Transporting the Shape of Spin - From Spintronics to Multipoletronics

Explore the cutting-edge developments in spintronics and the emerging field of multipoletronics in this comprehensive lecture. Delve into the transport and manipulation of electron spin through electrical means, and examine the limitations of treating spin as a conserved quantity in materials with strong spintronic phenomena. Discover the concept of spin magnetic multipole moments and their gauge-invariant calculation for Bloch electrons using a wave-packet approach. Learn about the semiclassical Boltzmann theory for describing multipole moment transport, with monolayer phosphorene as a case study. Investigate the physical consequences of spin magnetic multipole moments, including current-induced spin accumulation and the spin Hall effect. Gain insights into ongoing research on the modern theory of equilibrium higher-order spin magnetic multipole moments, pushing the boundaries of our understanding in this exciting field.