Investigating Quantum Spin-Textures Using Universal MJ Hamiltonians

TL;DR

This paper introduces two universal MJ spintronic Hamiltonians that accurately model complex spin textures in quantum materials, revealing new spin phenomena and offering a more versatile framework than previous models.

Contribution

The work presents novel universal MJ Hamiltonians for spin textures, improving upon existing models and providing new insights into spin phenomena in quantum materials.

Findings

H_MJ1 models persistent and partial spin textures

H_MJ2 depicts spiral spin textures linked to cosmological expansion

The models reveal complex spin phenomena due to spin-orbit coupling

Abstract

This work introduces a pair of novel universal MJ spintronic models that precisely mirror the complex spin textures observed in spintronic materials. The spin-orbit coupled (SOC) Hamiltonians H_MJ1 and H_MJ2 reveal a range of novel and intriguing spin phenomena by modulating spin-orbit interactions. The Hamiltonian H_MJ1 reshapes the existing paradigm, providing a more robust and versatile framework than the Hamiltonian H_RD, with the potential to catalyze new advancements in the study of quantum materials. H_MJ1 encapsulates two distinct spin textures: a unidirectional, momentum-independent persistent spin texture (PST), and a bidirectional (partial) PST. In contrast Hamiltonian H_MJ2 portrays a spiral spin texture, drawing a conceptual link to the cosmological process of expansion and contraction, mirrored within a two-dimensional quantum framework. We also explore the fundamental aspects of earlier analytical models that underpin the construction of the present MJ spintronic model. The physical interpretations of these models are illustrated graphically, and the emerging spin phenomena resulting from complex SOC are elucidated using a simple vector model.