Electronic properties and surface states of RbNi$_2$Se$_2$

Surajit Basak; Przemysław Piekarz; Andrzej Ptok

doi:10.1016/j.physb.2023.414697

paper

Electronic properties and surface states of RbNi $_{2}$ Se $_{2}$

arXiv:2210.13280 · doi:10.1016/j.physb.2023.414697

Abstract

Iron-based superconductors, with the ThCr $_{2}$ Si $_{2}$ -type tetragonal structure (122 family), due to the iron arsenide/selenide layers exhibit several characteristic electronic properties. For example, multiband character mosty associated with the $d$ -orbitals of iron and the quasi-two-dimensional (2D) cylindrical Fermi surface. Moreover, external hydrostatic pressure leads to the isostructural phase transition from the tetragonal to collapsed-tetragonal phase. In this paper, in relation to the iron-based superconductors, we discuss the electronic properties of novel 122-family member RbNi $_{2}$ Se $_{2}$ [Liu H. et al., Phys. Rev. B 106, 094511 (2022)]. We show that the two Fermi pockets exhibit quasi-2D character. Calculation of the surface spectral function for the (001) surface shows that the surface states are realized independently on the surface termination. Additionally, contrary to the iron-based 122 compounds, RbNi $_{2}$ Se $_{2}$ exhibits extraordinary multiple isostructural phase transitions under pressure. Moreover, the Lifshizt transition occurs under external pressure, which results into a strong modification of the shapes of the Fermi pockets.

arXiv comment12 pages, 8 figures

Electronic properties and surface states of RbNi2​Se2​

Abstract

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Electronic properties and surface states of RbNi $_{2}$ Se $_{2}$