Anisotropic Rashba coupling to polar modes in KTaO3

Abstract

Motivated by the discovery of superconductivity in KTaO3-based heterostructures, we study a pairing mechanism based on spin-orbit assisted coupling between the conduction electrons and the ferroelectric modes present in the material. We use ab initio frozen-phonon computations to show a linear-in-momentum Rashba-like coupling with a strong angular dependence in momentum for the lower j=3/2 manifold, deviating from the conventional isotropic Rashba model. This implies the Rashba-like interaction with the polar modes has substantial L=3 cubic harmonic corrections, which we quantify for each electronic band. The strong anisotropy of the Rashba interaction is captured by a microscopic toy model for the t2g electrons. We find its origin to be the angular dependence in electronic momentum imposed by the kinetic term on the degenerate j=3/2 manifold. A comparison between the toy model and ab initio results indicate that additional symmetry allowed terms beyond odd-parity spin-conserving inter-orbital hopping processes are needed to describe the Rashba-like polar interaction between the electrons and the soft ferroelectric mode.

Submitted to JPhys Materials for the Focus Issue on "Women's Perspectives in Quantum Materials"

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Cited by in corpus (5)

• Spontaneous rotational symmetry breaking in KTaO${}_3$ heterointerface superconductors
• Phonon-Induced Collective Modes in Spin-Orbit Coupled Polar Metals
• Spin-dependent anisotropic electron-phonon coupling in KTaO${}_3$
• Rashba splitting in polar-nonpolar sandwich heterostructure : A DFT Study
• Percolative Pathway to Stripe Order in KTaO3-Based Superconductivity