论文标题
rbni $ _2 $ se $ _2 $的电子属性和表面状态
Electronic properties and surface states of RbNi$_2$Se$_2$
论文作者
论文摘要
基于铁的超导体，带有Thcr $ _ {2} $ si $ _ {2} $ - 型四方结构（122个家族），由于铁砷氧化铁/硒化层具有多种特征性电子特性。例如，与铁的$ d $ - 轨道和准二维（2D）圆柱式费米表面相关的多频道字符。此外，外部静水压力导致从四方到折叠相位相的同源相过渡。在本文中，与基于铁的超导体有关，我们讨论了新颖的122家族成员rbni $ _ {2} $ se $ _ {2} $ [Liu H.等，物理学的电子特性。修订版B 106，094511（2022）]。我们表明这两个费米口袋表现出准2D字符。 （001）表面的表面光谱函数的计算表明，表面状态是在表面终止上独立实现的。此外，与基于铁的122种化合物相反，rbni $ _ {2} $ se $ _ {2} $在压力下表现出非凡的多重等值结构过渡。此外，LIFSHIZT转变发生在外部压力下，导致对费米口袋形状的强烈修饰。
Iron-based superconductors, with the ThCr$_{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.
