Issue 10, 2022

Rashba spin splitting and anomalous spin textures in the bulk ferroelectric oxide perovskite KIO3

Abstract

The momentum-dependent Rashba and Dresselhaus spin splitting has gained much attention for its highly promising applications in spintronics. A non-centrosymmetric structure and the presence of spin–orbit coupling (SOC) lead to the momentum-dependent spin splitting of degenerate bands at non-time-reversal-invariant k-points. This lifts the Kramers degeneracy leading to Rashba and Dresselhaus splitting. In the search for new ferroelectric Rashba semiconductors, here we present ferroelectric oxide perovskite KIO3, where the presence of a heavy element (I), contributing to significant SOC and inversion asymmetric nature induces interesting band splitting. By employing the state-of-the-art density functional theory (DFT) with the semi-local and hybrid functional (HSE06) combined with SOC, we find non-negligible spin splitting effects at the conduction band minimum (CBm) and valence band maximum (VBM) for R3m and R3c phases. For a deeper understanding of the observed spin splitting, we have analyzed the spin textures within the combined framework of DFT and the k·p model Hamiltonian. Linear Rashba terms successfully explain splitting at the VBM. However, cubic terms become important in realizing spin-orientation near the CBm. In the R3c phase, the four-band k·p model Hamiltonian is needed to completely understand the anomalous nature of the spin textures, which is beyond the conventional linear Rashba and Dresselhaus splitting. Our results show the enhancement in Rashba parameters on tuning the epitaxial strain. Furthermore, we have observed a reversal of spin-orientation upon switching the direction of polarization.

Graphical abstract: Rashba spin splitting and anomalous spin textures in the bulk ferroelectric oxide perovskite KIO3

Supplementary files

Article information

Article type
Paper
Submitted
30 Sep 2021
Accepted
06 Mar 2022
First published
08 Mar 2022
This article is Open Access
Creative Commons BY-NC license

Mater. Adv., 2022,3, 4170-4178

Rashba spin splitting and anomalous spin textures in the bulk ferroelectric oxide perovskite KIO3

S. Sheoran, M. Kumar, P. Bhumla and S. Bhattacharya, Mater. Adv., 2022, 3, 4170 DOI: 10.1039/D1MA00912E

This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. You can use material from this article in other publications, without requesting further permission from the RSC, provided that the correct acknowledgement is given and it is not used for commercial purposes.

To request permission to reproduce material from this article in a commercial publication, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party commercial publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements