Promoted current-induced spin polarization in inversion symmetry broken topological insulator thin films
arXiv:2505.17294 · doi:10.1016/j.rinp.2025.108445
Abstract
We theoretically investigate current-induced spin polarization in disordered topological insulator thin films with broken inversion symmetry under an applied in-plane electric field. Utilizing the Kubo formalism within the self-consistent Born approximation and incorporating vertex corrections to account for multiple scattering events, we analyze how disorder, chemical potential, the electrostatic potential difference between the top and bottom surfaces, and momentum-dependent hybridization affect the spin susceptibility. Our results reveal that the spin susceptibility exhibits nonzero values within a finite range around a zero gap, and this range broadens as the chemical potential increases. A higher hybridization strength induces asymmetry in the spin response. A stronger potential difference, breaking inversion symmetry, significantly enhances polarization. This enhancement is a trend attributable to band inversion and is further refined by vertex corrections. These findings provide a theoretical framework for tuning spin-charge conversion in topological thin films, with implications for spintronic device applications.
35 pages, 10 figures
References in corpus (13)
- Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
- Quantum Spin Hall Insulator State in HgTe Quantum Wells
- A topological Dirac insulator in a quantum spin Hall phase : Experimental observation of first strong topological insulator
- Classification of topological insulators and superconductors in three spatial dimensions
- Quantized Anomalous Hall Effect in Magnetic Topological Insulators
- Introduction to topological superconductivity and Majorana fermions
- Current induced electron spin polarization in strained semiconductors
- Ordering of magnetic impurities and tunable electronic properties of topological insulators
- Charge and spin Hall conductivity in metallic graphene
- Electrically Controlled Spin Injection from Giant Rashba Spin-Orbit Conductor BiTeBr
- Spin-polarized tunneling current through a thin film of topological insulator in a parallel magnetic field
- Current-induced spin polarization at the surface of metallic films: a theorem and an ab initio calculation
- Current-induced spin polarization at metallic surfaces from first-principles