependent ARPES results suggest the multi-band and multi-orbital nature of Na(2)Ti(2)Sb(2)O. Photon energy dependent ARPES results suggest that the electronic structure of Na(2)Ti(2)Sb(2)O is rather two-dimensional. Moreover, we find a density wave energy gap forms below the transition temperature and reaches 65 meV at 7 K, indicating that Na(2)Ti(2)Sb(2)O is likely a weakly correlated CDW material in the strong electron-phonon interaction regime.

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