Spin-Orbit Coupling in Halide Perovskite Systems

Spin–orbit coupling in halide perovskites arises from the interaction between the orbital motion of electrons and their intrinsic spin, driven by the presence of heavy elements such as lead and halide ions. This relativistic effect leads to band splitting and spin–momentum locking, with Rashba and Dresselhaus phenomena emerging under broken inversion symmetry. The consequent modulation of band structure influences charge carrier dynamics, exciton behaviour and spin lifetimes. Structural motifs—ranging from bulk single crystals to layered two-dimensional quantum wells—exhibit varying degrees of symmetry breaking, generating static or dynamic spin textures. These textures underpin novel optoelectronic responses, including circular photogalvanic effects, spin-polarised photocurrents and magneto-optical phenomena. Recent advances in both experimental spectroscopy and first-principles theory have clarified dominant spin-relaxation pathways, g-factor anisotropies and the tuning of spin lifetimes by temperature, field and composition. Together, these insights highlight halide perovskites as a versatile platform for spintronics, quantum information and efficient optoelectronic devices, where spin and charge degrees of freedom can be manipulated optically or electrically without external magnetic bias.

Research from Nature Portfolio

Recent studies have demonstrated that structural disorder in polycrystalline thin films can drive local inversion symmetry breaking, leading to the ultrafast formation of micrometre-scale spin domains. Using femtosecond circular-polarisation-resolved microscopy, researchers have observed Rashba-like spin textures and lateral spin currents that accumulate spin on sub-picosecond timescales, offering a route to optically addressable spintronic elements in solution-processed films. In parallel, first-principles investigations into intrinsic spin lifetimes in prototype perovskites have established upper bounds for spin relaxation (T1) and dephasing times (T2*). By incorporating Landé g-factors and evaluating interactions such as the Fröhlich coupling, these calculations reveal temperature, field and carrier-density dependencies of spin decoherence, identifying dominant relaxation channels and guiding strategies to optimise spin transport in lead halide frameworks.

Spin-Orbit Coupling in Halide Perovskite Systems publication trend

The graph below shows the total number of articles in spin-orbit coupling in halide perovskite systems across all publications each year (not limited to Nature Index journals).

Technical terms

Spin–orbit coupling: A relativistic interaction between an electron’s motion and its spin, leading to energy band splitting in materials with heavy elements.

Rashba splitting: The momentum-dependent separation of spin bands induced by broken inversion symmetry and strong spin–orbit coupling.

Exciton: A bound state of an electron and a hole attracted by electrostatic Coulomb interaction in a semiconductor.

Spin relaxation time (T1): The timescale over which a non-equilibrium spin population returns to thermal equilibrium.

Spin dephasing time (T2*): The timescale over which a coherent ensemble of spins loses phase coherence due to inhomogeneities and interactions.

References

1. Local symmetry breaking drives picosecond spin domain formation in polycrystalline halide perovskite films. Nature Materials (2023).
2. How spin relaxes and dephases in bulk halide perovskites. Nature Communications (2024).
3. Highly‐Polarized Emission Provided by Giant Optical Orientation of Exciton Spins in Lead Halide Perovskite Crystals. Advanced Science (2024).
4. Indirect to direct bandgap transition in methylammonium lead halide perovskite. Energy & Environmental Science (2017).